How to apply fertilizer in the aged greenhouse
For the aged greenhouse, the most prominent problem is soil salinization, and the most prominent reason for soil salinization is long-term and large-scale application of chemical fertilizer by vegetable farmers. The aging greenhouse has poor thermal insulation, and after entering winter, it is easy to appear root injury phenomenon. Therefore, the aging greenhouse should pay attention to the selection of microbial irrigation fertilizer or humic acid, total water-soluble fertilizer and other fertilizers when selecting irrigation fertilizer in winter, which not only relieves soil salinization but also helps to improve ground temperature. Choose bio-fertilizer. Biological fertilizer can release nitrogen, phosphorus and potassium fixed in soil and promote soil fertility. The effect of using biological fertilizer in aged greenhouse is more remarkable. In order to ensure that vegetables absorb enough nutrients, it is recommended that vegetable farmers use biological fertilizer and compound fertilizer alternately. Select humic acid fertilizer. Humic acid fertilizer can improve the utilization rate of phosphorus, potassium and some trace elements in soil because of the high content of nitrogen, phosphorus and potassium in aged greenhouse 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 reduced appropriately, generally by about 1/3. Humic acid fertilizers commonly used in vegetable production include nitrohumic acid, ammonium humate, sodium humate, potassium humate, potassium nitrohumate, diammonium humate, humic phosphate, etc. Vegetable farmers can choose to apply. Choose fully water-soluble fertilizers. The amount of water-soluble fertilizer is small, only 10-15 jin can be used for one mu of greenhouse, and the utilization rate is as high as 85%, which can supplement the nutrients required by crops. In winter, it is applied alternately with biological fertilizer, which is worth popularizing.
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Attention should be paid to foliar fertilizer
People use fertilization to increase crop yield, improve product quality, increase economic benefits, maintain and improve soil fertility. Organic fertilizer is an indispensable fertilizer for the production of green food, first, it can improve soil fertility; second, it can reduce soil pollution; third, it has nutritional effect. Organic fertilizer needs to be harmless.
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Which fertilizers are not suitable for growing fertilizer?
Three kinds of chemical fertilizers should not be used as fertilizers containing harmful ions: ammonium chloride and potassium chloride fertilizers, which contain a large number of harmful chloride ions, which produce water-soluble compounds after being applied to the soil, which will burn seeds and seedlings; fertilizers such as ammonium nitrate and potassium nitrate contain nitrate ions. It has a serious impact on seed germination, so it is not suitable to be used as seed fertilizer. ...
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