Correlations Between Biological and Chemical Fertilities of Soil in Maize Conservation Tillage

The correlations among soil enzyme activities,soil nutrient and variations of microflora were investigated at black soil area of central Jilin during different developmental stages of maize.Soil urease activity was significantly correlated with soil total N and total P contents(P≤0.01) at post-harvest stage and pH(P≤0.01) after filling stage.As well as,soil urease was significantly correlated with alkali-hydrolyzable N(P≤0.05) at pre-planting,jointing and post-harvest stages.However,soil urease showed no significant correlations with available P,K contents and no correlations with the amount of soil microflora,respectively.Soil phosphatase(acid,alkaline and neutral) activities were significantly correlated with soil total N(P≤0.05) and total P(P≤0.01) during the main development stages of maize.As well as,soil phosphatase(acid,alkaline and neutral) activities showed relatively significant correlations with available P,K contents and pH(negative) except filling stage.It means that,activities of soil phosphatase were mostly infected by the distribution of soil nutrient and pH values.Soil phosphatase activities were significantly correlated with soil microflora(P≤0.01) at pre-planting stages and no continuous regularity correlations were investigated at the end of maize growth.Soil enzyme activities showed relative significant correlation with soil organic matters.While no significant correlation was investigated with soil total K content.