Effect of Different Textural Soils on Rhizosphere Microorganisms and Enzyme Activities in Maize

【Objective】The number of 3 rhizosphere microorganisms(bacteria,fungi,actinomycete) and 5 enzyme(catalase,protease,urease,phosphatase,invertase) activities were studied during the whole life of corn plant in sandy loam,loam and clay soil textures.【Method】Using Yedan22,the number of 3 rhizosphere microorganisms and 5 enzyme activities with different textural soils were investigated in a pond.The correlations among them were analyzed.【Result】The main results were as follows: before seeding,the number of microorganisms were largest in sandy loam and smallest in clay.Enzyme activities were highest in clay and lowest in sandy loam.In the 3 soil textures the dynamic change of rhizosphere microorganisms and enzyme activities both turned on a parabola with the peak in the silking stage,and then reducing gradually.In silking stage,the number of the 3 microorganisms were largest in loam and smallest in clay;and the 5 enzyme activities were highest in loam and lowest in sandy loam.At maturity,the number of bacteria and actinomycete were largest in loam and smallest in clay,while the number of fungi were largest in loam and smallest in sandy loam.The catalase activity was highest in clay and lowest in sandy loam,while the rest four were all highest in loam and lowest in sandy loam.【Conclusion】In conclusion,the number of rhizosphere microorganisms and enzyme activities were affected by both the development of corn and soil texture.