用^(15)N示踪研究灌溉水平和氮磷配比对砂地小麦生长和氮素平衡的影响  

Study on Effect of Wheat Growth and N Balance under Different Irrigation and Fertilizer Application Using ^(15)N Tracer

作　　者：张起刚[1] 王声斌[1] 彭根元[1] 江荣风 

机构地区：[1]中国农业大学基础科技学院,北京100094

出　　处：《中国农业大学学报》1996年第3期33-38,共6页Journal of China Agricultural University

摘　　要：15N示踪研究证明，在不同灌溉水平下，在细质砂土上，增施磷肥可以大幅度提高小麦单位面积穗数、穗粒数和产量。并可以促进小麦对N素的吸收，提高肥料N利用率，降低肥料N损失率，促进营养物质的运输和转化，但是小麦的千粒重和含N量则随之下降。增施磷肥的效果大于增施N肥。在中等灌溉水平下，每公顷施纯N204kg，施P2O3180kg，可以实现砂地小麦高产高效的统一。This study was carried out in fine sandy soil in Daming County of Hebei Provience from 1992~1993. By increasing irrigation times and adding P fertilizere in sandy soil, the growth and develop ment of tillering and secondary roots of wheat are promoted greatly, the grain yield of wheat and plant re covery of fertilizer N increased, the loss of fertilizer N decreased and the nutrient movement and transfor mation were stimulated plant responded to P fertilizer more significantly than to N fertilizer in fine sandy soil. The results also show that application of N at 204 kg·hm-2 and P2O5 at 180 kg·hm-2 could gain both high yield and high efficiency at middle irrigation level.

关 键 词：冬小麦 细质砂土 灌溉 氮肥 磷肥 配比 

分 类 号：S274.1[农业科学—农业水土工程] S512.107.1[农业科学—农业工程]