›› 2019, Vol. 31 ›› Issue (12): 1955-1962.DOI: 10.3969/j.issn.1004-1524.2019.12.02

• Crop Science • Previous Articles     Next Articles

Effects of potato-oats on nitrogen content and soil nitrogen in potato

YANG Yaya1, WU Na1,*, LIU Jili2, YANG Nana1, CAI Ming1, HE Haifeng1   

  1. 1. College of Agriculture, Ningxia University, Yinchuan 750021, China;
    2. Institute of Environmental Engineering, Ningxia University, Yinchuan 750021, China
  • Received:2019-05-28 Online:2019-12-25 Published:2019-12-25

Abstract: In order to improve the utilization of nitrogen fertilizer, this paper explored the effects of potato monocropping and three potato-oat intercropping patterns on potato nitrogen content and soil nitrogen by randomized block experiment, and selected the optimal intercropping model. The test material was Qingshu 9, and the potato single was used as the control (IP). Three intercropping patterns were set, and effects of different row ratios of potato : oats (2:2, 4:2, 4:8; labeled as P2O2, P4O2, P4O8) on nitrogen content in potato plants, soil total nitrogen, alkali nitrogen and inorganic nitrogen distribution were compared. The results showed that nitrogen content of potato leaves and stems decreased from flowering to maturity, while the nitrogen content of tubers increased. Nitrogen content of intercropped plants was significantly higher than that of single cropping treatment, among which intercropping P2O2 was the best. Contents of total nitrogen in the soil of 0-20 cm in the flowering stage were higher than that in the single cropping treatment, among which the intercropping P4O8 was the best, reaching 0.69 g·kg-1; and the maturity period was 24.6% higher than the flowering period. Content of alkaline nitrogen in 0-20 cm soil layer of P4O8 during flowering stage was higher than those of the other three treatments, which increased 19.2% compared with intercropping P2O2, maturity period increased by 41.7% compared to the flowering period. At the flowering stage, the content of nitrate nitrogen in the IP 0-20 cm soil layer was higher than those of other intercropping treatments, reaching 0.82 mg·kg-1, and the maturity period was 26.8% lower than the flowering period, but still higher than other intercropping treatments. At the flowering stage, content of ammonium nitrogen in the soil of IP 0~20 cm was higher than those of other intercropping treatments, reaching 0.35 mg·kg-1, and the maturity period was 2.9% lower than that of flowering stage, but still higher than other intercropping treatments. The results showed that intercropping P4O8 and P2O2 could significantly increase the contents of nitrogen, soil total nitrogen and alkali nitrogen in plants, and contents of nitrate nitrogen and ammonium nitrogen in potato monocropping soil were higher than that in intercropping. This indicated that the residual amount of mineral nitrogen in the soil under intercropping conditions was small, reducing the probability of nitrogen loss.

Key words: intercropping, potato, nitrogen content, soil nitrogen

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