土壤水分调控对冬小麦籽粒灌浆特性的影响

为了给小麦节水高产栽培中土壤水分管理提供依据,采用池栽遮雨的方法，用Logistic曲线拟合不同水分调控条件下籽粒的灌浆过程，研究灌浆参数的差异。结果表明，水分调控对籽粒灌浆参数有不同程度的影响。从灌浆持续时间看，Tmax、T1较稳定。T2变异系数大、T3最不稳定；从灌浆速率看，R较稳定，Rmax、R1、R2变异系数大,R3最不稳定。相比而言，拔节期灌水1次和拔节期＋孕穗期灌水2次对阶段灌浆参数影响较大。强势粒与弱势粒之间灌浆参数差异不明显。表现为强弱势籽粒灌浆趋于同步,强势粒灌浆速率略快于弱势粒。因此在河南高产栽培条件下，提高缓增期灌浆速率（R3），相对延长缓增期持续天数（T3），促进落黄,对提高粒重有利。

Study on the adjustment of Grouting Characteristics of Winter Wheat Seed by Soil Water Controlling

The process of grouting controlled by water is conformed by Logistic curve and the difference of grouting parameter is analyzed in wheat grown in water-proof shelf.The result showed that water controlling brings different effect on grouting parameter.At the aspect of the length of grouting,T_(max) and T_1 are more stable than T_2 and T_3;At the aspect of the velocity,R is the most stable,next is R_(max),R_1,R_2;There are obvious effects on grouting parameter when watering once at internode elongation stage or internode elongation stage and booting stage twice;the divergence of strong and weak seed is not distinct in the grouting parameter,strong seed is better than weak seed.Under the circumstances of high-yield planting at Henan,increasing slow-growth stage of grouting(R_3),and enlonging duration of slow-growth stage(T_3)relatively,boosting yellow ripening,is advantaged to increase grain-weight.