追氮时期对冬小麦品种矮抗58子粒灌浆特性的影响

Effect of Nitrogen Applying Stages on Grain Filling Characteristics of Winter Whea ‘tAikang58’

在大田高产栽培条件下,以冬小麦品种矮抗58为试验材料,研究了不同追氮时期(越冬期、返青期、起身期、拔节期和孕穗期)对其子粒灌浆特性的影响。结果表明,不同时期追氮处理小麦子粒灌浆过程均呈慢-快-慢的"S"型变化曲线,子粒鲜重和干重随灌浆进程的推进呈增加趋势;子粒体积随灌浆进程推进呈先增加后下降的趋势。不同追氮时期对矮抗58子粒灌浆特性的效应不同,以起身期追氮子粒干物质积累量和灌浆速率表现最大。

Under the field conditions,effects of nitrogen applying stages on grain filling were studied using winter wheat cultivar‘Aikang58’as materials.The results indicated that the process of grain weight increase presented＂Ss＂hape during the course of wheat grain filling.Grain weight and dry weight were an increasing trend in the process of grain filling;grain volume increased at first and then decreased.Effects of nitrogen applying stages on grain filling are different,the highest grain dry matter accumulation and grain filling rate of＇ Aikang58＇were observed in N3 treatment.