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Acta Prataculturae Sinica ›› 2022, Vol. 31 ›› Issue (10): 64-74.DOI: 10.11686/cyxb2021378

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Effects of phosphorus application on the growth and salt resistance of switchgrass under saline alkali conditions

Hai-feng HE1(), Na WU1, Ji-li LIU1,2,3(), Xing XU1   

  1. 1.College of Agriculture,Ningxia University,Yinchuan 750021,China
    2.College of Resources and Environmental Science,Ningxia University,Yinchuan 750021,China
    3.Key Laboratory for Degenerated Ecosystem in Northwest China under the Ministry of Education,Ningxia University,Yinchuan 750021,China
  • Received:2021-10-19 Revised:2021-12-29 Online:2022-10-20 Published:2022-09-14
  • Contact: Ji-li LIU

Abstract:

This study investigated the effects of different levels of phosphorus application on the growth, development and drought resistance of switchgrass (Panicum virgatum) in the saline area of Yinbei, Ningxia. In a field experiment two ecotypes of switchgrass, “Alamo” and “Pathfinder” were compared at three levels of phosphorus application: No phosphorus (P0), low phosphorus (30 kg·ha-1 P2O5) and high phosphorus (90 kg·ha-1 P2O5). There were three replications for each treatment. Changes in growth indexes, osmoregulatory substances and antioxidant enzyme activities were analyzed and compared at different stages of the reproductive period, and the switchgrass drought resistance was evaluated using the affiliation function method. It was found that with increasing phosphorus application levels, agronomic traits including as plant height, tiller number, leaf area index, dry matter accumulation and biological yield, and physiological characteristics such as SPAD value, malondialdehyde, soluble sugar content and peroxidase activity showed a general trend of gradual increase in both ecotypes. Compared to the P0 treatment, the above nine parameters were increased by 7.74%, 10.21%, 14.64%, 11.88%, 22.22%, 3.85%, 74.29%, 14.70% and 57.77%, respectively. In the multivariate analysis, the mean value of the membership function for each drought tolerance index was largest under the low phosphorus treatment. Therefore, 30 kg·ha-1 P2O5 equivalent is the ideal phosphorus application to improve the physiological characteristics, biological yield and salinity resistance of both ecotypes in this experiment.

Key words: phosphorus application level, saline alkali land, switchgrass, salt tolerance, membership function value