Effects of Slow-release N Fertilizer on Summer Maize Yield and Nitrogen Metabolism in Lime Concretion Black Soil
In order to clarify the nitrogen metabolism and changes of yield of summer maize at lime concretion black soil area,the application range of slow-release nitrogen fertilizer was explored.The experimental materials for this study were the corn variety'Beiqing 340'and sulfur-coated urea.Five levels of nitrogen fertilizer were set:no ni-trogen fertilizer(C0),70 kg/hm2 of slow-release nitrogen fertilizer(C70),140 kg/hm2 of slow-release nitrogen fer-tilizer(C140),210 kg/hm2 of slow-release nitrogen fertilizer(C210),and 280 kg/hm2 of slow-release nitrogen fer-tilizer(C280).Phosphate and potash fertilizers were applied according to a unified standard.The study aimed to test and analyze the effects of slow-release nitrogen fertilizer on nitrogen uptake,accumulation,transportation,and as-similation in summer corn in the lime concretion black soil area.The results showed that with the increase of slow-release nitrogen application rate,the nitrogen uptake,accumulation,transportation,and assimilation of corn organs showed a trend of first increasing and then decreasing after the tasseling stage.The correlation between or-gan nitrogen uptake,accumulation,transportation,assimilation,and yield varied.It was negatively correlated with the nitrogen accumulation during the tasseling to milk stage and the nitrogen accumulation in mature leaves,while positively correlated with other factors.At the same time,there was a significant linear correlation between organ nitrogen accumulation and transportation and yield characteristics.Based on the standard of reducing fertilizer and increasing efficiency,it was found that 210 kg/hm2 of slow-release nitrogen fertilizer was the optimal fertilization amount for summer corn in the lime concretion black soil area.This study provides a reference for reducing fertilizer and increasing efficiency in the production of summer corn in the lime concretion black soil area.
Slow-release nitrogen fertilizerLime concretion black soilSummer maizeNitrogen metabolismYield
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