The effect of soil pH, phosphates, and phosphate solubilizing bacteria on the forms of soil phosphates and growth of maize (Zea mays L.)

Autor: Jia-Wei Lu, 呂嘉偉
Rok vydání: 2012
Druh dokumentu: 學位論文 ; thesis
Popis: 100
It has been known that most soil inorganic phosphates are in hard soluble forms and many researches using phosphate solubilizing microorganism to increase their availability to plants, however, their effects are not consistant. In this study, three acid soils (Hukou, Xinshe, and Daya) and two alkaline soils (Xiluo, and Xizhou) were used to investigate the transformation of soil phosphates after the adjust of soil pH and addition of different phospates and the effect of inoculation of phosphate solubilizing bacteria (Rhizobium lusitanum and Burkholderia cepacia) and phosphates (Ca3PO4, FePO4, and Rock P) on the growth of maize (Zea mays L.). Results showed that the rank order of P fractions was CBD-P or Fe-P > Al-P > Ca-P > Soluble-P in acidic soils (Hukou, Xinshe, and Daya), and Ca-P > CBD-P or Fe-P > Al-P > Soluble-P in alkaline soils (Xiluo and Xizhou). The acidification of Xiluo and Xizhou soils from original pH 7.4 to 5.6 and 5.8, respectively, decreased their Soluble-P and Ca-P concentrations 48-71 % and 25-56 %, meanwhile, increased Al-P and Fe-P concentrations 13-44 % and 39-276 %, respectively. The most part of added KH2PO4 (P3) of Hukou, Xinshe, Xiluo and Xizhou soils, their quantity used for each soil was measured according to their isothermal adsorption equation with equilibrium concentration of solution-P at 0.2 mg-P L-1, was mainly in form of Fe-P, Al-P, Ca-P and Ca-P with increased rate, relative to original concentration, at 25 %, 276 %, 17 % and 16 %, respectively. In pot experiments, the inoculation of phosphate-solubilizing bacteria had no significant effect on the dry weight and phosphorus concentration of maize shoot. The efficiency of FePO4 was highest among phosphorus fertilizers (Ca3PO4, FePO4, and Rock P) used, and the dry weight and P concentration of maize shoot of FePO4 treatment were increased 26-131 % and 50-622 %, respectively, compared to the control.
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