Research on Rational Application of Nitrogen and Phosphorus Fertilizer in Spring Corn Yield of North-central Shanxi Province

In view of the production feature of spring corn in north-central Shanxi,the paper carries on the matching test of nitrogen and phosphorus fertilizer,which shows that: When N:P2O5= 1:0.6,it is best of the effect of increased production of low yield field and medium yield field.When N: P2O5=1:0.8,it is best of the effect of increases production of high yield field.Meanwhile,there exists remarkable linear correlation between the corn grain's absorbed dose of fertilizer and grain yield.But after fertilizing fertilizer,there is an affinity between its utilization ratio and input amount.The utilization ratio of phosphorus fertilizer presents a downtrend along with the increase of nitrogen dose and the decrease of phosphorus dose.