【摘要】 应用¹⁵N核素示踪技术,研究了不同氮肥种类对苋菜硝酸盐积累与分配的关系及氮素的去向。结果表明:（1）苋菜可食部分中茎较叶更易富集硝酸盐,茎中硝酸盐含量为叶中的1.5倍左右,施用硝态氮肥苋菜叶与茎中的硝酸盐含量都偏高。（2）苋菜硝酸盐主要来源于土壤,达到80%以上,而来自肥料部分不足20%。（3）苋菜施用尿素其肥料利用率达到46.27%,土壤残留氮素达到17.01%,均高于硫铵与硝酸钠,尿素损失率为40.32%,远低于硫铵与硝酸钠,表明施用尿素有利于土壤氮素储量的保持和提高。更多还原

【Abstract】 By the application of ¹⁵N tracer technique,we studied studies the influence of different fertilizers related to the accumulation and distribution of amaranth nitrate and the destination of nitrogen.It shows that:Firstly,amaranth stem has more nitrate contents than those of leaf among the edible parts.The nitrate contents in the stem are 1.5 times as much as those of the leaf.Therefore,if fertilizing nitric nitrogen fertilizer,the contents of nitrate in leaf and stem are both a little high.Secondly,more than 80%amaranth nitrate comes from soil,while less than 20%from the fertilizers. Thirdly,urea is good to maintain and improve the nitrogen storage in soils.When urea is added to soils,the rate of its fertilizer utilization reached 46.27%and the rate of its soil residual nitrogen reached 17.01%,which are higher than those of ammonium sulfate and sodium nitrate.The loss rate of urea is 40.32%,which is much lower than those of ammonium sulfate and sodium nitrate.更多还原