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采用二因素三水平完全设计,通过保护地低压节点渗灌番茄小区栽培试验,研究了灌溉上限和施肥量组合处理在灌溉追肥后第1、2、35、、7 d不同土层土壤硝态氮的动态变化。结果表明,较低灌溉上限,施肥量对不同时间土壤硝态氮影响不明显;提高灌溉上限,施肥量增加影响土壤剖面分异。灌溉上限和肥料对土壤硝态氮累积量的影响除第一天外均达到5%显著水平,作用由大到小分别为肥料,水分,水肥交互作用。不同采样时间0～20 cm土层硝态氮累积百分比平均在50%以上,低灌溉上限和高施肥量组合的硝态氮累积百分比最大,高灌溉上限和高施肥量组合硝态氮累积百分比最小。
Using two factors and three levels of complete design, through the protection of low-pressure node infiltration tomato cell cultivation experiments to study the irrigation upper bound and fertilizer combination of irrigation top dressing in the first, second, fifth, seventh days of soil nitrate nitrogen Dynamic changes. The results showed that lower irrigation upper limit and fertilizer application had no obvious effect on soil nitrate nitrogen at different times. Increasing irrigation upper limit and increasing fertilization affected soil profile differentiation. The effects of irrigation upper limit and fertilizer on soil nitrate accumulation reached 5% except the first day, and the effect was from fertilizer to water and from fertilizer to water. The average percentage of accumulation of nitrate nitrogen in 0 ~ 20 cm soil layer was above 50% at different sampling times. The combination of high irrigation and high fertilizer combination had the highest accumulation of nitrate nitrogen, the lowest accumulation of high irrigation and high fertilizer combination .