Saline-alkali soil fertility

In the saline-alkali soil, the application of organic fertilizer should be mainly applied to fertilization, and the application amount of chemical fertilizer should be properly controlled. The volatilization loss of nitrogen in saline-alkali soil is larger than that in neutral soil, and the effect of deep fertilization is significantly higher than that of superficial fertilization. Therefore, it is necessary to improve the fertilization method of saline-alkali soil, and use the larger-sized fertilizer to reduce the surface area in contact with the soil: 80% of the table is applied as the base fertilizer or full-layer fertilization, and 20% is used as the panicle fertilizer.
A large amount of organic matter in organic fertilizer can increase the buffering capacity of the soil to harmful anions and cations, and the organic fertilizer has a long-lasting and non-loss effect, which is beneficial to the growth of seedlings and roots.
The amount of chemical fertilizer applied in saline-alkali soil should not be too much. Alkaline rice fields can be applied with acidic fertilizers, such as super-calcium phosphate and ammonium sulfate. Neutral fertilizers can be applied to rice fields with high salt content to avoid aggravating the soil salinization. Fertilizer application in saline-alkali soil should be applied in divided doses and eat less meals.
Add phosphate fertilizer and appropriate zinc supplementation. Phosphorus is closely related to the acidity and alkalinity of the soil. The available phosphorus is more in the range of pH 6~7.5; when the pH is greater than 7.5 or less than 5.5, the available phosphorus is significantly reduced. In the saline-alkali soil, 30 to 50 days of flooding, the soil pH decreased from 8 to 7.1 to 7.3, so the available phosphorus increased, but it was still lower than that of the non-saline soil after flooding. Therefore, the salt should increase phosphorus. Dosage. Zinc deficiency in saline-alkaline rice areas is more common, and it is easy to produce rice shrinkage seedlings. Zinc supplementation can be applied by base fertilizer application or rooting method during transplanting.

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