Effects of straw composting on the number of functional soil microorganisms in the rhizosphere soil of maize
Straw composting altered the structure of soil microbial communities,but its effect on the number of functional soil microorganisms is unclear.In this study,0,2.5,5.0 and 7.5 t/hm2 of straw compost were buried and mulched to investigate the numbers of phosphorus-dissolving bacteria,potassium-dissolving bacteria,autochthonous nitrogen-fixing bacteria and combined nitrogen-fixing bacteria in rhizosphere soil at the ear and flower periods by the plate counting method.The result showed that except for 7.5 t/hm2 of burying treatment,straw compost significantly enhanced the number of functional microorganisms at the maize ear period,whereas the opposite results were observed at the flower period.Moreover,effects of 7.5 t/hm2 of straw composting on the functional microorganisms in the rhizosphere soil were correlated with the way of straw returned to soil and the period of maize development,and opposite changes in the number of functional microorganisms between the two return methods and the developmental stages of maize.
straw composting returning to the fieldphosphorus-dissolving bacteriapotassium-dissolving bacteriaautochthonous nitrogen-fixing bacteriacombined nitrogen-fixing bacteria
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