摘要
稻田中氮素淋失的主要形态是硝态氮而不是铵态氮，为此稻田施用氮肥会对地下水体环境构成潜在的硝态氮污染危险．在双季稻田中，硝态氮淋失呈现典型的二次曲线型季节性消长，早季的淋失高于晚季．在300公斤N／公顷施氮量和540mm排水量条件下，双季稻田中氮素淋失总量可达27公斤N／公顷，其中硝态氮占85％，铵态氮占15％．碳铵的氮素淋失高于尿素．包膜尿素可以有效减少氮肥的淋失．
A series of lysimetry experments were conducted on the large- undisturbed-monolith-lysimeters during the period 1991-1994 to determine the main form of nitrogen leachedfrom ricefields, the seasonal change of nitrogen leaching, the effect of nitrogen sources on nitrogenleaching losses and the nitrogen leaching load in double-rice-cropped ricefields.
出处
《浙江农业学报》
CSCD
1995年第3期155-160,共6页
Acta Agriculturae Zhejiangensis
