| Effects of nitrogen application rate on nitrogen accumulation and yield of intercropping potato plants |
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| DOI：10.7606/j.issn.1000-7601.2020.02.20 |
| Key Words: nitrogen application rate intercropping potato oats nitrogen utilization yield |
| Author Name | Affiliation | | CAI Ming | College of Agriculture, Ningxia University, Yinchuan, Ningxia 750021, China | | LIU Jili | College of Resources and Environment, Ningxia University, Yinchuan,Ningxia 750021, China | | YANG Yaya | College of Agriculture, Ningxia University, Yinchuan, Ningxia 750021, China | | HE Jinhong | College of Agriculture, Ningxia University, Yinchuan, Ningxia 750021, China | | Chang Wenwen | College of Resources and Environment, Ningxia University, Yinchuan,Ningxia 750021, China | | He Haifeng | College of Agriculture, Ningxia University, Yinchuan, Ningxia 750021, China | | WU Na | College of Agriculture, Ningxia University, Yinchuan, Ningxia 750021, China |
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| Abstract: |
| Aiming at the large scale continuous cropping of potato in the mountain area of southern Ningxia, the problem was obvious for low nitrogen utilization rate of potato, high incidence of late blight, and prominent contradiction of land use. A split experiment was used and the main treatment included four nitrogen application levels at 0, 75, 150, and 225 kg·hm-2, and the secondary treatment was potato single and potato oat intercropping. The effects of nitrogen application rate on nitrogen accumulation and yield of potato were studied. The results showed that the maximum nitrogen accumulation rate of potato was observed near the tuber formation stage while the maximum nitrogen accumulation rate of intercropping potato appeared near the tuber expansion stage. The nitrogen accumulation effect of 150 kg·hm-2 nitrogen application was better than that of other treatments. Under 150 kg·hm-2of potato single cropping treatment, NHI was higher than other treatments by 7.46%, 8.54%, and 6.11%, respectively. Under 150 kg·hm-2 of inter cropping treatment, NHI was higher than other treatments by 2.08%,8.87%, 2.40%, respectively. Compared with 75 kg·hm-2 and 225 kg·hm-2 nitrogen application，AE, PE and NUE of 150 kg·hm-2 were higher than other treatments by 33.98%, 49.08%, and 41.83%, 85.53%, and 55.15%, 94.83%, respectively, under intercropping condition. The difference was significant between nitrogen treatments in PE and NUE (P<0.05) and the AE was extremely significant difference under the intercropping mode (P<0.01).Compared with the control, the yield of nitrogen\|treated potato increased by 1.73%, 10.29%, and 3.97%, respectively, under single cropping mode with the increase of nitrogen application rate, while, under the intercropping mode, the yield of nitrogen\|treated potato increased by 8.68%, 31.23%, and 15.33%, respectively. Under the interaction of nitrogen application rate and intercropping planting pattern, yield of potato was significantly different (P<0.05).The effect of fertilization and yield increase of intercropped potato was greater than that of single cropping obviously. |
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