施氮量对旱地小麦强势粒和弱势粒灌浆及产量的影响

为给旱地小麦高产栽培中合理施氮提供依据,在盆栽条件下,以两个旱地小麦品种长武134和长旱58为材料,研究了施氮量对旱地小麦强势粒和弱势粒灌浆特性和产量的影响。结果表明,两个品种的产量、穗粒数和穗粒重均随施氮量的提高呈增加趋势,但千粒重受施氮量影响较小。强势粒的灌浆速率在整个灌浆过程中均明显高于弱势粒。随施氮量的增加,强、弱势粒的灌浆速率都呈现先升后降的趋势。强势粒粒重与平均灌浆速率和总灌浆时间呈正相关,而弱势粒粒重与最大灌浆速率持续时间和各阶段灌浆持续时间呈正相关。

Effects of Different Nitrogen Levels on Grain filling Characteristics and Yield of Two Dryland Wheat Cultivars for Superior and Inferior Grain

The effect of nitrogen level on grain filling characteristics and yield of dryland wheat cultivars for superior and inferior grains under the condition of pot culture were studied. The result indicated that did not influenced N application in creased grain number,grain weight and yield,but thousand grain weight.The filling rate of superior grains was obviously higher than that of inferior grains,and both superior and inferior grain filling rate shows the trend of increasing at first, then decreasing with the increase of nitrogen level.Correlation analysis indicated that, there existed significantly positive correlations of superior grain weight with filling rate and accumulative time.However,there were significantly positive correlations of inferior grain weight with the duration of the maximum filling rate and duration of each filling stage.