关键词: 年增加量, 年增加量

Abstract: By establishing the growth model of maize in relation with the number of growing day, the active and effective accumulated temperatures, and determining the growth critical points in relation with maize dry matter accumulation, a scientific basis for field management would be provided. Different-stage sowing data were used. 21 growth models were established (Logistic equations were tested by 0.01 level extreme significance). The growth period of dry matter weight of maize in relation with the number of growing day, the active and effective accumulated temperatures, was divided into 3 stages, including gradual growth period, fast growth period and slow growth period. and began to enter the fast growth period when the active accumulated temperature was 1449.7℃·d. The fastest active accumulated point was 1733.7℃·d. It entered slow growth period at 2008.5℃·d. The active accumulated temperature of the termination point was 2717.3℃·d. When the effective accumulated temperature was 761.4℃·d, it entered into fast growth period. The fastest effective accumulated point was 912.0℃·d. It entered slow growth period at 1068.6℃·d. and the effective accumulated temperature of the termination point was 1447.3℃·d. The accumulated temperature points at different stages could be used for determining the water and fertilizer management, in order to get the optimal economic benefits.