Effects Of Nitrification Inhibitor On Nitrogen Transformation Of Urea And Nitrogen Utilization And Yield Of Maize

According to statistic, the used amount of fertilizer in unit area of our country is 2.7 times than the average lever of world, ecological and environmental pressures are growing, too. Absorption of traditional fertilizer is decreasing year by year. It is an inevitable trend to develop new type of fertilizer. The use of nitrification inhibitor can slowdown the process of soil nitrification, provide nutrient corn needed, meanwhile guarantee environmental security in a maximum extent. The experiment aiming at the study on nitrification inhibitor used on the maize in black soil region of Heilongjiang province, to explore the effects of mixed nitrification inhibitor on soil nitrogen transformation, soil p H and gave analysis of nitrogen accumulation, yield and quality with total fertilization disposable and top dressing, Got the best proportion of mixed nitrification inhibitor.Changes of soil ammonia and nitrate nitrogen in the seedling stage were obvious, contents of soil ammonia and nitrate nitrogen in seedling stage reached the highest of treatments used nitrification inhibitor. Contents of soil ammonia and nitrate nitrogen in the late growth stage were essentially consistent because of pyrazole nitrification inhibitor were easier to be adsor bed by soil colloid, therefore it was an obviously trend that contents of soil ammonium and nitrate nitrogen in seedling stage were highest and decreased later with or without nitrification inhibitor. Soil nitrification obviously reduced because of nitrification inhibitor an d reached significant differences with TP and AF treatments.Change of soil p H was 5.5~7.0, nitrification inhibitor could decrease soil p H stepwise obviously. In this range, the decrease of soil p H could slowdown the speed of ammonium nitrogen transform to nitrate nitrogen, activated phosphorus fixed by soil colloid, reduced volatilization of ammonia. In the correlation analysis, we found that soil pH and nitrification was high significant positive correlation, the correlation coefficient was 0.5697**, soil p H and soil ammonium nitrogen was high significant negative correlation, the correlation coefficient was-0.4962**. Soil moisture content, soil pH and nitrification were closely related, reached high significant negative linear correlation. Combined the climate characteristics of “rainy and hot together” in Heilongjiang province and soil moisture content reached highest at anthesis stage, we holding that in month 5-8, increase of soil moisture content and soil temperature accelerated decomposition speed of nitrification inhibitor by microorganism. Increase of transformation of soil nitrogen guarantee the need of nutrient for corn in the late growth stage.According to results of nitrification inhibition, HI, nitrogen accumulation, NHI, yield, component factors of yield and NUE, we holding that formulation 2 with middle concentration(pyrazole-pyridine hydrochloride mixture in 0.25% addition) had the best effect, next came formulation 1(pyrazole-pyridine sulfate mixture). The nitrification inhibition of formulation 1 with high concentration in seedling stage was highest, 64.93%; HI was the highest, reached 61.39%; Yield of formulation 2 with low concentration(pyrazole-pyridine hydrochloride mixture in 0.125% addition), formulation 1 with middle concentration(pyrazole-pyridine sulfate mixture in 0.25% addition) compared with AF treatment increased 10.69% and 5.89%, respectively; NUE of formulation 2 and formulation 1 with low concentration(pyrazole-pyridine sulfate mixture in 0.125% addition) were best, 58.16% and 47.14%, respectively.