摘要
采用3年田间小区肥料定位试验 ,研究了施氮量对1m土体硝态氮含量的影响。结果表明 ,每季施氮量小于225kg/hm2 时 ,1m土层中各测定时期硝态氮含量变化不大 ,在11.4～41.3kg/hm2 之间 ,当施氮量增加到375kg/hm2时 ,1m土层的硝态氮含量增加1.5～7.4倍 ;0～20cm和80～100cm土层硝态氮在每季施氮量大于225kg/hm2时急剧增加 ,并对地下水产生污染。
The Contents of nitrate-N at 1 metre depth of soil under different N fertilizer levels were determined in a fixed field experiment during 1996-1999. The results showed that the contents of nitrate-N in 1 metre soil layer varied little when the amount of N fertilizer application with less than 225 kg/h. per season, finding about 11.4～41.3 kg/h. It was discovered that the contents in either 0～20 cm or 80～100 cm increased greatly, when the N fertilizer application exceeded 225 kg/hm2. When the amount of N fertilizer application added to 375 kg/h, the contents increased by 1.5～7.4 times, resulting in pollution on the underground water.
出处
《农业环境保护》
CSCD
2000年第4期228-229,241,共3页
Agro-Environmental Protection
关键词
潮土
施氮量
地下水
硝态氮
土壤
化肥
环境污染
chao soil
amount of N fertilizer application nitrate-N
underground water
