秸秆还田和氮肥用量对冬小麦产量和氮素利用的影响

王新媛,赵思达,郑险峰,王朝辉,何刚

Effects of Straw Returning and Nitrogen Application Rate on Grain Yield and Nitrogen Utilization of Winter Wheat

WANG XinYuan,ZHAO SiDa,ZHENG XianFeng,WANG ZhaoHui,HE Gang

表2 2011-2018年冬小麦-夏玉米轮作体系表观氮素平衡

Table 2 Apparent N balance of winter wheat-summer maize rotation system during 2011 to 2018 (kg·hm-2)

氮平衡 N balance 项目 Item 秸秆不还田 Control 秸秆还田 Straw returning N0 N84 N168 N252 N336 N0 N84 N168 N252 N336 氮输入 N input 种子氮Seed N 5 5 5 5 5 5 5 5 5 5 化肥氮Fertilizer N 0 84 168 252 336 0 84 168 252 336 秸秆还田带入氮 Straw N 0 0 0 0 0 29 29 29 29 29 干湿沉降1） Dry and wet deposition 18 18 18 18 18 18 18 18 18 18 氮输出 N output 籽粒氮携出 Grain N uptake 104 139 163 157 157 100 136 153 169 159 秸秆氮携出 Straw N uptake 34 40 41 41 40 32 38 41 44 42 氮盈余N surplus -114b -71b -13b 78b 162b -80a -38a 26a 92a 187a