稻田土壤中N的渗漏损失研究

Leaching loss of nitrogen in rice field

应用大型原状土柱渗漏计研究稻田中Ｎ渗漏损失的基本规律及其机制，初步探明硝态氮淋失是稻田土壤中Ｎ淋失的重要形式之一，双季稻种植期间的硝态氮淋失量可达２０ｋｇ·ｈａ－１，Ｎ肥用量及品种对Ｎ淋失有明显影响。

Studies on the regularity and mechanism of leaching loss of nitrogen in rice field show thatNO,-N leaching is the main loss of nitrogen leached from rice field, which reaches to 20kg N' ha-l during the planting of double-harvest rice. The sort of nitrogen fertilizer andits application rate have a strong effect on the leaching loss of nitrogen. It's suggestedthat the application rate of fertilizer N should be less than 150kg· ha-1 for each croppingof rice.