There are many kinds of nitrogen fertilizers. Generally, nitrogen fertilizers can be divided into three types: ammonium nitrogen fertilizers, nitrate nitrogen fertilizers, and amide nitrogen fertilizers. 1. Nitrogen in ammonium nitrogen fertilizers is present in the form of ammonium (or ammonia), ie, ammonium nitrogen fertilizers such as ammonium bicarbonate, ammonium sulfate, and liquid ammonia. They have the following commonalities: 1, soluble in water: ammonium nitrogen fertilizer are easily soluble in water, and can produce ammonium ions and the corresponding anion, the crop can be directly absorbed and used, is a fast-acting nutrients, therefore, as top-dressing fertilizer effect faster. 2. Can be adsorbed by soil particles: ammonium ions in ammonium nitrogen fertilizer can exchange with existing cations on the soil colloid and can be adsorbed on the soil colloid and become exchangeable nutrients. After the ammonium ions are adsorbed, their mobility is small, they are not easily lost, and they can be gradually supplied to crops for absorption and utilization. Therefore, it is longer than the ammonium nitrogen fertilizer. It can be used as a basal fertilizer or top dressing. 4, can be transformed in the soil: in well-ventilated soil, ammonium nitrogen fertilizer can be nitrification, change to nitrate nitrogen, increase the mobility of nitrogen in the soil, easy to absorb crops, but also easy to cause the loss of nitrogen. II. Nitrogen in nitrate nitrogen fertilizers is nitrate-nitrogen in the form of nitrate ions. Such as ammonium nitrate, calcium nitrate, sodium nitrate and so on. Its characteristics are as follows: 1, soluble in water: soluble in water to produce nitrate ions, is a fast-acting nitrogen fertilizer. All kinds of nitrate nitrogen fertilizers have large solubility and strong hygroscopicity. They can be converted into liquids after being diluted in the rainy season, which causes inconvenience for application. 2. Cannot be adsorbed by soil: Nitrate-N fertilizer is applied to soil and cannot be adsorbed by soil colloid. It is easy to move with water and cause nitrate leaching and reduce fertilizer efficiency. Therefore, the nitrate nitrogen fertilizer can only exist in the soil solution after it is applied to the soil and moves with the soil moisture. Water Purifier,Water Purifier System,Household Water Purifier,Commercial Water Purifiers Jinan Mucho Commercial Inc. , https://www.muchovet.com
3, easy to decompose under alkaline conditions: ammonium nitrogen fertilizer will be decomposed in the case of alkaline substances, ammonia gas released after decomposition and volatile loss. Therefore, precautions should be taken to prevent ammonia from volatilizing during the storage, transportation, and application of ammonium nitrogen fertilizers.
3, easy to carry out anti-digestion and loss: in the case of poor soil ventilation, nitrate-N applied to the soil can be carried out by the anti-digestion effect, the formation of nitrogen oxide gas or nitrogen can not use the crop and nitrogen loss.
4. Inflammable and Explosive: Most of the nitrate nitrogen fertilizers have strong hygroscopicity, and the agglomerates after dehydration dehydration are prone to release ammonia gas by heat, which is flammable and explosive. In storage, transportation and application, attention should be paid to moisture and safety, and not to be flammable. Store together.
Nitrate nitrogen fertilizer is suitable for a variety of soil crops, especially suitable for dry farming areas, especially for cotton, tobacco, fruits, vegetables and other economic crops. However, the effect of nitrate nitrogen in paddy field is not as good as that of ammonium nitrogen. The main reason is that nitrate nitrogen has large mobility, nitrogen easily enters the reduced layer of paddy field with water, and renitrification is carried out in the reducing layer to put the nitrate Nitrogen is reduced to nitrogen or nitrogen oxides to escape the water surface and lose volatilization. Nitrate nitrogen fertilizer should be used as top dressing, generally not suitable for base fertilizer and seed fertilizer, because of its strong moisture absorption, will affect the seed germination and seedling growth, it can not be mixed with alkaline fertilizer application to prevent the volatilization of ammonia.
3. The nitrogen in the amide nitrogen fertilizer is present in the form of an amide, or the nitrogen fertilizer that produces the amide in the decomposition is called an amide nitrogen fertilizer. Such as urea, lime nitrogen and so on. The amide nitrogen they contain is generally subjected to the action of soil microorganisms and converted to ammonium nitrogen for absorption by the crop.