施氮模式对皖麦38淀粉形成与产量的效应

研究在180 kg/hm2施氮量条件下施氮时期和比例对强筋小麦皖麦38籽粒淀粉形成及产量的效应。结果表明：氮肥后移，直链淀粉、支链淀粉、总淀粉含量下降，积累量和积累速率上升；剑叶蔗糖含量和可溶性总糖增加；籽粒蔗糖含量和可溶性糖降低；面粉峰值粘度上升。施氮模式以30%作基肥、5叶期施10%、叶龄余数2.5和0.5时各施30%为最

Effects of Nitrogen Application Pattern on Starch Formation and Grain Yield in Strong Gluten Wheat Wanmai 38

Effects of nitrogen application pattern,including different time and ratio,on starch formation and grain yield of strong gluten wheat cultivar Wanmai38 were studied under the condition of 180 kg/hm~2 nitrogen application from 1999 to 2001. The results showed that as the N top dressing delayed,amylose,amylopectin and total starch contents in grains reduced,but their accumulating amount and rate increased;soluble sugar and sucrose contents in flag leaves rose,but declined in grains. Peak viscosity of flour also increased. The nitrogen application pattern of 30% as basic fertilizer,10% dressing in 5th leaf stage,and two 30% dressing at leaf-remainder 2.5 and 0.5 time respectively was optimum for the improvement of yield and quality in wheat.