密度与氮肥运筹对宁麦9号氮代谢的调控效应

Effects of plant density and nitrogen application metabolism of wheat varieties Ningmai 9

在大田试验条件下,研究密度与氮肥运筹对弱筋小麦品种宁麦9号植株氮代谢变化的影响,分析氮素运转与籽粒品质、产量的关系。结果表明:增加密度、降低施氮量或氮肥施用前移可显著降低植株氮素积累;各处理叶片氮素转运量和转运氮对籽粒的贡献率最高,其次为茎鞘,颖壳及穗轴最低。氮素转运量与转运效率呈显著正相关(r=0.7837~*)。适当降低花后14～35 d硝酸还原酶活性,籽粒蛋白质含量降低,籽粒品质改善。宁麦9号采用密度为240万·hm^(-2)、施氮量为240 kg·hm^(-2)和基肥、壮蘖肥、倒2叶肥比为7:1:2,可实现优质高产。

Effects of plant density and nitrogen fertilizer on nitrogen metabolism of weak-gluten wheat varieties Ningmai 9 with good grain quality were studied.The relationship of nitrogen remobilization with grain quality and grain yield was al- so analyzed.Increasing plant density,decreasing nitrogen application amount or increasing basal:top dressing nitrogen ap- plying ratio could obviously decrease plant nitrogen accumulation.The order of nitrogen translocation quantity efficiency and contribution rate of transf...