Effect of the Natural Soil Moisture Conditions in Songnen Plain on Maize Yield and the Correlative Analysis

Songnen plain was selected as the researched area,the soil-moisture in fixed maize area and corresponding maize yield was selected as researched object.This paper analyzed the distributing status of 0-50 cm soil layers soil average weight water content during maize growing season and every layers weight water content during mainly bearing period,at the same time,analyzed the affirmative and negative effect of soil-moisture and maize per unit yield by using the integral regression method.The results were as follows,during maize mainly growing period,the 0-50 cm soil layers soil average weight water content in heading stage was least,which in planting and seedlings stage was bigger;the distributing status of every layers weight water content during mainly bearing period was consistent with 0-50 cm soil layers average value,but soil layers value of 31-50 cm every layers weight water content was bigger than which in 0-10 cm and 11-20 cm.The weight water content and output of Songnen plain maize during growing season period were negative effect in seedlings,ripen stage and mature and which were positive effect in planting,three leaves,seven leaves,jointing and heading stage;during growth stage of maize,weight water content was least in heading stage and which was most in plantings and seedlings stage.