Excessive application of chemical fertilizers and unreasonable irrigation are the main problems causing secondary salinization of vegetable soils. The secondary salinization of the vegetable soil in the facility is becoming more and more serious, and the soil of the open vegetable is also present, which has an adverse effect on the yield and quality of the vegetable. To this end, vegetable farmers can adopt the technical measures of “scientific fertilization, rational irrigation, biological demineralization, and straw returning to the field” to reduce secondary salinization of vegetable soil.

First, scientific fertilization

1. Add organic fertilizer and biological fertilizer

Combine deep tillage with high-quality organic fertilizers, such as green manure, compost compost, manure, and bio-fertilizer to improve soil structure, enhance soil fertility, promote lateral root extension of vegetable crops, increase roots' ability to absorb water and nutrients, and improve salt resistance. ability.

2. Adjust the proportion of organic fertilizer, chemical fertilizer and microbial fertilizer in vegetable fields

Organic fertilizers account for 65% of the crop growth period, chemical fertilizers account for 30% of the growth period, and microbial fertilizers account for 5% of the growth period. The organic fertilizer of livestock and poultry mainly based on chicken manure is changed into cake-fertilizer organic fertilizer, such as fermented tea seed cake and soybean meal. Chemical fertilizers should reduce chlorine and sodium-containing components according to the physiological needs of different crops. In addition, the correct choice of fertilizer type and fertilization method, as far as possible, the application of fertilizer without negative components. Formulated fertilization and on-demand supply can significantly reduce the residual accumulation of salt in the soil.

Second, reasonable irrigation

1. When the mulching film covers the mulch film, the method of watering under the membrane is advocated to reduce the evaporation rate of the soil surface and slow down the rate of rising salt in the deep soil.

2, extend the natural rainfall leaching time It is recommended to remove the film at the top of the greenhouse as early as possible from the end of June to the end of September, so that natural rainfall can fully leaching the soil and reduce the concentration of salt in the soil layer.

3, with water pressure salt recommended conditions during the park, deep soil after the field irrigation and maintained for more than 15 days to reduce the salt in the tillage layer.

Third, biological desalination

Planting sweet sorghum, sweet corn, Mexican corn, high dan grass, sudan grass and other desalinated organisms can absorb excess salt in the soil, which is one of the better methods to solve the secondary salinity of vegetable soil. It is recommended to plant sorghum, sweet corn, Mexican corn, high danshen, and sudan grass from late June to the end of September. According to the selected de-salting organisms and planting period, the seeding amount per mu is about 2 kg.

Fourth, straw returning

Straw returning is organic fertilizer, which can improve soil texture, enhance soil fertility and fertilization capacity, reduce fertilizer input, and slow down the secondary salinization of vegetable soil.

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