The purpose of reasonable application of nitrogen fertilizer is to reduce the loss of nitrogen, improve the nitrogen fertilizer utilization, and give full play to the benefits of nitrogen fertilizer production. To achieve reasonable application, the allocation and application of nitrogen fertilizer must be considered based on the following factors: (1) The soil conditions are generally calcareous or alkaline, and acidic or physiologically acidic nitrogen fertilizers such as ammonium sulfate and ammonium chloride can be applied. In addition to their ability to neutralise soil alkalinity, ammonium fertilizers are more readily absorbed by crops under alkaline conditions, whereas alkaline soils or physiologically basic nitrogen fertilizers such as sodium nitrate, calcium nitrate, and ammonium nitrate can be used in acidic soils. Calcium or lime nitrogen, etc., on the one hand, can reduce the acidity of the soil, and on the other hand, the crop easily absorbs nitrate nitrogen under acidic conditions. 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 frequency of nitrogen fertilization in soils with fewer nitrogen fertilizers and strong fertilizer retention capacity may be less. On the contrary, the nitrogen application rate shall be appropriately increased and applied in divided doses. (2) Nutritional characteristics of crops The nitrogen requirements of various crops are not the same, such as rice, corn, wheat, and other crops require more nitrogen fertilizer, bananas, sugar cane, leafy vegetables, etc. require more nitrogen, and legumes have Nodules fix nitrogen in the air and therefore require less nitrogen fertilizer. Different crops have different responses to nitrogen fertilizers. For example, ammonium is applied to rice, especially ammonium chloride, ammonium bicarbonate, and urea. While ammonium sulfate is also an ammonium nitrogen fertilizer, hydrogen sulfide is often reduced in paddy fields to hinder rice growth. Root breath. Potatoes are also good for applying ammonium nitrogen fertilizers, especially ammonium sulfate, because sulfur is beneficial to potato growth. Chlorine-free crops such as tobacco, starchy crops, grapes, etc. should be applied with little or no ammonium nitrate. It is better to apply Ammonium Nitrate in Tobacco to improve the quality of tobacco leaves. The application of nitrate nitrogen fertilizer is effective for most vegetables. For example, application of ammonium nitrogen fertilizer to radish will inhibit its growth. The use of sodium nitrate as a sugar beet is good, and it is already known. The effects of applying nitrogenous fertilizer to crops at different growth stages are also different. Fertilization in the critical period of crop fertilization, such as the critical period of nutrition or the maximum efficiency period, has a significant effect on yield increase. For example, corn needs the most nutrients before and after heading and flowering, and heavy panicle fertilizer can obtain significant yield increase. Therefore, taking into account the requirements for nutrients at different growth stages of crops, and grasping the appropriate fertilization period and fertilization amount, are the key to economically effective nitrogen fertilizer application. (3) The nature of nitrogen fertilizers Every ammonium fertilizer, especially ammonium bicarbonate and ammonia, must be covered with soil to prevent volatilization. Since they are all quick-acting fertilizers, they are not easily lost in the soil. Therefore, they can be used as base fertilizers and fertilizers, suitable for paddy fields. , dry land application; nitrate nitrogen fertilizer in the soil mobility, fertilizer efficiency, suitable for dry fertilizer, and so on. In short, according to the characteristics of nitrogen fertilizer to consider its application method. (4) The combination of nitrogen fertilizer and other fertilizers 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, seriously affecting the growth of crops. Experiments have proven that nitrogen fertilizers with appropriate amount of phosphorus and potassium fertilizers have a significant effect on yield increase.
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