典型黑土春玉米化学肥料养分利用效率变化研究
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Nutrients Use Efficiency Change of Chemical Fertilizers for Spring Maize in a Typical Black Soil
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图4. 2014—2016年不同处理0—90 cm 土壤剖面播种前(春)和收获后(秋)NO3--N、NH4+-N和Nmin浓度 |
Fig. 4. NO3--N, NH4+-N and Nmin concentration above 90 cm soil depth at pre-sown(spring) and post-harvested(autumn) in different treatments from 2014 to 2016 |
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