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Nitrogen fertilizer is used
Nitrogen is one of the three major nutrients necessary for crop growth. It can form proteins and form plant bodies. The purpose of reasonable application of nitrogen fertilizer is to reduce the loss of nitrogen, increase the utilization rate of nitrogen fertilizer, and give full play to the benefit of nitrogen fertilizer production. The following are the advantages: 1. Application according to soil properties. Alkaline soils can be applied with acidic or physiologically acidic nitrogen fertilizers such as ammonium sulfate, ammonium chloride, etc. They can not only neutralize the alkalinity of the soil but also form ammonium nitrogen that is easily absorbed by crops; , Optional application of alkaline or physiological basic nitrogen fertilizer, such as urea, sodium nitrate, calcium nitrate, calcium ammonium nitrate or lime nitrogen, etc., on the one hand, it can reduce the acidity of the soil, on the other hand, it is easily formed by the crop under acidic conditions. Absorbed nitrate nitrogen. In the saline-alkaline soil, chlorine-containing ammonium chloride should not be used to avoid increasing salt and affecting crop growth. In fertile soils, the amount of nitrogen applied should be less, and the frequency of fertilization in soils with strong fertility guarantees can be less; on the contrary, the amount of nitrogen applied should be increased appropriately, and it should be applied in divided doses. Second, according to the type of crop and growth conditions for application. The requirements for nitrogen are not the same for various crops. For example, crops such as sugar cane and leafy vegetables require more nitrogen, crops such as rice, corn, and wheat require medium nitrogen, whereas leguminous crops have fixed nitrogen in the air. Therefore, less nitrogen is needed. Different crops respond differently to nitrogen fertilizers. For example, ammonium fertilizers are applied to rice, especially ammonium chloride, ammonium bicarbonate, and urea. The application of ammonium sulfate to potatoes is effective. Chlorine-free crops such as tobacco, starchy crops, grapes, etc. should be applied with little or no ammonium chloride. Most vegetables have good nitrate nitrogen fertilizer application. The effects of applying nitrogenous fertilizer to crops at different growth stages are also different. In the crucial period when the crop needs fertilization, such as the critical period of nutrition or the maximum efficiency period, the effect of increasing yield is significant. For example, corn needs the most nutrients before and after heading flowering, and heavy panicle fertilizer can obtain significant yield increase. Therefore, according to the requirements of crops on nutrients, grasping the appropriate fertilization period and quantity is the key to the economic and effective application of nitrogen fertilizer. Third, according to the nature of nitrogen fertilizer application. Ammonium bicarbonate and ammonia water should be covered with soil to prevent evaporation. Because they are all fast-acting fertilizers, they are not easy to lose in the soil, so they can be used as base fertilizers and topdressing fertilizers. They are suitable for paddy fields and dry lands. Nitrate nitrogen fertilizers have large mobility and good fertilizer efficiency, and are suitable for top-dressing in drylands. In short, according to the characteristics of nitrogen fertilizer to consider its application method. Fourth, with a suitable amount of phosphorus and potassium fertilizer application. In soils lacking available phosphorus and available potassium, the effect of single application of nitrogen fertilizer is very poor, and increasing nitrogen fertilizer may also reduce production. Because in the absence of phosphorus and potassium, proteins and many important nitrogen compounds are difficult to form and seriously affect crop growth. Local trials have demonstrated that the combined application of nitrogen fertilizer and appropriate amount of phosphorus and potassium fertilizers has a significant effect on yield increase.