Water-soluble fertilizers have obvious advantages in improving fertilizer utilization, saving agricultural water, reducing ecological environmental pollution, improving crop quality, and reducing labor force. However, the following fertilization techniques should be used in combination with their characteristics when applying:
Avoid direct flushing and take secondary dilutions. Water-soluble fertilizer has higher nutrient content and less amount of fertilizer than ordinary compound fertilizer. Direct flushing can easily cause burned seedlings to injure roots and seedlings and weak seedlings. Secondary dilution is not only beneficial to the uniform application of fertilizers, but also can improve fertilizer utilization.
Apply in small quantities. 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 fertilization principle, which is consistent with the characteristics of the plant roots to continuously absorb nutrients and reduce the leaching loss caused by one-time large-scale fertilization. The average dosage per acre is 3-6 kg.
Pay attention to nutrient balance. Water-soluble fertilizers are generally applied by pouring or spraying, or they are mixed into water and applied together with irrigation (drip irrigation, sprinkling 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.
With 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.
Use as much as possible or mix 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 fertilizers should be applied as much as possible or mixed with non-alkaline pesticides to prevent metal ions from reacting to produce precipitation, resulting in leaf fertilizer or injury.
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.
Prevent the accumulation of salt 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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