Water-soluble fertilizers have obvious advantages in improving fertilizer utilization, saving agricultural water, reducing ecological environmental pollution, improving crop quality, and reducing labor force. When applying water soluble fertilizers, note the following technical points:
1, avoid direct flushing. The water-solubilized fertilizer that requires double dilution has higher nutrient content than the compound fertilizer, and the amount is relatively small. The direct flushing can easily cause burned seedlings to injure roots, have small seedlings, and weak seedlings. The secondary dilution is not only conducive to uniform fertilizer application, but also Increase fertilizer utilization.
2, a small number of multiple applications. Due to the fast availability of water-soluble fertilizers, it is difficult to retain them in the soil for a long period of time. A small amount is the most important principle for fertilization, which is consistent with the characteristics of the plant roots to constantly absorb nutrients and reduce the leaching loss caused by one-time large-scale fertilization. Generally, the dosage per acre is 3-6 kg.
3, pay attention to nutrient balance. Water-soluble fertilizers are generally poured or sprayed, or mixed into water, and applied with irrigation (drip irrigation, sprinkler irrigation). It should be reminded that, when drip fertilization is used, the roots of crops grow densely and have large amounts, and the dependence on nutrient supply to the soil is reduced, relying more on the nutrients provided by drip irrigation. If the formula of water-soluble fertilizer is not balanced, it will affect crop growth. In addition, water-soluble fertilizers should not be applied with conventional irrigation methods such as flood irrigation or flowing water irrigation to avoid fertilizer waste and uneven application.
4, with the application. Water-soluble fertilizers are quick-acting fertilizers that can only be used as top-dressing fertilizers. Especially in conventional agricultural production, water-soluble fertilizers cannot replace other conventional fertilizers. It is necessary to combine basal fertilizer with top dressing, organic fertilizer with inorganic fertilizer, and water soluble fertilizer with conventional fertilizer in order to reduce costs and give full play to the advantages of various fertilizers.
5, as far as possible single or mixed with non-alkaline pesticides. When vegetables suffer from deficiency of nutrients or poor root growth, many farmers use more methods of spraying water-soluble fertilizers to ease them. In this reminder, water-soluble fertilizer should be applied as far as possible alone or mixed with non-alkaline pesticides, so as to avoid precipitation of metal ions, resulting in fertilizer damage or injury.
6, to avoid excessive irrigation. When irrigation is the main purpose of irrigation, it can reach the depth of root moisture. Different crop root depths are very different. You can use shovel to dig the soil at any time to know the depth of the root layer. Excessive irrigation not only wastes water, but also causes nutrients to be lost below the root layer. Crops cannot absorb and waste fertilizer. In particular, the urea and nitrate nitrogen fertilizers in water-soluble fertilizers (such as potassium nitrate, calcium ammonium nitrate, nitrophosphate fertilizers, and water-soluble fertilizers containing nitrate nitrogen) are easily lost to water.
7. Prevent salt accumulation on the surface. Greenhouses or greenhouses using drip irrigation for a long time will cause surface salt accumulation and affect root growth. Irrigation under the membrane can be used to inhibit salt migration to the surface.
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