The method of applying fertilizer by water is also called “fertilizingâ€, which is a kind of top dressing method to provide supplementary nutrition during the fast growing period of crops. Since it is a supplementary fertilizer, it cannot substitute for the main fertilizers such as basal fertilizer. However, because this method is convenient and fast, it is widely used in irrigated fields of vegetable fields and cash crops and special food crops.
At present, the fertilization is mainly used in the vigorous season of growing vegetable crops, and is widely used in greenhouse cultivation and open field vegetables. Due to the rapid fertility of fertilization, it is generally effective from 2-3 days to 3-5 days after rinsing. It is reflected in the changes in leaf color and plant height, which is in line with the enthusiasm of some growers. Therefore, fertilization has been used for many years. It has been widely adopted. Considering comprehensively the agricultural production target of high yield, high quality, high efficiency and taking into account of environmental protection, and the current situation of the lack of rural labor force, in order to exert the strengths of fertigation to avoid its shortcomings, the technical essentials of flushing and fertilization are briefly described as follows:
Choose fertilizer type
Only water-soluble fertilizers can be applied with water. Urea, ammonia, ammonium sulfate and ammonium nitrate are commonly used in nitrogenous fertilizers; potassium and potassium sulfates are used in potassium fertilizers, and potassium nitrate can also be used. Even phosphorus-containing ammonium phosphate and diammonium phosphate do not need to be flushed. Because the phosphate fertilizer has poor mobility after being dissolved, it is easily fixed and cannot infiltrate into the root layer with water. Phosphate fertilizer can only be applied in the best way to layer it into the soil in order to improve its utilization.
Quasi-fertilization
The fertilization application is better during the growing period of crops. For example, in fruit and vegetables, it can be flushed after harvesting fruits and fruits. Another example is Chinese cabbage, which should be used during the fall season when the temperature drops. Other vegetable crops should also be applied during the growing season.
Control the amount of irrigation
Flood irrigation to prevent flooding. When canal irrigation, the depth of the ditch is suitable for the amount of water to prevent nutrients dissolved in the water from being lost. Many farmers like to use this top-dressing method and it is effective to use it. However, in order to pursue the effect of the surface, regardless of the cost, one-sided use of large amounts of nitrogen fertilizer, misuse of fertilization, will lead to vegetables, longevity, quality, fertilizer use efficiency, loss of nitrogen, increase soil salinization.
Some people break down granular high-concentration compound fertilizers and crush them; others use unprocessed and insoluble solid organic fertilizers or microbial preparations as fertilizers. These are not appropriate.
In short, the following points must be mastered in principle: The mode of fertilization should be applied in a timely and appropriate manner, mainly for top dressing in intensive vegetable cultivation, and topdressing nitrogen and potassium. Second, there are four types of fertilizers that should not be used for flushing: one that does not flush phosphorus; two that do not flush granular composite fertilizers; three that do not flush solid organic fertilizers; and that do not crush microbial preparations or fertilizers.
Elisa Microplate Reader,Laptop Diagnostic Machine,Elisa Microplate Reade,Elisa Immunoassay Machine
Guangdong Widinlsa International Co.Ltd , https://www.widinlsa.com