摘要
利用渗漏池研究了氮肥品种、用量对３种紫色土中ＮＯ３－Ｎ移动和淋失的影响。结果表明，旱作小麦生长期间淋失氮素主要是ＮＯ３－Ｎ，苗期是ＮＯ３－Ｎ移动最强的时期，下移后主要分布于２０～６０ｃｍ土层，以后各层中ＮＯ３－Ｎ逐渐稳定。生育至４０天时，出现浅层地下水的ＮＯ３－Ｎ污染，说明减少追肥用量可减少污染。
The effects of N fertilizer rate and variety on the migration and leaching loss of NO3N in three purple soils were studied in percolating pools. The results showed that during the growing period of the dryland crop wheat N leached mainly as NO3N, and NO3N showed strongest migration at the seedling stage of the plants and was distributed chiefly in the 2060 cm layer, whereafter it became gradually stable. NO3N pollution of the shallow groundwater was observed 40 days after seedling emergence, suggesting that reducing N topdressing rates can decrease NO3N pollution.
出处
《西南农业大学学报（自然科学版）》
CSCD
1999年第3期228-232,共5页
Journal of Southwest Agricultural University
关键词
氮肥
紫色土
移动
淋失
nitrongenous fertilizers
purple soils
translational motion
leaching loss
