我国北方地区几种主要作物氮营养诊断及追肥推荐研究 Ⅰ.几种主要作物氮磷施用量的研究

通过田间试验研究了春小麦、冬小麦、春玉米和夏玉米四种作物氮、磷施用量。结果表明，随作物和地区不同.各种作物氮肥最适施用量变异很大，其中，冬小麦氮肥最适施用量为100～155.4kghm-2，春小麦为158.7～187.8kghm-2，夏玉米为121～228kghm-2。而磷肥最适施用量变化不大，仅春小麦略有差异，为71.9～94.4kghm-2。该研究结果为通过快速营养诊断的方法指导作物追肥提供了依据。

NITROGEN NUTRITIONAL DIAGNOSIS AND RECOMMENDATION AS TOPDRESSING FERTILIZER N FOR SEVERAL CROPS IN NORTH CHINA Ⅰ. RECOMMENDATION OF NITROGEN AND PHOSPHATE FERTILIZER FOR SEVERAL CROPS IN NORTH CHINA

This paper is part of The Nitrogen Nutritional Diagnosis and Recommendation as Top dressing Fertilizer N for Several Crops in North China. The rate of nitrogen application for four crops: spring wheat, winter wheat. spring corn and summer corn were studied in field plot experiment. The results showed that the optimum rate of nitrogen recommended for spring wheat, winter winter wheat and summer corn had a Significant difference at different sites.and were considered to be 158. 7～187. 8kghm-2,100. 0 ～ 155. 4 kghm-2 and 121. 0 ～ 228. 0 kghm-2. respectively. The optimum rate of phosphate recommendation had a unsignificant difference except for the spring wheat which varied from 71. 9 to 94. 4kghm-2. Based upon the research. the rate of nitrogen topdressing could be guided by the means of quick nitrate test in plant tissue.