氮肥施用与蔬菜硝酸盐积累的相关研究

蔬菜是一种容易富集硝酸盐的作物，人体摄入的硝酸盐有８１．２％来自蔬菜，而 酸盐是强致癌物－－－亚硝胺的前体物。硝酸盐在一定条件下可墨迹为亚硝酸盐，对人体前直接破坏血红蛋白中的Ｆｅ＾２＋等危害。为获高产，不合理地超量施用化学氮肥，使得蔬菜硝酸盐积累量剧增，品质退化。研究表明：筛选出氯化铵、硫酸铵两种氮肥品种，氮素施用剂量以３００ｋｇ／ｈｍ＾２为临界值；氮肥施用安全始期以施氮后８ｄ为宜；化学氮肥与有机

STUDIES ON CORRELATION BETWEEN VEGETABLE NITRATE ACCUMULATION AND FERTILIZER APPLICATION

Vegetable is the crop which can easily enrich nitrate.In order to obtain a high yield of vegetable,farmers now excessively apply chemical nitrogenous fertilizer,thus resulting in a drastic increase in nitrate accumulation and vegetable quality deteriorated.In our study two kinds of fertilizers,ammonium chloride NH 4Cl and ammonium sulphate (NH 4) 2SO 4 were selected for correlation.It was proposed to apply N.fertilizer at a dose of 300kg/hm 2 as critical proper level to set a safe initial period adequately 8 days after application,and to incorporate chemical fertilizer with yard manure.These measures should be able to control and decrease the nitrate accumulation in vegetable so that the potential harm to human health be reduced and the quality of vegetable be raised.