Abstract
In order to improve maize yield and nitrogen use efficiency cooperatively,in-season nitrogen management strategy based on soil nitrate nitrogen test was conducted for three years in four fields at Tai'an and Yanzhou city of Shandong province.The results showed that compared with farmers traditional fertilization,maize grain yields of optimized nitrogen management were increased by 2.73%–14.22%,averaged 7.90%,nitrogen rates were reduced by 36.80%–53.85%,averaged 44.75%,nitrogen uptake efficiencies were increased by 13.68%–115.91%,nitrogen recovery efficiencies were increased by 44.26%–377.89%,ni-trogen agronomy efficiencies were increased by 54.31%–271.31%,nitrogen partial factor productivities were increased by 53.38%–141.23%,value cost ratios were increased by 37.35%–93.18%.It suggested that in-season nitrogen management strategy based on soil nitrate nitrogen test could reduce maize nitrogen rate,increase nitrogen use efficiency,improve grain yield and value cost ratio.
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