论文部分内容阅读
以中粳稻盐粳４号和杂交中籼稻汕优６３为材料，采用密肥试验与拔节期疏蘖处理，研究水稻生育中期群体叶面积组成和光合特性与产量形成的关系。结果表明：高光效群体在（Ｎ－ｎ）叶龄期够苗，拔节期的总茎蘖数相当于适宜穗数的１．２～１．３倍；拔节期４叶龄以上分蘖数量等于适宜穗数，３叶龄以下分蘖在总茎蘖数中的比例为１５％～２０％；在适宜叶面积下，有效和高效叶面积率分别为９０％～９５％和７５％～８０％；则抽穗期叶片含Ｎ率和叶片的净光合率高，抽穗后叶面积衰退慢，光合势和净同化率大，籽粒产量高。
The relationship between the leaf area composition, photosynthetic characteristics and yield formation of mid-term paddy population was studied by using high-yielding test and jointing-tillering treatment with the middle japonica rice, Yanjing 4 and the middle indica hybrid, Shanyou 63 as the material. The results showed that the total number of tillers at jointing stage was 1.2-1.3 times that of high tillers at the leaf age of (N-n), and the number of tillers at 4-leaf stage at jointing stage was equal to the appropriate number The number of spike, the number of tillers under 3 leaf age was 15% ~ 20% of the total number of tillers; effective leaf area and effective leaf area were 90% ~ 95% and 75% ~ 80% The leaf N content at heading stage and the net photosynthetic rate of leaves were high, the leaf area declined slowly after heading, the photosynthetic potential and net assimilation rate were high, and the grain yield was high.