Which old sheds are selected for fertilization

For the old greenhouse, the most prominent problem is soil salinization, and the most prominent cause of soil salinization is long-term, large-scale application of fertilizer. Older greenhouses have poor heat preservation, and in winter and early spring, they are prone to root injury. Therefore, the old greenhouse should focus on the selection of microbial fertilizer or humic acid, water-soluble fertilizer and other fertilizers, which not only ease soil salinization but also improve the ground temperature.

Choose biofertilizers. Bio-fertilizer can release the fixed nitrogen, phosphorus and potassium in the soil and promote soil fertility. The use of biological fertilizers in older greenhouses is even more pronounced. In order to ensure that vegetables absorb enough nutrients, it is recommended that vegetable farmers still use biofertilizers and compound fertilizers for rotation.

Choose humic acid fertilizers. Because of the high nutrient content of nitrogen, phosphorus and potassium in the old greenhouse soil, humic acid fertilizer can increase the utilization rate of phosphorus and potassium and some trace elements in the soil. Humic acid fertilizer has synergistic effect on phosphorus and potassium. On the basis of increasing the application of humic acid fertilizer, the amount of chemical fertilizer can be appropriately reduced, which can be reduced by about 1/3. The humic acid fertilizers commonly used in vegetable production include nitrohumic acid, ammonium humate, sodium humate, potassium humate, potassium nitro-humate, diammonium humate, humic acid phosphate, etc. Friends can choose to apply.

Choose a fully water soluble fertilizer. The amount of water-soluble fertilizer is small, only 10 to 15 kg can be used in a greenhouse of one mu of land, and the utilization rate is as high as 85% or more. It can supplement the nutrients needed for crops, and the application of winter and biological fertilizers is worth promoting. The method of composting.

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