Effects of mixed sowing of seed and fertilizer on yield,enzyme activity,and soil microorganisms of summer maize
The effects of mixed sowing of summer maize seeds and controlled release fertilizers on summer maize yield,nutrition absorption of nitrogen,phosphorus and potassium,economic benefits of fertilization,enzyme activity and soil microorganisms were explored to provide technical support for labor-saving and simplified production of summer maize and reduce fertilizer application and increase the efficiency.A field experiment was conducted with summer maize variety'Zhengdan 958'.The experiment included four treatments:no nitrogen control,conventional fertilizer application,mixed sowing of seeds and controlled release fertilizers,and mixed sowing of seeds and controlled release fertilizers with 50%rate reduction of nitrogen,phosphorus and potassium.The yield,nutrition absorption of nitrogen,phosphorus and potassium,leaf enzyme activity and rhizosphere soil microbial function genes of summer maize were investigated.Compared with conventional fertilizer application,summer maize yield of RCF and RCF50 treatment was increased by 7.7%-22.1%,The absorption of nitrogen,phosphorus and potassium by summer maize were increased by 0.75%-33.3%,16.3%-27.1%and 4.78%-36.5%,respectively.The nitrogen recovery efficiency,nitrogen agronomic efficiency,nitrogen partial factor productivity were increased by 20.7%-24.6%,14.1-20.2 kg/kg and 14-74.1 kg/kg,respectively.And the net income per hectare of summer maize(excluding fertilizer input)was increased by 9.67%-19.6%compared to conventional fertilizer application,there was no significant difference of the gene number of nitrification and denitrification microorganisms in rhizosphere soil,nitrate reductase,glutamine synthetase,glutamic acid synthase,and glutamate dehydrogenase in leaves at silking stage.The contact application of controlled release fertilizer with summer maize seed achieved yield increase and income increase,improved nitrogen,phosphorus,and potassium nutrient absorption and nitrogen fertilizer utilization efficiency,and reduced environmental pollution risks.
summer maizecontrolled-release fertilizernitrogen use efficiencyenzyme activitymicrobial functional genes
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