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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Korean Journal of Agricultural Science
Journal Basic Information
Journal DOI :
CNU Journal of Agricultural Science
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Volume & Issues
Volume 42, Issue 4 - Dec 2015
Volume 42, Issue 3 - Sep 2015
Volume 42, Issue 2 - Jun 2015
Volume 42, Issue 1 - Mar 2015
Selecting the target year
Effects of feeding leaf positions on the growth and fruit quality in muskmelon plants showing leaf yellowing symptoms
Lee, Hee-Ju ; Lee, Sang-Gyu ; Park, Sung-Tae ; Kim, Sung-Kyeom ; Choi, Chang-Sun ; Chun, Chang-Hoo ;
Korean Journal of Agricultural Science, volume 42, issue 4, 2015, Pages 293~297
DOI : 10.7744/cnujas.2015.42.4.293
This study was conducted to evaluate the influence of feeding leaf positions on the growth, net formation of fruits, and occurrence of leaf yellowing symptoms (LYS) in muskmelon plants. Plants having five or ten more leaves above the fruit-bearing node produced the greater biomass than those of plants having equal or five less leaves above the fruit-bearing node. The number of leaves above the fruit-bearing node also influenced on the occurrence of LYS. The number of plants with LYS decreased as the number of leaves borne on the nodes above the fruit-bearing node increased. The LYS infected ratio of BL-5 treatment were the greatest, while fruit weight of BL+5 treatment were the greatest among all the tested treatments. In addition, the net formation of BL-5 treatment showed the poorest. Results indicated that maintaining the higher number of leaves over the fruit-bearing node might be feasible the practical method for coping physiological damages from yellowing symptoms.
Growth characteristics of 2-year-old cultivars in Korean ginseng (Panax ginseng C. A. Meyer) conditioned artificial wet injury
Kim, Jang-Uk ; Lee, Jung-Woo ; Jo, Ick-Hyun ; Kim, Dong-Hwi ; Kim, Kee-Hong ; Kim, Young-Chang ;
Korean Journal of Agricultural Science, volume 42, issue 4, 2015, Pages 299~304
DOI : 10.7744/cnujas.2015.42.4.299
This study was conducted to investigate growth characteristics to develop the technique to select resistant cultivar by wet injury at an early stage through the automatic irrigation maintaining 30, 20, 10 kPa respectively using native variety, Chunpoong, Yunpoong, Gumpoong and Sunun. The aerial growth was decreased at 10 kPa compared to 30 kPa. In addition, the survival rate was decreased by 66.6%, 62.3%, 33.8% at 30, 20, 10 kPa, respectively. The survival rate of Chunpoong and Gumpoong were higher than others at 10 kPa. While root growth characteristics such as root length, root weight, number of lateral root and side root were tended to decrease, root diam was no significant or increased. And the more humid condition is, the more the incidence rate of rusty root and rough skin were tended to increase. The epidermal thickness of Chunpoong and Gumpoong was increased but the figures of native variety, Yunpoong and Sunun were decreased at 10 kPa compared to 30 kPa. But, the tissue stiffness of root was decreased at 10 kPa compared to 30 kPa.
Yield change of seed bulb according to annual field culture after induced meristem culture in garlic (Allium sativum L.)
Kwon, Young-Seok ; Choi, In-Hu ; Kim, Cheol-Woo ; Choi, Min-Seon ; Kwak, Jung-Ho ; Lim, Yong-Pyo ;
Korean Journal of Agricultural Science, volume 42, issue 4, 2015, Pages 305~311
DOI : 10.7744/cnujas.2015.42.4.305
In this research, we surveyed the yield change of garlic cultivation with seed bulbs according to annual field culture after induced meristem culture. From 2007 to 2013, yearly produced seed bulbs from
generation were cultivated in the Muan field. Over the generations, the general growth characteristics such as the plant height, leaf number, leaf length and stem diameter were all decreased. When we compared the conventional seed bulbs and TCR ones, the plant height and stem diameter showed bigger difference. And the TCR seed bulbs showed a week late harvest time against the conventional ones. The yield of
generation was 72.3 g and 57.1 g for the
generation. However every generation showed higher yield than conventional seed garlic`s ones as 43.9 g. The yield index showed the same trend as
to 63% to 21%. After the tissue culture of garlics, the viral infections (OYDV and GSV) of TCR was far less than that of conventional ones. In case of LYSV, the infection ratio was 6.7% at
generation and 26% at
. However, the ratio was far less than that (80%) of the conventional ones.
Effects of planting date for the prevention of frost-pillar damage and replanting of damaged plant on onion (Allium cepa L.)
Kwon, Young-Seok ; Choi, In-Hu ; Kim, Cheol-Woo ; Choi, Min-Seon ; Kwak, Jung-Ho ; Lim, Yong-Pyo ;
Korean Journal of Agricultural Science, volume 42, issue 4, 2015, Pages 313~318
DOI : 10.7744/cnujas.2015.42.4.313
In the year 2013, onions cultivation in Jeonnam province suffered by frost-pillar damage. To reveal the aspects of the cause and outbreak, we surveyed those damaged areas. Usually the frost-pillar damage occurred in February. But the outbreak aspect is so unforeseeable. In 2013, the damage was shown as 10.6% in onion fields including paddy fields, but no damage was noticed in 2014. The damage was noticed as 77.8% in paddy fields and 30.1% in upland. And, by the difference of the onion transplanting date, it occurred as 0.7% by the middle of November to the early of November, 22% by the middle of November and 69.0% by the early of December. If one performed the supplementary planting at
week of February, the highest survival percent was observed as 53.3%. If the date is early, another frost-pillar damage was occurred. If it`s late, the damaged plant was perished with dry. In any case, we found improper transplanting caused the yield decrease. Therefore, we recommend the timely transplanting is the most important way for the prevention of frost-pillar damage in the onion cultivation.
Estimation of growth stage-based nitrogen supply levels for greenhouse semi-forcing zucchini cultivation
Ha, Sang-Keun ; Sonn, Yeon-Kyu ; Jung, Kang-Ho ; Lee, Ye-Jin ; Cho, Min-Ji ; Yun, Hye-Jin ; Sung, Jwa-Kyung ;
Korean Journal of Agricultural Science, volume 42, issue 4, 2015, Pages 319~324
DOI : 10.7744/cnujas.2015.42.4.319
An estimation of the requirement of minerals based on growth stage and cropping pattern is very important for greenhouse zucchini. This study was performed at farmer`s field which was applied with a fertigation system and a semi-forcing cultivation from Feb. to July in 2014, and nitrogen levels were set up with x0.5, x0.75, x1.0 and x1.5 of the NO3-N-based soil-testing recommendation for zucchini cultivation. Top dressing of nitrogen (basal : top
Effects of ventilation systems and set point temperature of single-span plastic greenhouse on disease incidence, fruit quality and yield of oriental melon (Cucumis melo L.)
Yeo, Kyung-Hwan ; Yu, In-Ho ; Rhee, Han-Cheol ; Choi, Gyeong-Lee ; Lee, Seong-Chan ; Lee, Jung-Sup ;
Korean Journal of Agricultural Science, volume 42, issue 4, 2015, Pages 325~333
DOI : 10.7744/cnujas.2015.42.4.325
The ventilation systems composed three types of side vent (roll-up) `SV`, side vent+roof vent `SV+RV`, and side vent+roof fan `SV+RF` with 7.5 m spacing, with specific set point temperatures for ventilation: SV (
close), SV+RV or SV+RH (
close for root ventilation and
close for side vent). In the treatment of SV+RV, although the average daily maximum temperature inside the greenhouse temporarily increased by
, thermal stress by high temperature did not occur and the disease incidence (%) of powdery mildew and downy mildew on the oriental melon were 25 - 75% lower than in the conventional SV treatment. In the SV treatment, the disease incidence (%) of powdery mildew and downy mildew were 1.4 - 7.7% and 4.2 - 15.9% for `Deabakkul`, and 20.3 - 22.8% and 2.8 - 11.3%, for `Ildeungkkul`. The yield for one month was higher in the treatment of SV+RV than those in other treatments, with values of 2,105 kg/10a for `Deabakkul` and 2,537 kg/10a for `Ildeungkkul`. The simultaneous treatment with side vent and roof vent resulted in 16.2% higher yield (18.1% higher marketable yield) than that in the SV treatment for `Deabakkul`.
Report on the 54th annual meeting of the weed science society of Japan
Hwang, Jae-Bok ; Kim, Kyung-Hyun ;
Korean Journal of Agricultural Science, volume 42, issue 4, 2015, Pages 335~339
DOI : 10.7744/cnujas.2015.42.4.335
This paper reviews current status of weed science in Japanese regional agricultural systems based on the 54th Annual Meeting of the Weed Science Society of Japan. About 300 researchers from 5 countries including Korea participated in the Conference and presented 100 papers in research areas. This congress has an purpose to discuss new troubles, findings and results of weed science. Weed science faces big challenges such as increase in herbicide-resistant weeds, gene-flow from transgenic crops, and invasive weeds. Major research topics were invasive weeds and their ecology, allelopathy, weed management in paddy field, weed management in field crops, and herbicide resistance. Weed control and herbicide resistance management in paddy field were a main object of research. To prevent the increase of problematic weeds and to overcome food crisis, the importance of weed-related researches has been raised. Therefore it is expected that various weed management systems and control of herbicide resistant weeds should be studied continuously in the weed science.
Preference analysis of administrator group for public forest road use (I) - Problems of forest road use and standards and suggestions for future improvement -
Ji, Byoung-Yun ; Hwang, Jin-Seong ; Jung, Do-Hyun ; Kweon, Hyeong-keun ;
Korean Journal of Agricultural Science, volume 42, issue 4, 2015, Pages 341~346
DOI : 10.7744/cnujas.2015.42.4.341
This study was conducted to investigate the awareness tendency of the government employees who manage forest roads about problems of forest road use and how to improve them in the future using surveys. The results show there are more silvicultural operations than harvesting operations using forest roads. The main purpose of using forest roads is to transport workers; however, the road will be used more for harvesting operations in the future. The respondents wanted to be accessibility for forest operations within 200 m from road in both present and future. For silvicultural operations 1-ton vehicle is used at present, and 5-ton vehicles are expected to be used in the future. For harvesting operations 5-ton vehicle is used at present, and 10-ton vehicles are will be used in the future. The roadway width is 3 - 4 m at present, but should be 4 - 4.5 m in the future. The longitudinal gradient of roads is 7 - 10% at present, and will be below 10% in the future. The minimum curve radius of roads is 12 - 15 m at present, and will be 15 - 20 m in the future. The results provide basic data for making future forest road policies.
Effect of dietary supplementation of tapioca on growth performance and meat quality in pigs
Park, Jae-Won ; Cui, Jing-Ai ; Lee, Sang-In ; Kim, Young-Hwa ; Park, Joon-Cheol ; Chae, Byung-Jo ; Kim, In-Ho ;
Korean Journal of Agricultural Science, volume 42, issue 4, 2015, Pages 347~354
DOI : 10.7744/cnujas.2015.42.4.347
This study evaluated whether dietary supplementation of tapioca could alleviate the negative effects of palm kernel meal (PKM) on growth performance and meat quality in growing and finishing pigs. In experiment 1, 120 73-dold crossbred growing pigs [
], with an average body weight of
, were used in a 3-week trial. In experiment 2, 120 108-d-old crossbred finishing pigs [
], with an average BW of
were used in a 10-week trial. Treatments were: CON, a corn-soybean meal-based diet; PKM, 8% PKM, and TPKM, 8% PKM and 10% tapioca. No difference was observed in growth performance or meat quality among treatments in growing pigs. In finishing pigs, no difference was observed in growth performance or meat quality among CON and TPKM dietary treatments. Finishing pigs fed PKM decreases in final BW and ADG compared with those fed CON. Meat quality was not affected by dietary treatments. In conclusion, dietary supplementation of tapioca alleviated anti-nutritional effect of PKM on growth performance in growing and finishing pigs. Thus, the PKM with tapioca could be an available alternative energy source to reduce the cost of pig diets.
Effect of microorganisms collected from uterus of Hanwoo cattle with low conception rate on the development of IVF-derived embryos
Woo, Jae-Seok ; Kim, Ki-Hyun ; Cho, Eun-Seok ; Yeon, Seong-Heum ; Park, Youn-Bae ; Kim, Min-Kyu ; Sa, Soo-Jin ;
Korean Journal of Agricultural Science, volume 42, issue 4, 2015, Pages 355~359
DOI : 10.7744/cnujas.2015.42.4.355
The cause of infertility is either fertilization failure or early embryonic death. The aetiology may involve a combination of many factors, e.g. genetic factors, abnormalities in the gametes nutritional disorders, inadequate luteal function, and delayed ovulation. This study was conducted to investigate the effect of microorganisms collected from uterus of Hanwoo cattle on early embryonic development. Microorganisms isolated from the uterus of Hanwoo cattle included Bacillus cereus (Bc), Bacillus thuringiensis (Bt), Staphylococcus warneri (Sw) and Enterococcus faecalis (Ef). When cultured with Bc, Bt, Sw, and Ef, oocytes were not developed into a blastocyst in vitro. The proportion of blastocyst was dramatically increased after reducing the number of microorganisms (
). Interestingly, the proportion of blastocyst was decreased by adding the Sw and Ef. These results indicate that among intrauterine microorganisms, Sw and Ef strains negatively affect theearly embryonic development, thereby aggravate the rates of implantation and pregnancy. These findings will provide useful information for association studies in other pig populations.
Effects of high energy diet on growth performance, carcass characteristics, and blood constituents of Hanwoo steers distributed by estimated breeding value for meat quality
Chung, Ki-Yong ; Lee, Sung- Hwan ; Chang, Sun-Sik ; Lee, Eun-Mi ; Kim, Hyun-Joo ; Park, Bo-Hye ; Kwon, Eung-Ki ;
Korean Journal of Agricultural Science, volume 42, issue 4, 2015, Pages 361~368
DOI : 10.7744/cnujas.2015.42.4.361
This study was to investigate the effect of high energy diet on characteristics of Hanwoo steers distributed by estimated breeding value (EBV). The aim of this experiment was to determine the effect of high energy diet on the high and low beef group distributed by EBV for quality grades. We hypothesized that high energy diet is able to increase quality traits in high EBV groups when fed a high energy diet. A
factorial arrangement (High energy, control vs high EBV, low EBV) in a completely random design was used to feed 26 Hanwoo steers. Blood was drawn from each steers from 11 to 28 months. ADG and feed efficiency were not different between high energy and control diet (P>0.05). The level of DMI was greater at calf and early fattening diet in low EBV groups (P<0.05). Serum glucose and tryglyceride conecntrations were increased (P<0.05) by high EBV group from 22 to 28 month old. Serum NEFA concentration were plateau at 24 months at high EBV group and steady reduced by high energy diet (P<0.05). This data indicated that high energy diets increased serum glucose and triglyceride concentrations of high EBV steers at final fattening period.
Comparison of glucose, lactate, and nucleotide degradation products content of cooked Hanwoo and Australian beef steaks by internal temperature
Kang, Sun-Moon ; Kang, Geun-Ho ; Seong, Pil-Nam ; Kim, Young-Chun ; Kim, Jin-Hyoung ; Ba, Hoa Van ; Jang, Seon-Sik ; Cho, Soo-Hyun ;
Korean Journal of Agricultural Science, volume 42, issue 4, 2015, Pages 369~374
DOI : 10.7744/cnujas.2015.42.4.369
This study was conducted to compare the glucose, lactate, and nucleotide degradation products content of cooked beef steaks from Korean Hanwoo (quality grade: 1) and Australian cattle (Bos indicus, grain-fed for 100 d) by internal temperature. The loins (M. longissimus dorsi) and top rounds (M. semimembranosus) from two cattle breeds were cut into about 2 cm thickness and then cooked in a
electronic oven until internal temperature attained to 50, 70, or
. Regardless of internal temperature, glucose content was higher (P<0.05) in cooked loin and top round steaks from Hanwoo compared to those from Australian cattle. Lactate content was shown to be lower (P<0.05) in cooked steaks from Hanwoo than in those from Australian cattle. Lower (P<0.05) hypoxanthine and higher (P<0.05) guanosine 5`-monophosphate, inosine 5`-monophosphate, inosine contents were observed in cooked steaks from Hanwoo. Furthermore, glucose content tended to be decreased by internal temperature but nucleotide degradation products content was not changed by internal temperature. Therefore, these findings suggest that cooked Hanwoo beef steaks had higher flavor precursors related to sweet and umami tastes than cooked Australian beef steaks
Effects of fermented milk substituted for creep feed on growth performance, diarrhea score and blood profiles in lactating piglets
Kim, Seung Cheol ; Kim, Hyun-Soo ; Heo, Jung-Min ; Kim, In-Ho ;
Korean Journal of Agricultural Science, volume 42, issue 4, 2015, Pages 375~382
DOI : 10.7744/cnujas.2015.42.4.375
In the present study, offsprings of 14 sows were used to evaluate the effect of fermented milk substituted for creep feed to analyze its effect on growth performance, diarrhea score and blood profiles. The piglets of sows were randomly allocated into 1 of 2 treatments (1 treatment separated piglets of 7 sows). The dietary treatments includes: CF (creep feed) and FM (fermented milk). The CP and FM diets were given from 3 d after piglets were born to the day of weaning (21 d after piglets were born). No significant difference (P>0.05) were observed in number of born piglets, weaning pigs, survival rate, body weight of piglets at d 0, 7, 14, and 21, ADG and ADFI. At d 21, piglets fed with CP had a higher (P<0.05) IgG compared with piglets fed with FM. No significant difference (P>0.05) was observed in WBC among the treatments at d 21. At d 6, piglets fed with CP had a lower (P<0.05) number of diarrhea piglets compared to piglets fed with FM. In conclusion, FM substituted for CP had no adverse effect on growth performance in lactating piglets.
Effects of supplementation of hairy vetch on the quality of whole crop barley silage
Jang, Won-Sup ; Yang, Byung-Mo ; Heo, Jung-Min ; Lee, Hyung-Suk ; Lee, Soo-Kee ;
Korean Journal of Agricultural Science, volume 42, issue 4, 2015, Pages 383~388
DOI : 10.7744/cnujas.2015.42.4.383
This study was conducted to investigate the effects of hairy vetch supplementation on quality of winter crop silage. There were 4 treatments (addition levels of hairy vetch ; 0, 5, 15, and 30%) with 3 replicates. Experimental silages stored for 40 days at room temperature (
). THe silage crude protein level was improved (P<0.05) while hairy vetch supplementation increased. However, no difference was found (P>0.05) in crude fat, NDF and ADF of the silage while hairy vetch supplementation increased. The silage pH was increased (P<0.05) but lactic acid level was decreased (P<0.05) while hairy vetch supplementation increased. Nonetheless, acetic and butyric acids concentrations were increased (P<0.05) while hairy vetch supplementation increased. Sucrose, glucose and fructose levels were increased (P<0.05) while hairy vetch supplementation increased. Although negative effects were detected in whole crop barley silage while hairy vetch supplementation increased, optimum level of hairy vetch supplementation could be overwhelmed its negative effects on whole crop barley silage. Thus, the results of present study suggested that 15% hairy vetch supplementation of whole crop barley silage would be beneficial its quality maintenance compared to whole crop barley silage per se.
Investigation of industries`s perception on the ban of antibiotics growth promoter in commercial mixed feed
Kim, Ki-Hyun ; Kim, Kwang-Sik ; Kim, Jo-Eun ; Seol, Kuk-Hwan ; Kim, Young-Hwa ;
Korean Journal of Agricultural Science, volume 42, issue 4, 2015, Pages 389~396
DOI : 10.7744/cnujas.2015.42.4.389
This study was performed to investigate the opinions of various related-industries on ban of antibiotics growth promoters (AGPs) in commercial mixed feed. The answers on a total of 21 questions were summarized by response number and percentage. 93% of those surveyed were in agreement of a ban of dietary AGPs. The agreement reasons were the livestock safety (61.5%), the reduction of antibiotic use (23.1%), and decrease of antibiotic-resistant bacteria (11.5%). The negative effects expected by the ban of AGPs were poor growth performance (44.2%), elevated disease emergence (31.4%), increasing the feed cost (18.6%), and quality degradation of livestock (5.8%). As the efficient plans for decline of AGPs use, the feeding environment improvement was the highest with 43%, and farmer training and the consolidation inspection of residual substance on antibiotics in livestock product was 27.9% and 22.1%, respectively. 46.5% of respondent are considering the modification of feed spec and 39.5% of those surveyed have staged a modified feed spec. In conclusion, livestock related-industries approve a ban of AGPs, and they assert that the policy support, improvement of management and environment in the farm, providing technology from related-industries are multiply essential for a stable settlement of a ban policy of AGPs.
Implementation of genomic selection in Hanwoo breeding program
Lee, Seung Hwan ; Cho, Yong Min ; Lee, Jun Heon ; Oh, Seong Jong ;
Korean Journal of Agricultural Science, volume 42, issue 4, 2015, Pages 397~406
DOI : 10.7744/cnujas.2015.42.3.397
Quantitative traits are mostly controlled by a large number of genes. Some of these genes tend to have a large effect on quantitative traits in cattle and are known as major genes primarily located at quantitative trait loci (QTL). The genetic merit of animals can be estimated by genomic selection, which uses genome-wide SNP panels and statistical methods that capture the effects of large numbers of SNPs simultaneously. In practice, the accuracy of genomic predictions will depend on the size and structure of reference and training population, the effective population size, the density of marker and the genetic architecture of the traits such as number of loci affecting the traits and distribution of their effects. In this review, we focus on the structure of Hanwoo reference and training population in terms of accuracy of genomic prediction and we then discuss of genetic architecture of intramuscular fat(IMF) and marbling score(MS) to estimate genomic breeding value in real small size of reference population.
Protective effects of Seoritae Chungkukjang added with green tea powder against 3-morpholinosydnonimine-induced oxidative stress
Cho, Eun-Ju ; Park, Hyun-Young ; Lee, Sang-Hyun ; Kim, Hyun-Young ;
Korean Journal of Agricultural Science, volume 42, issue 4, 2015, Pages 407~414
DOI : 10.7744/cnujas.2015.42.4.407
To increase antioxidative activity of Chungkukjang, the protective effect of Seoritae Chungkukjang (SC) added with green tea powder against oxidative stress was evaluated under the cellular system using LLC-
cells. The treatment of 3-morpholinosydnonimine showed increase in lipid peroxidation, and decrease in endogenous anti-oxidant enzymes activity and cell viability. The methanol extract of SC inhibited lipid peroxidation by 70.9%, and significantly increased cell viability up to more than 33.2%. In addition, it enhanced superoxide dismutase (SOD) and glutathione peroxidase (GSH-Px) activities. Particularly, the addition of green tea in SC exerted protective effect against oxidative stress by ONOO- through elevation in activities of SOD and GSH-Px, and inhibition of lipid peroxidation. More addition of green tea showed stronger protective activity. These results suggest that the addition of green tea to SC leads to the increase in the antioxidative effect of Chungkukjang through elevation in antioxidative enzyme activities and protection from lipid peroxidation.
Influence of the lime on inorganic ion and glucosinolate contents in Chinese cabbage
Kim, Young-Jin ; Chun, Jin-Hyuk ; Kim, Sun-Ju ;
Korean Journal of Agricultural Science, volume 42, issue 4, 2015, Pages 415~421
DOI : 10.7744/cnujas.2015.42.4.415
Ca is material to used in Chinese cabbage (Brasica rapa L. spp. pekinensis). The variation of inorganic ions and GSLs in Chinese cabbage cultivated to control additional Ca contents in slaked lime. The additional fertilizer of slaked lime differ four grade that 0 g (Ca-0), 0.28 g (Ca-1), 0.56 g (Ca-2), 0.84 g (Ca-3) are week intervals with a total of 8 times after transplanting. Inorganic ions in Chinese cabbage (`Bulam plus`) were analyzed to use inductively coupled plasma atomic emission spectometry(ICP). The more additional slaked lime input, the more almost macronutrients contents were high except Ca. Ca contents were higher in Ca-0 (153.10) and lower in Ca-3 (130.55 mg/kg dry weight, DW). GSLs were identified based on peak retention time in previous results of our laboratory. Seven GSLs including two aliphatic (gluconapin, glucobrassicanapin), one aromatic (gluconasturtiin), four indolyl (glucobrassicin, neoglucobrassicin, 4-methoxyglucobrassicin, 4-hydroxyglucobrassicin) were detected using HPLC. Progoitrin, 4-methoxyglucobrassicin, and gluconasturtiin contents increased in proportion to the input in additional slaked lime. Total GSLs contents were Ca-0 (11.95), Ca-1 (17.02), Ca-2 (19.63), Ca-3 (
dry weight, DW). Total Ca and GSLs contents (Ca-1,2,3; mean 17.92) are higher than non treatment (Ca-0;
Effects of reduced additional fertilizer on tomato yield and nutrient contents in salt accumulated soil
Lim, Jung-Eun ; Ha, Sang-Keun ; Lee, Ye-Jin ; Yun, Hye-Jin ; Cho, Min-Ji ; Lee, Deog-Bae ; Sung, Jwa-Kyung ;
Korean Journal of Agricultural Science, volume 42, issue 4, 2015, Pages 423~429
DOI : 10.7744/cnujas.2015.42.4.423
This study was conducted to evaluate the effects of reduced nitrogen (N) and potassium (K) fertigation as additional fertilizer on tomato yield and nutrient contents in excessively nutrients-accumulated soil. Shoot and root dry weights (DW), dry matter rate for shoot, root and fruit and number of fruit in both AF50 and AF100 (50 and 100% levels of additional fertilizer) treatments were increased in comparison with those in AF0 (0% level of additional fertilizer) treatment. In case of nutrient uptake by tomato, nitrogen, phosphorous (P) and potassium contents in all tomato parts (leaf, stem, root and fruit) in AF50 and AF100 treatment were lower than those in AF0 treatment. On the contrary, soluble sugar and starch contents in all tomato parts in AF50 and AF100 were higher than those in AF0 treatment. There were differences between AF0 and AF50 or AF100 in tomato growth, yield, nutrient level and contents of soluble sugar and starch. In contrast, the level and initiation point of fertigation did not significantly affect the parameters. Based on our results, the application of properly reduced level of additional fertilizer is possible to maintain the productivity of tomato and alleviate the nutrient accumulation in plastic film house soils.
Effects of organic matter sources on nitrogen supply potential in arable land
Lee, Ye-Jin ; Yun, Hong-Bae ; Song, Yo-Sung ; Lee, Chang-Hoon ; Sung, Jwa-Kyung ; Ha, Sang-Keun ;
Korean Journal of Agricultural Science, volume 42, issue 4, 2015, Pages 431~437
DOI : 10.7744/cnujas.2015.42.4.431
Recently, assessment of nitrogen balance has been required for environmental agriculture. Nutrient management using organic matters in farmlands has been strongly required as a means of extending resource-cycling agriculture and reduction of nitrogen balance. Organic matters-derived nutrients and soil-available nitrogen should be necessarily considered to manage nutrient balance in soil-plant system. In this study, we reviewed the amount of N supply according to types of organic matter such as livestock compost and green manure in arable land. In case of applied livestock compost in soil, nitrogen mineralization was influenced by nitrogen amount of livestock manure and mixed materials. And nitrogen mineralization of green manure in arable land was influenced by types of crop and return period of green manure because of change of C/N ratio. Also, nitrogen supply by organic matter in arable land can be changed by environmental factors such as temperature, moisture in soil. Therefore, nitrogen supply according to C/N ratio of organic matter and analysis method for estimation of soil nitrogen supply availability should be evaluated to set up the nutrient management model.
Physical drying and frying characteristics of kimbugaks made by a pasting & garnishing machine
Yoo, Soo-Nam ; Choi, Yeong-Soo ;
Korean Journal of Agricultural Science, volume 42, issue 4, 2015, Pages 439~446
DOI : 10.7744/cnujas.2015.42.4.439
Kimbugak is one of Korea`s traditional snacks made of laver. This study was conducted to investigate the physical drying and frying characteristics of kimbugaks made by a pasting & garnishing machine. The drying and frying characteristics should be analyzed to develop a continuous operation system for manufacturing kimbugak because kimbugak has a high moisture content after pasting process. Materials for pasting and garnishing on laver were rice gruel and sesame. The aluminum shelf with square hole was selected as a drying shelf. The recommended size of the square hole type was
because characteristics of deformation and easy separation from the shelf were excellent at the hole size. The drying time of 2 hours was also recommended with the drying temperature of
based on the test results such as dried condition (good), moisture conten t (3.7%), deformation (12.1 mm), and shrinkage rate (19.8%). As the frying conditions for dried kimbugaks, recommended oil temperature and frying time were
, 15 seconds, respectively when corn oil was used. In the case of frying for undried kimbugaks, recommended oil temperature and frying time were
, 2 - 3 minutes, respectively for improvement of work efficiency.
Remote monitoring of light environment using web-camera for protected chrysanthemum production
Chung, Sun-Ok ; Kim, Yong-Joo ; Lee, Kyu-Ho ; Sung, Nam-Seok ; Lee, Cheol-Hwi ; Noh, Hyun-Kwon ;
Korean Journal of Agricultural Science, volume 42, issue 4, 2015, Pages 447~453
DOI : 10.7744/cnujas.2015.42.4.447
Increase of national family income improved demand of high-quality and year-round horticultural products including chrysanthemum. To meet these demand, farmers have introduced protected facilities, such as greenhouses, of which environmental conditions could be monitored and controlled. Environment management up to three weeks after transplanting is critical for chrysanthemum quality. Artificial lighting and light-blocking screen are especially important for long-day (day period > 13 hours) and short-day (night period > 13 hours) treatments. In this study, a web-camera was installed, and the image was obtained and transmitted to mobile phones to monitor the status of 3-wavelength(RGB) lighting environments. RGB pixel values were used to determine malfunctioning of the lighting lamps, and leaking out and incoming illumination status during short-day and long-day treatment periods. Normal lighting lamps provided RGB pixel values of 240~255. During long-day treatment period, G pixel values were useful to detect abnormal lighting conditions (e.g., leaking). During short-day treatment period, R pixel values were useful to determine incoming light (e.g., sun-light). Results of this study would provide useful information for remote monitoring of light conditions for protected chrysanthemum production under artificial lights.
An analysis on the purchase behavior of environment-friendly fruits: grape and mandarin
Kim, Sounghun ; Sohn, Chang-Soo ; Lee, Ki-Young ;
Korean Journal of Agricultural Science, volume 42, issue 4, 2015, Pages 455~460
DOI : 10.7744/cnujas.2015.42.4.455
Even though many Korean consumers have bought environment-friendly fruits, including grapes and mandarins, farmers and suppliers still have little information about how they make a decision for the actual purchase in the real markets. Without the suitable information of purchase behavior of environment-friendly fruits, farmers and suppliers cannot set up the efficient marketing strategy which can create the better agricultural products for Korean consumers. The purpose of this paper is to analyze the consumers` purchase behavior of environment-friendly fruits in Korea. Especially, this study was focused on the grapes and mandarins, through the survey research and the frequency analysis. The results of study in this paper present a few findings useful as follows: First, Korean consumers have the strong concern of environment-friendly agricultural products, including fruits. Second, consumers usually buy environment-friendly fruits by two times per month. Third, consumers generally concern taste, freshness, and food-safety, when they buy environment-friendly grape or mandarin.
Analysis on the priority of policy programs for 6
industrialization in agricultural sector: using AHP
Park, Jeong-Il ; Lee, Do-Kyung ; Kim, Sounghun ;
Korean Journal of Agricultural Science, volume 42, issue 4, 2015, Pages 461~467
DOI : 10.7744/cnujas.2015.42.4.461
The 6th industrialization is one of the most important policies for Korean agricultural sector, and Korean government allocates the large portion of policy budget to promote the 6th industrialization. However, recently, Korean government has experienced the confusion and inefficiency due to too many policy programs for the 6th industrialization. The purpose of this paper is to analyze the current policy programs for the 6th industrialization and to suggest the several guidelines for the more efficient policy system, including the priority of policy programs for the 6th industrialization. The results of studies present a few findings as follows: First, Korean government should evenly promote the 1st, 2nd, and 3rd industry in agricultural sector. Second, the main agent of the 6th industrialization needs to be the ministry of agriculture, food and rural affairs. Third, the policy resource for the 6th industrialization should be focused on the prominent farmers or enterprises. Forth, the policy programs for the 6th industrialization need to be grouped.