ACTA AGRICULTURAE BOREALI-SINICA ›› 2020, Vol. 35 ›› Issue (1): 158-167. doi: 10.7668/hbnxb.20190187

Special Issue: Potato crops

• Resource and Environment·Plant Protection • Previous Articles     Next Articles

Effects of Planting Patterns and Nitrogen Application Rates on Agronomic Traits and Yield of Potato in Mountainous Areas of Southern Ningxia

CAI Ming1, HE Jinhong1, YANG Yaya1, WU Na1, LIU Jili2   

  1. 1. School of Agriculture, Ningxia University, Yinchuan 750021, China;
    2. Institute of Environmental Engineering, Ningxia University, Yinchuan 750021, China
  • Received:2019-09-25 Published:2020-02-28

Abstract: To study the effects of potato-oat intercropping and nitrogen application rates on agronomic traits and yield of potato and provide the theoretical basis for further study of nitrogen transport in intercropping system, a split zone design with three planting patterns(potato monocropping, oatmeal monocropping and potato-oat intercropping) and four nitrogen application levels(0, 75, 150, 225 kg/ha) were performed. The results showed that under the same planting pattern, the plant height, stem diameter, dry matter accumulation rate and chlorophyll(SPAD) of the nitrogen-treated potato showed a trend of increasing first and then decreasing with the promotion of growth period, and the effect of nitrogen application was higher than that of intercropping. Nitrogen application could significantly increase the potato yield compared to no nitrogen application. The increase amount of intercropping was greater than that of monocropping. The contribution of nitrogen application to yield was greater than that of intercropping. Compared with the control, the yield of monocropping nitrogen treatments increased by 1.73%, 10.29% and 3.97%, respectively, while the yield of intercropping nitrogen treatments increased by 8.68%, 31.23% and 15.33%, respectively. Under the interaction of nitrogen application level with intercropping planting mode, the difference of yield was significant(P<0.05). Without nitrogen application, the yield of intercropping was lower than that of monocropping, which might be caused by interspecific competition between the two crops. Under different nitrogen application levels, the land equivalent ratio(LER) of the intercropping system was greater than 1, the intercropping advantage was obvious, the interspecific competition of potato-oat intercropping was less than 0, the competitiveness of oats was stronger than that of potato, and the yield of potato was positively correlated with the number of tubers per hole, the quality of each potato and the number of big tuber. In general, planting patterns and nitrogen application levels had an impact on potato agronomic traits and yield, and the contribution of nitrogen application was higher than that of planting mode.

Key words: Potato, Planting mode, Intercropping, Nitrogen application, Yield, Agronomic traits

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Cite this article

CAI Ming, HE Jinhong, YANG Yaya, WU Na, LIU Jili. Effects of Planting Patterns and Nitrogen Application Rates on Agronomic Traits and Yield of Potato in Mountainous Areas of Southern Ningxia[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2020, 35(1): 158-167. doi: 10.7668/hbnxb.20190187.

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