A fertilization method for reducing sewage discharge from dry land planting by using mixed application of organic fertilizer and chemical fertilizer

Abstract

The invention belongs to the field of agricultural pollution control and discloses a high-benefit and low-pollution fertilizer applying method for reducing dry land planting pollution discharge by using mixed application of organic fertilizer and chemical fertilizer and an application of the method. The method comprises the following concrete steps: determining an optimum fertilizer applying amount; and applying base fertilizer and additional fertilizer alternately, wherein in the applied base fertilizer, the applied nitrogen is 100% of the total amount of nitrogen, the applied phosphorus is 85%-95% of the total amount of phosphorus, the applied potassium is 90%-95% of the total amount of potassium, the nitrogen is completely provided by the organic fertilizer, phosphorus and potassium which are insufficiently provided by the organic fertilizer are supplemented by phosphate fertilizer and potassium fertilizer, and the base fertilizer is applied in a manner of deep placement coverage; in the applied additional fertilizer, the rest of phosphate fertilizer and potassium fertilizer as the additional fertilizer are applied once in a manner of foliage spray. The method is capable of reducing the runoff loss of nitrogen by 60%-80%, the loss of phosphorus by 65%-85% and the loss of potassium by 35%-55% on the premise of not influencing the crop yield.

Description

technical field [0001] The invention belongs to the field of agricultural pollution control, and particularly relates to a high-efficiency, low-pollution fertilization method for reducing dryland planting sewage discharge by mixed application of organic fertilizer and chemical fertilizer and its application. Background technique [0002] As an important modern chemical input element, chemical fertilizer has played a great role in my country's agricultural production. At present, China has become the world's largest producer of chemical fertilizers, but also the world's largest consumer of chemical fertilizers. In the past 20 years, the amount of chemical fertilizers used in the country has increased from 25.9 million tons in 1990 to 51.08 million tons in 2007, accounting for 1 / 3 of the world's average consumption, and the amount is close to 400kg / hm 2 . However, the part of farmland nutrients used by plants in our country is very little every year. The utilization rate of ...

AI Technical Summary

Problems solved by technology

3. Because we only pay attention to the application of quick-acting nitrogen fertilizers, the supply of nutrients is unbalanced, affecting the normal absorption and utilization of crops, resulting in excess soil salt and accumulation

[0003] On the one hand, the pollution of the environment caused by the extensive use of chemical fertilizers