不同降水状况下旱地玉米生长与产量对施氮量的响应

宁芳,张元红,温鹏飞,王瑞,王倩,董朝阳,贾广灿,李军

Responses of maize growth and yield to nitrogen application in dryland under different precipitation conditions

Fang NING,Yuan-Hong ZHANG,Peng-Fei WEN,Rui WANG,Qian WANG,Zhao-Yang DONG,Guang-Can JIA,Jun LI

表3 不同施氮量处理下春玉米产量构成因素及经济效益

Table 3 Yield and its components and economic benefits of spring maize under different nitrogen application rates

施氮量 N rate 穗数 Spike number 穗粒数 Kernels per spike 百粒重100-kernel weight (g) 籽粒产量 Grain yield (kg hm-2) 生物量 Biomass (kg hm-2) 收获 指数 HI (%) 边际产量 MP (kg N-1) 边际成本 MC (Yuan kg-1) 边际收益 MR (Yuan kg-1) 2016 N0 60224 520 e 31.97 c 9983 18220 54.74 b — — — N75 63545 545 b 31.66 d 10947 20132 54.11 c 964 0.3351 1.1888 N150 67750 543 c 32.18 b 11882 21397 55.45 a 935 0.3407 1.2512 N270 68279 550 a 32.47 a 12192 21934 55.72 a 194 0.5269 1.1000 N360 69860 532 d 32.09 b 11923 22222 53.49 d -224 0.8000 0.7763 平均Average 65932 538 32.07 11385 20781 54.70 — — — 2017 N0 56873 145 e 26.79 e 2209 13257 16.71 d — — — N75 53333 165 d 31.67 d 2780 17345 16.03 e 571 0.4536 1.1261 N150 58347 235 a 32.74 c 4482 18097 24.72 a 1702 0.2275 1.3625 N270 56667 209 b 34.88 a 4121 19839 20.74 b -226 0.4869 1.1025 N360 50000 208 c 32.93 b 3426 18354 18.67 c -579 1.0197 0.5735 平均Average 55044 192 31.80 3404 17378 19.37 — — — 2018 N0 63505 420 e 25.17 e 6718 19451 34.54 d — — — N90 68331 543 d 26.10 d 9675 21420 45.17 a 2463 0.1050 1.4950 N180 64429 551 c 27.68 a 9821 22286 44.07 ab 122 0.2000 1.4000 N270 65884 559 a 27.43 b 10102 23231 43.48 b 234 0.2752 1.3248 N360 63657 557 b 26.56 c 9411 24334 38.68 c -575 0.4610 1.1390 平均Average 65161 526 26.59 9145 22144 41.19 — — —