三熟制小麦丰产结构研究

Studies on the Yield Components for High Yielding Wheat in Annual Three-crop System

三熟制小麦产量构成中，以单位面积穗数和每穗粒数变异最大，对增产的净贡献率最高。分蘖期短促，主要依靠主茎构成穗数。小麦多花，退化率高达７０％～８０％，培育大穗的潜力在减少小花退化。

The research results showed that among the factors of grain yield component of wheat in annual three- crop system, the panicle number per unit and the grain number per panicle appeared to be the most obvious variation, which contributed the greatest to the increase of grain yield. The tillering duration of wheat in annual three- crop system was short. Thus the panicle number mainly depended on main stem heads. The wheat showed more spikelet differentiation, but 70%～80%of them degenerated, therefore the potentiality of getting large- panicle was on decreasing the degen-eration of spileket.