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本文报告了尿素粒肥在石灰性砂壤土上对夏玉米的效应及其氮素去向。在石灰性砂壤土上尿素粉肥条撒(雨前施肥或结合灌溉)可以起到尿素深施的作用。在供试土壤上施用尿素,肥料氮的淋洗程度是重2.17克的粒肥深施>重1.09克的粒肥深施>粉肥深施>粉肥条撒。但玉米地上部分吸收肥料氮的情况正好与肥料氮在土壤中的淋洗难易趋势相反。收获时玉米地上部分吸收利用了48.5%的肥料氮量,0—80厘米微区土壤中残留了17.6%,而氮肥损失(亏缺)为33.9%。
This paper reports the effect of urea fertilizer on summer maize and its fate of nitrogen on calcareous sandy loam soil. Upland fertilizer (calcareous or combined with irrigation) on calcareous sandy loam soil can act as a deep-seated urea. In the test soil application of urea, fertilizer leaching of nitrogen is heavy 2.17 grams of fertilizer deep application of fertilizer> 1.09 grams of granular fertilizer application of deep> fertilizer and fertilizer> fertilizer and fertilizer. However, the uptake of fertilizer N by corn shoots just happens to be opposite to that of fertilizer nitrogen leaching in soils. At the harvest, 48.5% of fertilizer N was absorbed and absorbed by the aerial parts of the maize, 17.6% of the 0-80 cm soil was retained in the soil and 33.9% of the loss (deficiency) of nitrogen was observed.