Organic Fertilizers Affect Phosphorus Speciation in Rhizosphere and Vegetable Growth

doi:10.11924/j.issn.1000-6850.casb17100027

Abstract

Abstract: This paper focuses on soil phosphorus (P) activation in vegetable field in south China. A field experiment was conducted to investigate the effects of different types of organic fertilizers on phosphorus (P) transformation and vegetable growth in typical vegetable soils, thus to provide a theoretical basis and technical support for soil P activation. The results showed that both organic fertilizer and bio- organic fertilizer application raised the yield of pakchoi (Brassica chinensis L.), and the yield increased most in the treatment of Organic II (chicken manure) and Bio-organic II (chicken manure + iron reducing bacteria), and Resin-P was significantly (P<0.05) higher in the two treatments than that in organic fertilizer treatment and CK. NaHCO3-Pi was significantly (P<0.05) higher in the two treatments than that in the treatment of Organic II, while NaHCO3-Po was not significantly (P>0.05) different between the treatments. Both organic and bio- organic fertilizer application increased NaOH-extracted P which was of medium activity. NaOH-Pi was significantly (P<0.05) higher in the treatment of Bio-organic I (peanut bran+iron-reducing bacteria) than that in other treatments, while NaOH-Po was not significantly (P>0.05) different between the treatments. Both organic fertilizer and bio-organic fertilizer application decreased stable P. Except residual-P, D.HCl-Pi, C.HCl-Pi, and C.HCl-Po were significantly (P<0.05) different between the treatments, and the largest decrease was found in the treatment of Organic II and Bio-organic II. Correlation analysis showed that resin-P was significantly (P<0.05 or P<0.01) and positively related to NaHCO3-Pi, NaHCO3-Po, and NaOH-Pi; NaHCO3-Pi was significantly (P<0.05 or P<0.01) and positively related to NaHCO3-Po and NaOH-Pi; and NaHCO3-Pi was significantly (P<0.05) and negatively related to C.HCl-Po. In summary, application of organic fertilizer and bio-organic fertilizer can lower the content of stable P but raise the content of active and medium active P, with the effect of bio-organic fertilizer being the best.

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