在大小麦栽培过程中,各项措施都是围绕着促进产量构成的三个因素进行的。实践证明,产量结构形成与大小麦生长发育过程中的营养生长期、生殖生长期和籽粒充实期(或称前期、中期、后期)所处的外界环境及其内在的生理活动有密切关系。这三个时期的长短和当时的气象因素、栽培条件等对 In the process of cultivation of wheat and wheat, the measures are all based on three factors that promote the formation of output. It has been proved that the formation of yield structure is closely related to the external environment and its intrinsic physiological activities in vegetative growth, reproductive growth and grain filling (or early, middle and late stages) of wheat and wheat. The length of the three periods and the meteorological factors of the time, cultivation conditions and so on