Acute Wilting Occurred in the Late Stage of Yusin, Oryza sativa L.

유신(維新)벼에 나타난 생육후기(生育後期)의 위조(萎凋)

1. Chemical properties of soils and inorganic compositions of rice plants were analysed to explain the acute wilting occurred in the late stage of rice variety, Yusin. The results obtained were summarized as follows. 1) The amount of K and $SiO_2$ of soils where severe rice wilting occurred was lower than that of soils where rice wilting didn't occurred. 2) The amount of N and FeO of wilted rice plants was higher than that of normal rice plants while the amount of $K_2O$ and $SiO_2$ and the ratio of $K_2O/N$ of former were lower than that of letter. 2. Severe wilting was occurred only in the rice variety, Yusin, when three varieties${\cdots}$ Yusin, Milyang #15, Milyang #23${\cdots}$were interplanted. The amount of organic and inorganic compositions of three varieties and chemical properties of rhizosphere soils were analysed. 1) The rice variety, Yusin, was the lowest and that of the rice variety, Milyang #15, was the highest in the level of total carbohydrate and hemicellulose. 2) Comparatively higher levels of K were observed in rhizosphere soil where Yusin was planted, while the level of the K in the plant of Yusin was the lowest.

1. 유신(維新)벼의 생육후기(生育後期)에 나타난 급격(急激)한 위조현상(萎凋現象)을 생리적(生理的)인 면(面)에서 구명(究明)하기 위하여 위조답(萎凋沓)과 건전답(健全沓)의 토양성분(土壤成分) 및 도체(稻體)를 분석(分析) 한 결과(結果)는 다음과 같다. (1) 토양중(土壤中)의 가리(加里) 및 주산함량(柱酸含量)은 위조답(萎凋沓)이 건전답(健全沓)에 비(比)해 낮았다. (2) 도체중(稻體中)의 무기성분(無機成分)은 위조도체(萎凋稻體)가 건전도체(健全稻體)에 비해 질소(窒素)와 철(鐵)의 함량(含量)이 많았고 가리(加里)와 주산(柱酸)은 적었으며 $K_2O/N$의 값도 낮았다. 2. 유신(維新), 밀양(密陽) 15호(號) 및 밀양(密陽) 23호(號) 3품종(品種)을 동일(同一) 포장(圃場)에 혼식(混植)한 결과(結果) 유신(維新)에서만 심(甚)한 위조현상(萎凋現象)을 보였으며 도체상(稻體上) 성분(成分) 및 근권토양(根圈土壤)의 성분(成分)을 분석(分析)한 결과(結果)는 다음과 같다. (1) Total carbohydrate 및 hemicellulos는 위조(萎凋)가 발생(發生)했던 유신(維新)벼에서 그 함량(含量)이 극히 낮았으며 밀양(密陽) 15호(號)에서 가장 많았다. (2) 근권토양중(根圈土壤中)의 K함량(含量)은 유신(維新)벼의 근권토양(根圈土壤)이 약간 높았으나 도체상(稻體上)의 K함량(含量)은 가장 낮았다.