Effects of Variable Topdressing on Soil Chemical Properties and Maize Yield
In order to promote green and precise fertilization of maize in the Northeast Black Soil Area,field experiments were carried out with variable nitrogen topping fertilization.The experiment was based on high spatial resolution remote sensing image data,using the local conventional nitrogen topping amount of 225 kg·ha-1 as the standard,5 fertilization layers were set up and prescription maps were generated.To study the effect of precise and variable nitrogen topping fertilization technology on soil chemical properties and maize yield indicators.The results showed that the content of soil organic matter and alkali-hydrolyzable nitrogen in the 855 Farm test base showed that the treatment with slightly reduce the application of nitrogen fertilizer was significantly higher than other treatments,and the treatment with the conventional nitrogen application rate increased by 17.0％and 44.1％respectively.The content of organic matter increased by 8.2％-70.3％compared with that before nitrogen application.Nitrogen fertilizer application after the variable,the pH of slightly reduce the application of nitrogen fertilizer treatment and a small amount of increased nitrogen fertilizer application treatment was significantly higher than that of the conventional nitrogen application rate treatment by 4.8％-5.7％,and the treatment of a large amount of increased nitrogen fertilizer application treatment was 1.7％higher than that of the conventional nitrogen application rate treatment.Although the yield of each nitrogen fertilizer application after the variable treatments was lower than that of the conventional nitrogen application rate treatment,the difference is not significant.The soil organic matter content in the 856 Farm test base increased(3.0％-36.4％)after variable nitrogen fertilizer application,and the difference between the treatments was not significant.Nitrogen fertilizer application after the variable,the alkali-hydrolyzed nitrogen content of the conventional nitrogen application rate treatment was the highest(46.08 mg·kg-1),which was significantly different from that of a large amount of increased nitrogen fertilizer application treatment.The pH of the nitrogen fertilizer application after the variable except a small amount of increased nitrogen fertilizer application treatment was lower than that of the conventional nitrogen application rate treatment,and the other conventional nitrogen application rate treatments were higher than the conventional nitrogen application rate treatment by 4.2％-5.5％,and the difference between the treatments was not significant.The yield of nitrogen fertilizer reduction treatments was higher,and the yield of nitrogen fertilizer increase treatments was lower,and the difference between each treatments was not significant.To sum up,although nitrogen fertilizer application after the variable for one year did not show obvious effect on reducing the spatial difference of soil available nutrients,it increased the content of organic matter,promoted the plot to maintain uniform and stable yield,and achieved the effect of stable yield and increased yield.
maizeprecision fertilizationvariable topdressing nitrogen fertilizerincrease production and efficiencybalancing soil fertilityincrease yield
万方数据
维普
