农学
播种
氮气
产量(工程)
灌溉
环境管理体系
粮食产量
耐旱性
环境科学
小麦粒
盐度
化学
生物
材料科学
生态学
有机化学
冶金
出处
期刊:Australian Journal of Experimental Agriculture
[CSIRO Publishing]
日期:1992-01-01
卷期号:32 (3): 383-383
被引量:12
摘要
Grain yield, protein, and nitrogen uptake responses are reported for 6 wheat fertiliser experiments in northern New South Wales which were representative of sites that were highly responsive, moderately responsive, and non-responsive to nitrogen (N) fertiliser applied at sowing. Apparent recoveries of applied N of 33-57% in the grain were recorded where grain yield was steeply increasing in response to additional applied N. Where yield increases were smaller in response to increments of N fertiliser, N recovery was 22-3096, but where further N application increased grain protein content but not grain yield, apparent recovery of additional fertiliser N fell below 20%. Apparent recovery was less than 10% in experiments where there was no yield response to N fertiliser. The implications for fertiliser recommendations are discussed relative to potential premium payment for wheat protein levels. It was concluded that established premium payments are too low to make N application an economic proposition to increase grain protein levels in the absence of grain yield responses.
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