First of all, when a large amount of organic fertilizer is added, green manure or pine needle soil is mixed. Organic fertilizer can effectively supplement the organic matter in the soil, and it is recommended that the vegetable farmers use it in large quantities. Mushi 25-30 square meters (more than one previous report, not repeat them here). Mixing green manure and pine needle soil is a quick and effective method for improving alkaline soil. Green manure and pine coniferous soil are made of weeds, decayed conifers, and residual litter, which are relatively acidic. Generally in the alkaline soil incorporation of 1/5-1/6 green manure or pine needle soil, you can improve the physical and chemical properties of the soil. Second, the use of phosphate fertilizer was switched to diammonium phosphate or superphosphate. The use of diammonium phosphate and superphosphate in alkaline soils works well. In the process of applying fertilizer, try to use physiological acidic fertilizers such as ammonium sulfate and potassium sulfate. These fertilizers can neutralize the soil. Again, apply an alkaline soil conditioner. Studies have shown that gypsum or phosphogypsum-based soil conditioners have significant effects on alkaline soils. This alkaline soil improver consists mainly of gypsum, urea, and the like. This method of combining chemical improvement with physical improvement using crop straw mixed gypsum can fundamentally improve soil compaction and has a significant effect. In addition, when applying the above three measures, it is necessary to pay attention to the depth of application. The basic fertilizer should be applied to the entire plough layer, ie 15-20 cm depth. For organic fertilizers, nitrogen fertilizers, potash fertilizers, and trace fertilizers, they can be mixed evenly on the surface of the ground and then ploughed into the soil so that the fertilizer can be uniformly mixed with the entire plough layer to facilitate the absorption and utilization of nutrients by different root layers of the crop. Phosphorus fertilizers are poor in mobility and lose their effectiveness when they are applied to the soil. Therefore, they should be applied in two layers: the lower layer should be applied to a depth of 15-20 cm, and the upper layer should be applied to a depth of about 5 cm. The upper layer mainly meets the demand for phosphorus at the seedling stage of crops, and the lower layer supplies the phosphorus nutrition during the middle and later stages of crop growth.
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