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典型黑土春玉米化学肥料养分利用效率变化研究
仇少君1,李宁1,何萍1,魏丹2,3,金梁2,赵士诚1,徐新朋1,周卫1
Nutrients Use Efficiency Change of Chemical Fertilizers for Spring Maize in a Typical Black Soil
QIU ShaoJun1, LI Ning1, HE Ping1, WEI Dan2,3, JIN Liang2, ZHAO ShiCheng1, XU XinPeng1, ZHOU Wei1

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
短横线表示每层土壤不同处理LSD0.05显著水平

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
Horizontal lines denote the significant difference at LSD0.05 level in each soil depth among different treatments