Effects of planting years of vegetable solar greenhouse on soil microbial flora and enzyme activities. Temporal variations of soil microbial biomass and enzyme activities during the secondary succession of primary broadleavedPinuskoraiensis forests in Changbai Mountains of Northeast China. Effects of different application rates of calcium cyanamide on soil microbial biomass and enzyme activity in cucumber continuous cropping. Effect of long-term fertilization on lignin accumulation in typical subtropical upland soil.


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