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Acta Prataculturae Sinica ›› 2023, Vol. 32 ›› Issue (6): 71-84.DOI: 10.11686/cyxb2022251

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Effects of phosphorus application and inoculation with arbuscular mycorrhizal fungi on alfalfa yield and phosphorus use efficiency

Xiao-xia AN1(), Ying-ying ZHANG1, Chun-hui MA1, Man LI2(), Qian-bing ZHANG1()   

  1. 1.College of Animal Science & Technology,Shihezi University,Shihezi 832003,China
    2.College of Medicine,Shihezi University,Shihezi 832003,China
  • Received:2022-05-15 Revised:2022-07-28 Online:2023-06-20 Published:2023-04-21
  • Contact: Man LI,Qian-bing ZHANG

Abstract:

In order to investigate the effects of phosphorus application and inoculation with arbuscular mycorrhizal fungi on dry matter yield, phosphorus content and soil alkaline phosphatase activity (AKP) of alfalfa, the soil available phosphorus and total phosphorus of alfalfa under different inoculation and phosphorus application regimes were analyzed. The relationship between alfalfa dry matter yield and inoculation and phosphorus application and the relationship between yield and various other indicators were further clarified. In this experiment, a two-factor completely randomized design was adopted. Four inoculation treatments were included: Single inoculation with Funneliformis mosseaes (Fm, T1), Glomus etunicatum (Ge, T2), double inoculation (Fm×Ge, T3) and no fungal treatment (CK, T0). As the second factor, four phosphorus application levels were included: P2O5 0 (P0), 50 (P1), 100 (P2), 150 (P3) mg·kg-1 making a total of 16 treatments defining the fungus-phosphorus interaction. Each treatment was repeated 10 times. It was found that: 1) With the same inoculation treatment, the dry matter yield, phosphorus content of leaves, stems and roots, soil pH value and alkaline phosphatase activity of alfalfa all initially increased first and then decreased with increasing phosphorus application. All reached the maximum value in the P2 treatment, and the yield of the alfalfa P fertilization treatment was significantly greater than the no P fertilization treatment (P<0.05). The content of available phosphorus and total phosphorus in rhizosphere and non-rhizosphere soil increased gradually with increasing phosphorus application rate, and the agronomic efficiency of alfalfa phosphorus fertilizer showed a decreasing trend with increase in phosphorus application rate. 2) With the same inoculation treatment, dry matter yield, phosphorus content of plant leaves, stems and roots, rhizosphere and non-rhizosphere soil available phosphorus, total phosphorus content, phosphorus use efficiency, soil alkaline phosphatase activity was significantly greater than that of uninoculated treatment (P<0.05), and the soil total phosphorus and available phosphorus contents were maximised in the T3 treatment. The pH value of soil in the double inoculation treatment was significantly lower than that in the uninoculated treatment (P<0.05), and reached the minimum value in the T3 treatment. Based on these results, the phosphorus application (P2O5) treatment of 100 mg·kg-1, coupled with the mixed inoculation of the two arbuscular mycorrhizal fungi could could be recommended and this treatment effectively promoted the absorption of available phosphorus in the soil by the roots of alfalfa plants, improved the efficiency of phosphorus use, and enhanced dry matter yield in alfalfa.

Key words: alfalfa, arbuscular mycorrhizal fungi (AMF), phosphorus, phosphorus utilization efficiency, phosphatase activity