How to Fertilize Aged Greenhouses? A Detailed Guide to Practical Methods
In production, we often hear many vegetable growers complain that the fertilizer applied in their greenhouses has had no effect, and most conclude that it is a problem with the fertilizer itself. On closer consideration, this view is actually quite one-sided. Through visits, reporters found that low fertilizer use efficiency is the real crux of the problem. Fertilizer use efficiency refers to the nutrients absorbed by the crop in the current season...
For aged greenhouses, the most prominent problem they face is soil salinization, and the most prominent cause of soil salinization is vegetable growers' long-term, large-scale application of chemical fertilizers. Aged greenhouses have poor insulation, and after entering winter, root damage is also prone to occur. Therefore, when choosing water-flush fertilizers for aged greenhouses in winter, attention should be paid to choosing fertilizers such as microbial water-flush fertilizers or humic acid and fully water-soluble fertilizers, which both alleviate soil salinization and help raise ground temperature. Choose biological fertilizers. Biological fertilizers can release the nitrogen, phosphorus and potassium fixed in the soil, promoting the improvement of soil fertility. The effect of using biological fertilizers in aged greenhouses is more significant. To ensure that vegetables absorb sufficient nutrients, it is recommended that vegetable growers alternate the use of biological fertilizers and compound fertilizers.
Choose humic acid fertilizers. Because the soil in aged greenhouses has relatively high levels of nutrients such as nitrogen, phosphorus and potassium, humic acid fertilizers can improve the utilization rate of phosphorus, potassium and certain trace elements in the soil. Humic acid fertilizers have a synergistic effect on phosphorus and potassium. On the basis of increasing the application of humic acid fertilizers, the amount of chemical fertilizers can be appropriately reduced, generally by about 1/3. Commonly used humic acid fertilizers in vegetable production include nitrohumic acid, ammonium humate, sodium humate, potassium humate, potassium nitrohumate, humic diammonium, humic phosphate fertilizer, etc., which vegetable grower friends can choose to apply.
Choose fully water-soluble fertilizers. Fully water-soluble fertilizers are used in small amounts; only 10-15 jin is needed for one mu of greenhouse, while the utilization rate is as high as over 85%. They can supplement the nutrients needed by crops. Alternating application with biological bacterial fertilizer in winter is a water-flush fertilization method worth promoting.