How to fertilize alkaline soil

Tests have shown that direct application of inorganic salt fertilizers under alkaline soil conditions, such as ferrous sulfate, manganese sulfate and zinc sulfate, can hardly achieve the desired effect. At the same time, under alkaline soil conditions, crops are prone to various physiological diseases, namely trace element deficiency. So how to improve the fertilization effect of alkaline soil and avoid the occurrence of trace element deficiency in crops?

The application of organic fertilizers in multiple ways can increase the application of organic fertilizers through straw returning, or intercropping of green manure, or fruit (vegetable) gardening. It is also possible to directly apply a fully decomposed farmyard manure based on human and animal manure.

Scientific and rational fertilizer selection in fertilizer selection, should fully consider the soil alkaline characteristics, on the one hand, pay attention to the priority use of diammonium phosphate or superphosphate. Because the application of calcium magnesium phosphate or phosphate rock in alkaline soil is basically ineffective, and the effect of diammonium phosphate and superphosphate is very good, the diammonium phosphate is granular, which is beneficial to increase the effective phosphorus content of soil; the soil with higher phosphorus content is best. The application of superphosphate, which contains certain sulfuric acid, facilitates the activation of the active constituents of the soil. On the Other hand, it is necessary to use physiological acid nitrogen and potassium fertilizers such as ammonium sulfate, ammonium chloride and potassium chloride. It is also possible to appropriately apply gypsum, phosphogypsum, ferrous sulfate, sulfur powder, acid weathered coal, etc., but do not apply alkaline fertilizers such as ammonia water, ammonium hydrogencarbonate, grass ash, etc., and it is particularly contraindicated to apply strong alkaline fertilizer lime.

Timely supplementation of trace elements alkaline soil is prone to zinc, boron, manganese, copper, iron and other trace element deficiency, which is a major obstacle to high yield of alkaline soil crops. When the base is applied, the micro-fertilizer can be rotted together with the organic fertilizer for a certain period of time to increase the effectiveness of the micro-fertilizer. In the case of deficiency of micro-fertilizer growth season, the corresponding organic chelated fertilizer should be used for foliar application in time to reduce the damage of physiological diseases.

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