摘要
利用(15)~N示踪技术研究了硝酸磷肥的氮素效应,结果表明:①作基肥施用时,各种肥料对小麦的增产效果相同,但在小麦生长初期,不同肥料有不同的肥效,硝酸礴肥优于尿素重钙。②作物对肥料氮的吸收和利用取决于氮素形态,其顺序为:硝酸磷肥的 NO_2-N>磷铵态N>尿素态 N>硝酸磷肥的 NH_4-N。肥料氮的气态损失以硝态 N 损失最少,尿素态 N 次之,两年结果非常一致。
Pot experiment was conducted from 1987 to 1989 with wheat to study nitrogen efficiency of nitrophosphate by ^(15)N trace.The results showed:①When all fertilizers were applied to basal nutrient,nitrophosphate,urea+MAP and urea+ TSP gave signifcant effect of increasing the production of wheat.In the early growth stage,the effects of the fertilizer were different, nitrophosdhate was better than urea+TSP.②The utilization rate of fertilizer nitrogen by the crop depends on the nitrogen form,the order was.NO_a^- of nitrophosphate>NH_4H_2PO_4 >urea>NH_4^+ of nitrophosphate.③The loss rate of fertiliger nitrogen of nitrophos- phate,NO_3^- loss than uea.Two years results were very identical.
关键词
氮15
硝酸磷肥
肥效
^(15)N trace
nitrophosphate
fertilizer efficiency
