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Acta Prataculturae Sinica ›› 2013, Vol. 22 ›› Issue (5): 104-112.DOI: 10.11686/cyxb20130512

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Effects of bio-fertilizers with different PGPR strain combinations on yield and quality of alfalfa

HAN Hua-wen1,2, SUN Li-na1,3, YAO Tuo1,2,4, RONG Liang-yan1,5, LIU Qing-hai1,2, LU Hu1,2, MA Hui-ling1,2   

  1. 1.College of Pratacultural Science, Gansu Agricultural University, Lanzhou 730070, China;
    2.Key
    Laboratory of Grassland Ecosystem, Ministry of Education, Lanzhou 730070, China;
    3.Forest Bureau of Wuwei City, Wuwei 733000, China;
    4.Sino-U.S.Centers for Sustainable Development of Grassland and Animal Husbandry, Lanzhou 730070, China;
    5.Grassland Promoting Station of Gansu province, Lanzhou 730070, China
  • Online:2013-10-20 Published:2013-10-20

Abstract: In recent years, bio-fertilizers have emerged as an important component of the integrated nutrient supply system and hold great promise to improve crop yields because increasing use of chemical fertilizers and high productive systems are creating environmental problems. The effects of different combinations of PGPR strains on yield and quality of alfalfa (Medicago sativa) were studied in randomized block field experiments using bio-fertilizers. These were produced using different combinations of three phosphate solubilizing bacteria (Bacillus sp., Pseudomonas sp. and Azotobacter sp.) and one rhizobium (Sinorhizobium meliloti) strain isolated from the rhizosphere of alfalfa and wheat. Hay yield and quality of alfalfa decreased when treated with mono-strain bio-fertilizer (containing 50% phosphatic fertilizer) compared with the control (100% phosphatic fertilizer) although there was no significant difference. Hay yield, content of crude protein (CP), calcium, phosphate and ether extract (EE) increased 10.6%, 16.4%, 14.1%, 11.9% and 4.2% respectively, while acid detergent fiber (ADF) and neutral detergent fiber (NDF) were reduced by 10.9% and 7.7%. The benefit of mono strain bio-fertilizer was inferior to that of mixed strain bio-fertilizer. Strains S7 and Jm170+Jm92+Lx191+S7 with 50% phosphatic fertilizer are recommended as the best treatments to substitute for 100% phosphatic fertilize in alfalfa production.

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