籼型两用系1103S春繁穗间结实率差异及其对产量的影响

DIFFERENCE OF THE SEED SETTING RATES AMONGDIFFERENT PANICLES IN THE PROPAGATINGPOPULATION AT SPRING SEASON AND IT'S EFFECTON THE YIELD IN INDICA TWO-USE LINE 1103S

根据单穗结实率的高低，将籼型两用系１１０３Ｓ春繁群体内的穗子分为３类：Ａ类穗结实率＜１００％，Ｂ类穗结实率＞１０１％，但＜３００％，Ｃ类穗结率＞３０１％。Ａ类穗比例大小与群体平均结实率及春繁产量高低呈极显著负相关；而Ｃ类穗比例大小与后两者呈极显著正相关。在泸州，将１１０３Ｓ温度敏感期安排在５月中下旬，是提高Ｃ类穗比例的关键。在此基础上采取增大种植密度，始穗期喷施３０ｇ／ｈｍ２ＧＡ３等措施，能显著增加春繁产量。

According to the high and low seed setting rates of a single panicle, 1103s' panicles in the propagating population at spring season are divided into 3 types: A type panicles seed setting rate<10%, B type panicles onse <30% but >101%, C type panicles ones>301%. There is a very significant negative correlation between the mean seed setting rate and the yield with A type panicles percentage, and a very significant posititve correlation between them with C type panicles percentage. The key measures to raise C type panicles percentage is that 1103s' sensitive stage of fertiliey chang should be 2nd-3rd ten-day in May. On the basis of ones, further raising the transplanting density and spraying 30g/hm2 GA3 in initial heading date the yield could be increased.