Effect of Defoliation on the Yield Components of Rice

전엽처리(剪葉處理)가 수도(水稻)의 수량구성요소(收量構成要素)에 미치는 영향(影響)

This experiment was conducted to estimate the effect of defoliation on the weight of 1,000 kernels, the rate of ripened grains and the weight of an ear of Yusin and Mylang No. 15 after heading. The resnlts obtained were as follows : 1. The weight of 1,000 kenels, the rate of ripend grains and the weight of an ear were significantly decreased by various defoliation. But there was not found significant difference in 1,000 kernel weight of Mylang No. 15 between each treatment of defoliation. 2. When lower leaves were remained, the weight of 1,000 kernels, the rate of ripened grains and the weight of an ear were more influence than when higher leaves were remained. And the same results were obtained when two leaves were remained at the different leaf position. In order words, when leaf remained was combined with leaf positioned at upper area, the weight of 1,000 kernels, the rate of ripened grains and the weight of an ear were higher than when the leaf was combined with lower leaves. 3. Even though Yusin was early heading variety and subjected to defoliation later than Mylang No. 15 in terms of total physiological maturity the response to defoliation was higher than that of Mylang No. 15 in the rate of ripened grains and ear weight. The exception was found for the 1,000 kernel weight. The result obtained indicated that leaves of Yusin influence more the weight of 1,000 kernels, the rate of ripened grains and the weight of an ear to the later stage than that of Mylang No. 15.

본시험(本試驗)은 유신(維新)과 밀양(密陽)15호(號) 2품종(品種)서 출수후(出穗後) 전엽(剪葉)의 정도(程度)와 정리부위(庭理部位)를 달리했을 때 전엽(剪葉)이 천립중(千粒重), 등숙율(登熟率) 및 수중(穗重)에 미치는 영향(影響)을 알아보고자 용양시험(用陽試驗)을 하였던 바 그 결과(結果)는 다음과 같았다. 전엽처리(剪葉處理)에 따른 천립중(千粒重), 등숙율(登熟率) 및 수중(穗重)은 모두 현저(顯著)히 저하(低下)되었으며 처리간(處理間)에는 고도(高度)의 유의차(有意差)(밀양(密陽)15호(號)의 천립중(千粒重)은 예외(例外))를 보였다. 엽위별(葉位別) 존치엽수(存置葉數)와 그 조합(組合)에 따른 천립중(千粒重), 등숙율(登熟率) 및 수중(穗重)은 엽신(葉身) 1매(枚)를 존치(存置)하였을 때에는 $L_1>L_2>L_3>L_4$순(順)으로 그 영향(影響)의 크기를 보였고, 엽신(葉身) 2매(枚)를 존치(存置)하였을 때에는 상위엽(上位葉)이 조합(組合)된 것이 높았다. 유신(維新)은 처리(處理)가 상대적(相對的)으로 늦었음에도 불구하고 천립중(千粒重)을 제외(除外)하고는 등숙율(登熟率)과 수중(穗重)에서 모두 전엽처(剪葉處)리에 대(對)한 반응(反應)이 밀양(密陽)15호(號)보다 민감(敏感)한 것으로 보아 생육말기(生育末期)에까지 천립중(千粒重), 등숙율(登熟率) 및 수중(穗重)의 증가(增加)에 미치는 엽(葉)의 영향(影響)이 지대(至大)한 것으로 판단(判斷)된다.