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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Korean Journal of Crop Science
Journal Basic Information
Journal DOI :
The Korean Society of Crop Science
Editor in Chief :
Volume & Issues
Volume 34, Issue s02 - Dec 1989
Volume 34, Issue 4 - Dec 1989
Volume 34, Issue 3 - Sep 1989
Volume 34, Issue s01 - Jun 1989
Volume 34, Issue 2 - Jun 1989
Volume 34, Issue 1 - Mar 1989
Selecting the target year
Morpho-Physiological Studies on Elongation of Mesocotyl and Seminal Root in Rice Plant II. Effects of Seed Treatment and Soil Moisture Content on Mesocotyl Elongation
Korean Journal of Crop Science, volume 34, issue 4, 1989, Pages 325~330
This study was undertaken to assess the effects of seed treatment and soil moisture content on mesocotyl elongation in rice seedlings. The effect of the high temperature pre-treatment on the mesocotyl elongation was 7 times as great as the control (non treatment). The mesocotyl lengths were of maximum value at the 8％ soil moisture, but of minimum value at the 16％ soil moisture plot, showing decreasing trend of mesocotyl length as soil moisture increases. The mesocotyl elongations were much greater at the ABA treated plot than at the GA
, IAA and Kinetin plots. The relationship between the mesocotyl and excised root elongations was not evident, but the weight of excised roots became heavier with longer mesocotyl length.
Prevention of Barn Rot during Curing of Burley Tobacco. II. Effect of Curing Conditions and Supplemental Heat.
Korean Journal of Crop Science, volume 34, issue 4, 1989, Pages 331~334
This studies were carried out to investigate the effects of the management of curing barn and the use of supplemental heat on prevention of barn rot during the rainy season. The managemental methods of curing barn were combined with hanging spaces ranged from 15cm to 30cm and ventilating conditions. The supplemental heat was applied with oil burner and oil fan heater. Barn rot was reduced in the wider hanging spaces, and the effects of hanging spaces was larger with ventilating during curing. Barn rot decreased by ventilating condition than non-ventilation. The use of supplemental heat dropped to lower relative humidity in curing barn. Supplemental heat and forced-air movement greatly reduced barn rot in comparison with tobacco cured under natural conditions.
Studies on Productivity and Nutrient Quality of Forage Rape (Brassica napus Subsp. oleifera) VI. Influence of Sowing and Harvest Date on Yield and Nutritional Quality
Jung-Il Lee ;
Korean Journal of Crop Science, volume 34, issue 4, 1989, Pages 335~340
In order to find out the optimum harvest (clipping) date combined with sowing date on yield and nutrient Quality of forage rape which is suitable at the southern part of Korea, Velox, introduced variety was grown from Sep. 1987 to May 1988 at Sunchon National University, and yield and nutrient Quality of plant were observed. As harvest date and sowing date were delayed, the plant length was longest, number of branch and leaves per main stem were increased in the time of full bloom clipping and Sep. 24 sowing but stem diameter was thickest in the early sowing. Fresh yield was heaviest in the time of flowering clipping and Sep. 24 sowing but the most dry matter yield was heaviest in the time of full bloom clipping and Sep. 24 sowing. Content of crude protein was highest and that of crude fiber such as NDF, ADF, hemicellulose, cellulose and lignin were lowest in the late time of clipping and sowing. Further more IVDMD was high and dry matter yield and digestible dry matter yield were highest in the time of flowering clipping and Sep. 24 sowing. Judging from the results reported above, at optimum harvest (clipping) date combined with sowing date for yield and nutrient Quality of forage rape seemed to be the time of flowering clipping and Sep. 24 sowing.
Effects of Fertilization Methods on Ethylene Evolution and Shattering in Rice Grains
Korean Journal of Crop Science, volume 34, issue 4, 1989, Pages 341~344
The relationship between the rates of rice grain shattering caused by typhoon and characteristics considered to be related with grain shattering such as heading date, amount of grain production and ethylene evolution of rice plant grown under the different methods of fertilization was analyzed. The grain shattering rates which was traced by the fallen grains after typhoon 'Dinah' occured in August 28 to 29, 1987, in the plots with nitrogen such as nitrogen alone, NP, NK, NPK, NPK + SiO
and NPK+compost plot etc. was lower than that in without nitrogen plots such as no fertilizer, compost alone, PK, P and K alone etc. and the amount of ethylene evolved from the leaf blades also showed the same trends. The correlation between the grain shattering rate and grain yield was negative but ethylene evolution was positively correlated with grain shattering rate of rice plant.ice plant.
Concentration and Immunological Characteristics of Lectin in Soybean (Glycine max L.) Cultivars
Korean Journal of Crop Science, volume 34, issue 4, 1989, Pages 345~352
The immunochemical property of lectin in soybean and the presence of lectin in seeds of six soybean cultivars were investigated by immunochemical methods. All seeds of six soybean cultivars formed one precipitin line against the soybean lectin antibody and showed immunochemically homologous precipitin pattern among the cultivars in immunodouble diffusion test. Four antigenic components in soybean lectin were detected by the crossed imuno-electrophoresis of a soybean seed antigen against the soybean lectin antibody. Cultivar, Jangyeop-kong contained the highest amount of lectin and the next were Kwangkyo, Hwangkeumkong, Baegunkong, and Jangbaegkong or Paldal-kong in order of lectin content. The lectin purified from the seeds of six soybean cultivars agglutinated rabbit erythrocytes, but did not agglutinate the fungal spores which were Fusarium sp., Alternaria sp., Cuvalaria sp., and Colletotrichum sp. isolated from the infected seeds or leaves of soybean.
Response of Flax Varieties to Fertilizer Levels
;Jong-Kyu Hwang;Eung-Ryong Son;Jung-Il Lee;
Korean Journal of Crop Science, volume 34, issue 4, 1989, Pages 353~357
This study was conducted to find out the optimum fertilizer level for three flax varieties Wiera, Stoment-Goss and Taijungsun#l from the winter cropping on drained paddy field of new experimental field in Muan at 6 compositions of fertilizer levels. Maturation dates was delayed in dressing plots, that was delayed to 3 or 4 days in Wiera and Stoment -Goss, 1 or 2 days in Taijungsun#l and it was early in Wiera and Stoment-Goss, 1 or 2 days in Taijungsun#l and it was early in the non dressing plot. Stem length was longest, oil content was increased, stem and seed yield were heaviest at the compositions of fertilizer amounts with N-P
O were 8-6-4 Kg/10a. Maturation dates, Stem length, Oil content, Stem yield and Seed yield showed significant difference between fertilizer level and showed positive correlation. Judging from the results reported above, in optimum fertilizer amounts for N-P
O from the winter cropping on drained paddy field of new experimental field in Muan seemed to be 8-6-4 Kg /l0a
Effect of Difference between Soil- and Air-temperatures on Agronomic Characters of a Barley Cultivar Kangbori(Hordeum vulgare L. Emend. Lamark)
Korean Journal of Crop Science, volume 34, issue 4, 1989, Pages 358~363
This experiment was carried out to analyze the effect of different air- and soil-temperatures on the major traits of barley including grain yield. Outdoor growth cabinet and soil temperature equipment were used for this study to control the air- and soil-temperatures during the plant growth. Earlier heading appeared at the higher soil-temperature under same air-temperature, and more stems showed when conbined with 25
of air-temperature and l0
soil-temperature than any treatment. There appeared, however, the longest spike length, awn length, distance from flag-leaf to spike and culm length at 20
of air-temperature and 10
of soil-temperatures. As far as grain yields are concerned, there showed the highest yield on the condition combined with 20
of air-temperature and 10
Maize with Multiple Ears and and Tillers(MET) IV. Leaf Characteristics of IK Type Maize with Tillers
Choe, Bong-Ho ; Lee, Hee-Bong ; Lee, Won-Koo ; Kang, Kwon-Kyu ; Choi, Chang-Yeol ;
Korean Journal of Crop Science, volume 34, issue 4, 1989, Pages 364~369
Leaf characteristics of main stem and tiller of IK type maize (IK/ /IRI/B68) were compared with those of Jinjoo Ok hybrid which are not usually tillered. A total of nine leaves from flag leaf to the third or the fourth leaf below ear-bearing node were sampled from each stem or tiller. There was no significant difference in mean leaf length between IK/ /IRI/B68 and Jinjoo Ok. But the mean leaf width of IK/ /IRI/ B68 was about 2 cm narrower than that of Jinjoo Ok. The mean leaf area of the IK/ /IRI/B68 was also smaller than that of Jinjoo Ok due to the narrower leaf width. There were not significant differences in mean leaf characteristics between main stem and tillers of IK/IRI/B68. The longest leaf was the leaf below the ear-bearing node and the widest leaf was the leaf just above the ear-bearing node. Mean length. width and area of leaf on main stem and tillers were similar. Coefficients of variation calculated for individual leaf indicated that the leaves near the ear-bearing node were more uniform than others. The leaf area measured was significantly greater than that estimated by formular, length x width x 0.75. New constant to estimate leaf area of tillering maize was derived as 0.8.
Seed Dormancy of Jerusalem Artichoke (Helianthus tuberosus L.) and Seed Treatment for Germination Induction
Korean Journal of Crop Science, volume 34, issue 4, 1989, Pages 370~377
Jerusalem artichoke (Helianthus tuberosus L.) as a biomass potential crop has several distinct advantages such as vigorous growth on poor land and high yield of carbohydrate. In this crop, seed dormancy has hampered the efforts of seed-propagration and to use them in breeding programs for improving jerusalem artichoke. Several seed treatments were tested to determine their effectiveness in overcoming the seed dormancy found in five collected varietes of jerusalem artichoke. The first results showed that the seed fertilities of five collected varieties ranged from 2.4％ to 14.7％ and the number of seed produced by one plant ranged from 88 to 1058. Germinability of seeds stored for 3 months at room temperature after harvest was almost 0％ and it was not improved by addition to the treatments of temperature, light and GA3, while germinability of seeds stored for 27 months at room temperature after harvest increased to 47.5％ in germination rate. But the removal and pin-pricking of seedcoat were very effective in breaking the seed dormancy, giving germination of 96.8％ and 82.3％, respectively. These results showed that the seed dormancy of jerusalem artichoke was induced by the seedcoat. Besides the treatment of seedcoat removal and seedcoat-pinpricking, the treatment of low and wet stratification was also effective in breaking the seed dormancy of jerusalem artichoke. Whole dormant seeds incubated for 70 days in low and wet condition germinated over 85％.
Short Culm and Early Maturing Mutants Induced by Gamma Irradiation in Rice I . Mutation Rate and Variability
Byong-Hee Hong ;
Korean Journal of Crop Science, volume 34, issue 4, 1989, Pages 378~383
For selection of mutants two rice varieties, Sangpungbyeo and Seomjinbyeo, were irradiated with 20 kR and 25 kR of gamma rays. One panicle per each plant was harvested in Ml, and single needling per hill was planted for M2 and M3 generations. Mutations for short culm, earliness and the major traits were examined. 1. The mutation rates were varied with the rice varieties and the doses of radiation, higher in Sangpungbyeo and 25kR than in Seomjinbyeo and 20 kR, respectively. 2. The rates in Sangpungbyeo with the 20 kR and 25 kR were 1.10％ and 1.47％. respectively and those of Seomjinbyeo were 0.51％ and 1.25％, respectively. 3. The culm lengths of short-culm mutants derived from Sangpungbyeo and Seomjinbyeo were reduced about 10％ compared to their mother varieties, especially it was possible to select the dwarf mutants reducing 57％ and 40％ of culm length in Sangpungbyeo and Seomjinbyeo, respectively with the dose of 25 kR irradiation. 4. The range of heading date of the mutant ion in the M3 generation was comparatively wide. Many earliness mutants shortened about 7 days were selected as compared with their mother varieties, some mutants of the irradiated group had early matured by 20 days and 30 days, respectively in both Seomjinbyeo and Sangpungbyeo.
Morphological Characters of Tongil and Japonica Type of Rice Grains
Korean Journal of Crop Science, volume 34, issue 4, 1989, Pages 384~389
Thirteen varieties of Tongil type and ten of Japonica type which were produced in Korea, in 1985, were campa red in namely, width, thickness, length and weight of rice grains. Thousand-grain weight of paddy, brown rice and milled rice were not significantly different between Tongil type and Japonica type, but difference of paddy-brown rice and brown rice-milled rice had significant (p<2,859** and 4.316***, respectively), and the ratio of difference of paddy-brown rice was higher Tongil type than Japonica type. Width, thickness and length of paddy, brown rice and milled rice was significant (width : p<5.189***, 5.289** and 5.466***, thickness: p<3.371** 4.074*** and 5.988***, length: p<3.016**, 4.419*** and 5.492*** in paddy, brown rice and milled rice, respectively) between the Tongil type and Japonica type, and then the width and thickness of Japonica type were thicker than Tongil type, but length of Japonica type was shorter than Tongil type width/thickness ratio of paddy wes significant (p<2.396*) between the Tongil type and Japonica type, but its brown rice and milled rice was not. And length/width and length/ thickness ratio of paddy, brown rice and milled rice were significant (length/width : p<5.525***, 5.495*** and 5.863***, length/thickness: p<4.734***, 6,863*** and 8.425*** in paddy, brown rice and milled rice) between the Tongil type and Japonica type, and then its ratio were higher Tongil type than Japonica type.
Effects of Defoliation Methods on Sink and Source in Perilla I . Effects of Defoliation Time and Degree on Leaf and Grain Yield
Jung-Il Lee ;
Korean Journal of Crop Science, volume 34, issue 4, 1989, Pages 390~395
This experiment was conducted to study the effect of different defoliation methods on the same leaf characters and grain yields of perilla. Transplanting dates were from June 20, July 20, to August 20, 1989, and defoliated 30, 40, 50, 60 days after transplanting, respectively. The results obtained are summerized as follows: In the case that the fully developed leaves were defoliated, the number of total leaves were increased by more defoliations and by the later defoliation, Leaf length, width and area, fresh leaf weight, defoliated leaves per plant and grain yeidls were significantly influenced by the defoliation methods, Grain yields of the defoliation plots were lower than that of non-defoliation plot, As the above results, considering the grain yield, defoliation may be available in the case of one or two times of defoliation at the early growing stage. The profits from any type of defoliation were higher than that for grain yield only,
Effects of Fertilizer Levels on Productivity and Quality of Pearl Millet
Keun-Yong Park ; Rae-Kyung Park ; Byeong-Han Choi ;
Korean Journal of Crop Science, volume 34, issue 4, 1989, Pages 396~399
Pearl millet (Pennisetum americanum (L.) Leeke) is a promising forage crop that is resistant to biotic and abiotic stresses, and has a capability to grow well not only in the fertile soil, but also in the poor and dry soil, The objective of the study was to investigate the effects of increased fertilizer application level on the productivity and Quality of pearl millet in the old and newly reclaimed upland soils of Suwon, Chungju, Jeonju, Jinju and Jeju in Korea from 1986 to 1988, Plant height, green fodder yield, protein content and digestibility were increased by the increased fertilizer application level. However, the increased fertilizer application caused lodging, so that the plants grown above one meter in canopy height would be desiable to be clipped remaining 20cm above the ground surface before lodging, and fed to cattle, Mean green yields of the N 45-60kg/l0a application were 12.7-13.4t/l0a in the old upland soil. Increased phosphorus and potash fertilizer application also increased productivity, especially with potash fertilizer effect being higher than that of phosphorus fertilizer, In the newly reclaimed upland soil, improved and doubled fertilizer application plot of 60-60-40-4000kg/10a in N-P
O-Compost was 38％ higher being 12.6t/10a of green fodder yield as compared with standard fertilizer application plot, Pearl millet productivity and Quality were higher than those of maize and sorghum/sudan grass hybrids, particularly in green fodder yield, protein content and digestibility,
Studies on the Response of Rhizobium Inoculation and Nitrogen Concentration to Soybean Growth in Nutri-culture 2. Effects of Rhizobium Inoculation and Nitrogen Concentration on Growth and Yield of Soybean Cultivars
Korean Journal of Crop Science, volume 34, issue 4, 1989, Pages 400~407
This experiment was carried out to study the effects of nitrogen concentration of cultural solution, Rhizobium inoculation, and planting density on the growth and yield of soybean cultivars, Hwanggeumkong, Jangbaegkong, Paldalkong, Clark, and non-nodulation isoline of Clark. Rhizobium inoculation increased the stem length, particularly in Hwanggeumkong, Jangbaegkong, and decreased it significantly in non-nodulation Clark. Stem length was increased by the increase in nitrogen fertilization by the 195ppm level and decreased by the increase in plant population density. Rhizobium inoculation also increased the shoot dry weight, but significantly decreased it in non-nodulation Clark. As nitrogen concentration in the cultural solution increased the shoot dry weight decreased in Jangbaegkong and paldalkong. However, the shoot dry weight was decreased by the increase in plant population density. Rhizobium inoculation and the increase in nitrogen concentration of cultural solution increased the ratio of shoot dry weight to root weight. The Rhizobium inoculation and the increase in nitrogen concentration of cultural solution increased the grain yield per pot in Hwanggeumkong and paldolkong, While non-nodulating Clark showed significant decrease in grain yield. Grain yield per pot was also increased by the increase of plant population density. Grain yield was significantly correlated with shoot dry weight, nodule number, and nitrogen content of the soybean plants. The correlation between nitrogen contents of the soybean plants and stem length, shoot dry weight, and nodulation was significant. The allantoin-N content in stem was also significantly correlated with nodulation.
Effects of Green Chopping on Grain Yield of Naked and Malting Barleys in Cheju
Korean Journal of Crop Science, volume 34, issue 4, 1989, Pages 408~421
The effects of seeding and clipping termination dates, and seeding and fertilizer rates on forage and grain yields were evaluated in 1989 harvest year for dual production of forage and grain of naked and malting barleys in Cheju province. In the experiment I, 'Saessalbori' (naked barleY)1 and 'Doosan 22' (malting barley) were seeded on Sept. 21, Oct. 12 and Nov. 2, respectively. An unclipped(grain-only) treatment that was planted on Nov. 2 was included for check. In the experiment II, the two above cultivars were planted at seed rate of 14, 20 and 26 and kg/l0a. Fertilizer rates were 9-6-12, 17-13-8 and 22-16-11 (N-P
O) kg/l0a. Seeding dates were Oct. 13 and Nov. 7 for clipped treatments and grain -only treatment(seeding rate: 14kg/l0a, N-P
O=9-6-12 kg/l0a), respectively. All treatments in both experiments were harvested for grain yield. In Saessalbori, survival following forage removal was 100％ regardless of seeding and clipping termination dates, and seeding and fertilizer rates. In Doosan 22, survival percenage decreased with increasing seeding and fertilizer rates when plants was clipped in January to Febuary. Forage yield of two cultivars increased with early planting and delays in clipping termination and tended to increase as seeding and fertilizer rates were increased. Crude ash and fat were not affected by seeding and fertilizer rates, and clipping date. Crude protein increased with an increase in fertilizer rate and decreased with delays in clipping date. N free extract tended to increase with delaying clipping date and decreased with increasing fertilizer rate. Earlier planting resulted in earlier heading and maturity. Clipping slightly delayed heading of Saessalbori and greatly delayed that of Doosan 22. Maturity of Doosan 22 was delayed 3 to 5 days by increased fertilization. Clipping shortened culm length more severely in Doosan 22 than in Saessalbori. The later the clipping termination, the shorter the culm length. The number of spikes per m
and the number of kernels per spike were not affected by clipping in Saessalbori while those of Doosan 22 were decreased with delays in clipping termination. Delaying forage harvest resulted In a reduction in grain yield. However, final clipping on Feb. 27 reduced grain yield of Saessalbori by only 6-11 ％ compared to the grain-only treatment. In Doosan 22, forage harvest after Dec. 28 resulted in 6 to 66％ reduction of grain yield. The data indicate that grazing of naked and malting barleys until late Feb. and late Dec., respectively, might not reduce grain yields when planted on mid-Sept. to mid-Oct.
Response of Korean ginseng (Panax ginseng C. A. Meyer) to 2, 4-D I . Effects of 2, 4-D concentrations on Growth and Root Yield
Korean Journal of Crop Science, volume 34, issue 4, 1989, Pages 422~427
Weeds may compete detrimentally with the ginseng for moisture and nutrients but hand weeding is the only practical means of eliminating weeds after crop establishment. To define the effects of 2, 4-D herbicide application on the plant growth and root yield of Korean ginseng (Panax ginseng C. A. Meyer). the herbicide 2, 4-D was applied as a foliar spray with the rates of 0.5. 1.0. 1.5 and 2.0 times of the recommended herbicide dosage 70ml/l0a. The Korean ginseng treated with 2, 4-D in the rate of two times concentration was indistinguishable from nontreated plants in visual rating for foliar symptoms. There were no significant differences of the leaf length and width as well as the stem length and diameter in check plants and those recieving 2, 4-D treatments. The. berry maturing in 3 and 4-years old ginseng was not inhibited with 2, 4-D treatment. The root weight of the 4-years old ginseng plant was not reduced by 2, 4-D application of 2 times dosage. However. when the ginseng seedling was treated with 2, 4-D. detrimental phenomena as stem bending and dicoloration of marginal part of seedling leaf were occured but stem bending was recovered in a few days.
Machine Transplanting Cultivation with Infant Seedling in Rice Plant I. Effects of Different Nursery Soil and Plumule Length on the Infant Rice Seedling for Machine Transplanting
Rae-Kyung Park ; Yong-Dea Yun ;
Korean Journal of Crop Science, volume 34, issue 4, 1989, Pages 428~433
The objective of this experiment was to determine if there were feasible to transplant infant rice seedling for machine transplanting. Cultivars tested were Sobaegbyeo and Daecheongbyeo, ]aponica type cultivars. Infant seedling, young seedling and semi-adult seedling were raised with sailor rock wool in seedling tray from 1986 to 1988. Infant rice seedling raised more than 4 days after sowing with rock wool was uniform, and low in ratio of missing hill at machine transplanting. Tiller number per m
was more in infant rice seedling, young seedling and semi-adult seedling, in that order. Heading dates were not significantly different among seedlings applied, however rice plant sown directly was later 4 or 5 days than any other seedlings. Panicle number per m
was more in infant seedling than in semi-adult seedling, but ripened ratio was lower in infant seedling due to lodging. Thus there were not greatly different in yield among seedlings tested. Therefore infant rice seedling (more than 5cm in plumule length) raised for 7 days was most optimum, and rock wool would be used as a nursery soil instead of nursery soil for raising infant rice seedling in machine transplanting.
Machine Transplanting Cultivation with Infant Seedling in Rice Plant II. Effects of Raising Temperature, Duration and Nutritional Residue in Endosperm on Seedling Growth after Transplanting.
;Yong-Dea Yun;Rae-Kyung Park;Moon-Hee Lee;
Korean Journal of Crop Science, volume 34, issue 4, 1989, Pages 434~439
This study was carried out to investigate the minimum days for raising infant rice seedling with different temperature (day/night
: 20/12, 25/18, 30/20) and to compare with seedling growth and rooting ability at 10 days after transplanting with endosperm-intacted and removed seedlings. The minimum days for raising infant rice seedling was shown differently with different temperatures, thus there were turned out by mat formation to be 10 days at 20/12
(day/night), 8 days at 25/18
and 6 days at 30/20
, respectively. Seedling height, leaf number and dry weight of top part at the minimum days for raising infant rice seedling were 8-12cm, 1.5-1.7 leaves and 6.9-7. 5cm per seedling, respectively. The seedling growth at 10 days after transplanting was better at high temperatures (25/18
) than low temperature (20/12
) at transplanting, and the growth of infant rice seedling with endosperm -intacted was better than that with endosperm-removed. This tedency was shown significantly in transplanting at 20/12
(day/night) of 4 days seedling.
Variation of Major Characters in Soybean Varieties I . Effects of Seeding Date
Korean Journal of Crop Science, volume 34, issue 4, 1989, Pages 440~448
The present experiment was conducted to investigate the effects of seeding date on agronomic characters including seed weight of soybean (Glycine max (L.) Merr.) at Sunchon, the southern coastal area of Korea. One hundred eighteen native and improved varieties were used in this study. As the seeding date was delayed, the number of days to flowering for the cultivars was reduced. This trend was more obvious in late maturing cultivars(LMC) than in early and medium maturing cultivars (EMC and MMC). Late seeding also resulted in decrease in the number of leaves, stem length, and number of nodes. The heaviest seed weight was obtained with EMC and MMC planted on May, and seed weight decreased with delayed seeding date. Seed weight was positively correlated with number of days to flowering, number of total leaves at flowering, stem length and number of nodes on main stem at maturity. Based on seed weight the cultivars was classified into five types: Type I; Seed weight of the cultivars decreases with delayed seeding date. Type II; Seed weight of the cultivars does not vary with seeding date. Tyep III; Seed weight of the cultivars increases with delayed seeding date. Type IV; Seed weight of the cultivars increases when the seeding date approached the appropriate seeding date, but decreases thereafter. Type V; The reversed type IV. Type I, II, III, IV and V occupied 37, 16, 17, 10 and 20％ of the tested cultivars, respectively.
Root System Formation and Its Relation Grain Yield in Rice Plants
Yamazaki, Koou ;
Korean Journal of Crop Science, volume 34, issue 4, 1989, Pages 449~459