施氮水平及施氮方式对稻田土壤渗漏水三氮浓度影响

针对当前氮素不合理使用造成地下水严重污染等一系列事件,明确稻田施肥水平及施肥方式对稻田氮素随渗漏水下渗流失的影响,探求当季氮素流失情况具有积极意义。采用自制盆栽模拟大田土壤渗漏情况,收集渗漏水并分析稻田养分流失量。结果表明:表施肥可以减少9.87%的铵态氮渗漏损失,混施肥可以减少5.92%的铵态氮渗漏损失,但是表施肥又增加了铵态氮的气态损失,且随着施氮水平的提高损失程度加深,渗漏水中硝态氮浓度大于铵态氮浓度,渗漏水中总氮的浓度受施肥方式影响较大。混施肥使得深施和表施的缺点得以避免,是一种合理的施肥方式,在田间作业时可将肥料机械性的搅拌到土壤当中,增加土壤地力。

Effect of Nitrogen Levels and Nitrogen Application Modes on Three Nitrogen Concentration of Paddy Soil Percolating Water

In view of the current unreasonable use of nitrogen pollution serious and a series of events, to clear paddy fertilizer and fertilization on rice nitrogen with infiltration of seepage erosion, the exploration of nitrogen loss in the quarter has positive significance. Homemade pot was adopted to simulate the soil seepage field, seep- age of collection, rice paddy nutrient loss was analyzed. The results showed that table fertilization could reduce 9.87% of ammonium nitrogen leakage loss,and mixed fertilizers could reduced by 5.92% of ammonium nitro- gen leakage loss, but the table fertilization increased ammonium nitrogen gas loss, and with the increasing of ni- trogen level loss degree deepen,seepage in the ammonium nitrate nitrogen concentration was greater than the nitrogen concentration,the concentration of total nitrogen in water leakage was greatly influenced by fertiliza- tion way. Mixed fertilizer avoided the shortcomings which was a way of reasonable fertilization, fertilizer could work in the field of mechanical agitation to the soil, and increased soil fertility.