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Acta Prataculturae Sinica ›› 2025, Vol. 34 ›› Issue (7): 185-195.DOI: 10.11686/cyxb2024324

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Effects of nitrogen, phosphorus and potassium rationing on production performance and nutritional quality of Echinochloa frumentacea in saline soil

Ling-fei XIANG1(), Feng-ju ZHANG2, Dong-mei MA2, Jin-long LIU3, Jian LAN1, Jian-qiang DENG1, Hai-ying HU1, Bin WANG1, Chun-jiang CAI1, Qiao-li MA1()   

  1. 1.College of Forestry and Prataculture,Ningxia University,Yinchuan 750021,China
    2.College of Ecological Environment,Ningxia University,Yinchuan 750021,China
    3.Ningxia Qianyeqing Agricultural Science and Technology Development Co. ,Ltd,Pingluo 753400,China
  • Received:2024-08-26 Revised:2024-11-11 Online:2025-07-20 Published:2025-05-12
  • Contact: Qiao-li MA

Abstract:

The northern region of Ningxia has widely distributed saline and alkaline lands. Salinity, in turn, imposes limitations on use of land for crop and forage production, and such land typically has low soil fertility and low fertilizer response. These limitations seriously restrict the capacity for forage grass production in China. As a plant with wide adaptability and strong salinity tolerance, Hunan Jizi (Echinochloa frumentacea) is an important forage species for saline-alkaline land improvement and development of the forage and livestock industries. This experiment investigated the suitable fertilization rate for E. frumentacea on saline-alkaline land, using the ‘3414’ incomplete factorial experimental design to clarify the effects of different fertilization combinations of N, P and K on the production performance and nutritional quality of E. frumentacea. It was found that the average plant height of N2P1K1 (N: 180 kg·ha-1, P2O5: 45 kg·ha-1, K2O: 30 kg·ha-1) was 1.58 m. The average yields of fresh herbage and hay in treatment N2P1K1 were, respectively, 67.24% and 62.09% higher than those of the no-fertilizer treatment (P<0.05). Nitrogen-phosphorus-potassium fertilizer application significantly increased the nutritive value of Hunan Jizi, and the treatments with the highest crude protein and crude ash contents were N2P0K2 (N: 180 kg·ha-1, P2O5: 0 kg·ha-1, K2O: 60 kg·ha-1), with gains of 5.77% and 8.75%, respectively, compared to no fertilizer. Meanwhile, the relative feeding value and dry matter digestibility, total digestible nutrients, and net lactation energy were all highest under treatment N0P2K2 (N: 0 kg·ha-1, P2O5: 90 kg·ha-1, K2O: 60 kg·ha-1). Multivariate principal component analysis indicated the highest overall ranking was obtained under the treatment N2P1K1. Based on these results, the recommended fertilizer combination for growing Hunan Jizi on saline and alkaline land in northern Ningxia is: N 180 kg·ha-1, P2O5 45 kg·ha-1, and K2O 30 kg·ha-1.

Key words: Echinochloa frumentacea, combining application of nitrogen, phosphorus and potassium fertilizers, production performance, nutritional quality, comprehensive assessment