利用^(15)N研究氮肥对土壤及植物内硝酸盐的影响  

INFLUENCE OF NITROGEN FERTILIZER ON NO_3 N IN BOTH SOIL AND PLANTS

作　　者：徐晓荣[1] 李恒辉[1] 陈良[1] 

机构地区：[1]河北省农林科学院理化研究所,石家庄050051

出　　处：《核农学报》2000年第5期301-304,共4页Journal of Nuclear Agricultural Sciences

摘　　要：利用15N研究了肥料氮在土壤中的转化以及作物吸收的氮在体内的代谢、积累的变化。结果表明 :施氮量越大 ,土壤及植物体内的硝态氮量越高 ;但随着作物的生长 ,硝态氮的含量又逐渐减少 ;过量施氮肥会造成土壤残留的硝态氮过高 ,不但对土壤造成污染 ,而且还会通过淋溶作用对地下水造成污染。The nitrificaion of nitrogen fertilizer in soil as well as its metabolism and transform in plants was studied by using 15 N. The results showed that the amount of NO - 3 N in soil and plants increased with the increase of nitrogen fertilizer amount, but decreased gradually with the growth of plants. Over application of N fertilizer as 300kg N/hm\+2 caused higher residual NO - 3 N in soil, which not noly harms soil but also pollutes groundwater by drip washing.In order to gain high production and alleviate pollution, a simple procedure was suggested to determine optimum amount of N fertilizer.

关 键 词：^15N示踪 氮肥 土壤硝酸盐 蔬菜硝酸盐 环境保护 

分 类 号：S147[农业科学—肥料学]