不同灌水量对土壤氮磷钾养分移动的影响

Effect of irrigation on nutrient movement of N, P and K in soil

在大田条件下,采用三室隔膜木箱试验研究了不同灌水量对土壤氮磷钾养分移动的影响。结果表明:灌水和施肥均有利于NO-3-N向根面迁移,而且在距根面0～5mm内NO-3-N有明显的累积现象;NH+4-N则相反,靠近根面土层出现最大亏缺率,随距根面距离的增加亏缺率减小,水分对NH+4-N迁移有明显影响的范围为0～30mm,大于30mm效果减弱;灌水量大,施肥充足,土壤磷、钾的扩散范围和扩散强度大,反之则小。

The field experiment has been conducted to investigate the effect of soil moisture condition on nutrient movement of N, P and K. The results showed that both irrigation and fertilizer application were benefical to the movement of NO-3-N to root surface, and NO-3-N was accumulated obviously within the scale of 0~5 mm. On the contrary, NH+4-N appeared to be deficient greatly near root surface, and the nearer distance, the lower deficient rate. The range obviously affected by soil moisture on NH+4-N movement was 0~30 mm . Under the condition of sufficient irrigation and fertilizer application, the expanding range and intensity of soil P and K was relatively large.\;