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Acta Prataculturae Sinica ›› 2021, Vol. 30 ›› Issue (3): 215-223.DOI: 10.11686/cyxb2020047

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Effects of chemical fertilizer reduction and co-application with a JUNCAO nitrogen-fixing biofertilizer on growth and nutritional quality of Pennisetum giganteum and soil nutrient status

Yu-lei JIA1,2(), Zhen LIAO1,2(), Li-fang WANG1,2, Jian-chao BU1,2, Biao-sheng LIN1,2,3, Hui LIN1,2, De-wei SU1,2, Guo-dong LU1,2, Zhan-xi LIN1,2()   

  1. 1.College of Life Science,Fujian Agriculture and Forestry University,Fuzhou 350002,China
    2.National Engineering Research Center of Juncao,Fuzhou 350002,China
    3.College of Life Science,Longyan University,Longyan 364012,China
  • Received:2020-02-05 Revised:2020-10-10 Online:2021-03-20 Published:2021-03-09
  • Contact: Zhan-xi LIN

Abstract:

Biological N-fixation offers potential for a significant role in plant cultivation and reduction in chemical fertilizer use. The aim of this research was to study the effect of JUNCAO nitrogen-fixing bacterial isolates on the growth, nutrient quality and soil nutrient of Pennisetum giganteum. JUNCAO nitrogen-fixing biofertilizer was produced using endogenous nitrogen-fixing bacterial strains isolated from the roots of P. giganteum. A field trial was carried out with a randomised complete block design and five treatments: no fertilizer (blank control, CK0), sterilized JUNCAO nitrogen-fixation biofertilizer (substrate control, CK1), a full rate of chemical fertilizer (FHF), JUNCAO nitrogen-fixation biofertilizer (T1), JUNCAO nitrogen-fixation biofertilizer together with a 75% rate of chemical fertilizer (T2). Our results showed that compared with no fertilizer, the application of JUNCAO nitrogen-fixing biofertilizer alone and JUNCAO nitrogen-fixing biofertilizer with a 75% rate of chemical fertilizer treatment significantly boosted plant growth and yield, and improved the forage quality and soil physical and chemical properties in stands of P. giganteum. Compared with the full-rate chemical fertilizer application, application of JUNCAO nitrogen-fixing biofertilizer alone reduced the yield, the herbage crude fiber, lignin, and crude ash contents and soil alkaline hydrolysable nitrogen, available phosphorus, available potassium, and the soil organic matter levels of P. giganteum to different degrees. However, for the treatment of JUNCAO nitrogen-fixing biofertilizer with a 75% rate of chemical fertilizer the number of leaves, the tiller number, herbage crude protein, crude fiber, acid detergent fiber, lignin and crude ash content of P. giganteum were significantly higher than that of single application of chemical fertilizer, while the yield, plant height, crude fat content and soil alkaline hydrolysable nitrogen, available phosphorus, available potassium, and organic matter content of P. giganteum were higher than those at the full rate of chemical fertilizer but the differences were not significant. The neutral detergent fiber level was significantly lower than that of the full rate of chemical fertilizer. In summary, tactically reducing the application rate of chemical fertilizer combined with application JUNCAO nitrogen-fixing biofertilizer (a 75% rate of chemical fertilizer+JUNCAO nitrogen-fixing biofertilizer) showed indications of improved crop vigor in P. giganteum, and also significantly improved the herbage nutritional quality and soil nutrient status of P. giganteum to a moderate degree.

Key words: JUNCAO nitrogen-fixing biofertilizer, Pennisetum giganteum, yield, nutritional quality