关键词: Logistic方程; 春小麦; 灌浆动态

Abstract: 【Objective】 To study the difference of grain filling genotypes of major spring wheat varieties in Xinjiang. 【Method】 Logistic equation was used to fit the grain growth dynamics, and the first derivative of the equation was calculated to obtain the grain growth rate equation, and the main characteristic values of grain filling of major spring wheat varieties in Xinjiang were obtained. 【Result】 The dynamic changes of dry matter accumulation in 9 varieties showed an "S" curve, i.e. the dynamic growth process began from slow to fast and back to slow process. The total dry matter quality of the tested varieties was (23.2±2.87) g/10 spike. The dynamic increase of grain dry matter quality at sampling stage was the highest at 14 and 19 days after the first florescence stage, and the lowest at 31 and 37 days after the initial florescence stage;The theoretical K value of the tested varieties was estimated to be (24.08±3.12) g/10 panicles. The overall performance of the rapid grain filling period was as follows: it entered the initial stage of rapid grain filling 12.60 days after the initial florescence, reached the termination stage of rapid grain- filling 24.94 days after the initial florescence, the duration of the rapid grain filling period was 12.34 days, and the contribution rate of grain dry matter accumulation reached 83.56%±7.06% in the termination stage of rapid grain filling. The overall performance of the maximum relative grain -filling rate (Vm) was (1.40±0.45) g/10 panicle/d. 12.60 days after the initial flowering period entered the starting stage of rapid filling. 【Conclusions 】 In recent years, the grain filling dry matter quality of new spring wheat varieties approved in recent years showed a trend of increasing gradually, namely, the rising trend of grain weight per panicle increased. The 0-25 days after the initial flowering stage was the key period for grain filling of spring wheat in Xinjiang, and it was an important period to make full use of agricultural measures such as water and fertilizer allocation to obtain high panicle grain weight. The four varieties Xinchun 38, Xinchun 44, Xinchun 6 and Xinchun 40 had the potential of high grain weight. Xinchun 39, Xinchun 6 and Xinchun 37 had short grain filling periods and belonged to varieties with relatively faster filling speed. Among them, Xinchu 6 was a strong grain filling variety with higher theoretical K value and relatively faster filling speed.

Key words: Logistic equation; spring wheat; grain filling dynamics