How to apply nitrogen fertilizer reasonably?
The purpose of rational application of nitrogen fertilizer is to reduce the loss of nitrogen, increase the utilization rate of nitrogen fertilizer, and give full play to the benefits of nitrogen fertilizer production.
To be reasonably applied, the distribution and application of nitrogen fertilizer must be considered in accordance with the following factors:
(1) Soil conditions Generally calcareous soil or alkaline soil can be applied with acidic or physiologically acidic nitrogen fertilizers, such as ammonium sulfate and ammonium chloride. In addition to their ability to neutralize soil alkalinity, these fertilizers are alkaline under alkaline conditions. Nitrogen is more easily absorbed by crops; in acidic soils, alkaline or physiological alkaline nitrogen fertilizers such as sodium nitrate, calcium nitrate, calcium ammonium nitrate or lime nitrogen can be used, which on the one hand can reduce soil acidity, on the other hand Crops readily absorb nitrate nitrogen under acidic conditions. It is not advisable to apply chlorine-containing ammonium chloride in saline-alkali soil to avoid increasing salt and affecting crop growth. In fertile soil, the amount of nitrogen applied is small, and the number of fertilization in soil with strong fertility can be less; on the contrary, the amount of nitrogen applied is appropriately increased and applied in divided doses.
(2) Crop nutrient characteristics The nitrogen requirements of various crops are different. For example, rice, corn, wheat and other crops need more nitrogen fertilizer, bananas, sugar cane, leafy vegetables and so on require more nitrogen fertilizer, while legume crops have Root nodules fix nitrogen in the air and therefore require less nitrogen. Different crops have different responses to nitrogen fertilizers. For example, ammonium fertilizer is applied to rice, especially ammonium chloride, ammonium bicarbonate and urea. Although ammonium sulfate is also ammonium nitrogen fertilizer, it often reduces hydrogen sulfide in paddy fields and hinders rice. Root breathing. Potato is also good for the application of ammonium nitrogen fertilizer, especially ammonium sulfate, which is beneficial to potato growth. Avoid chlorine crops such as tobacco, starch crops, grapes, etc. should be applied less or not. It is better to apply ammonium nitrate to the application of ammonium nitrate in tobacco, which can improve the quality of tobacco leaves. Most vegetables use nitrate nitrogen fertilizer for good effect. For example, the application of ammonium nitrogen fertilizer to radish will inhibit its growth. The use of sodium nitrate for sugar beet is good, and it is well known. The effects of applying nitrogen fertilizer at different growth stages of crops are also different. In the critical period of crop 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 and flowering, and the heavy application of panicle fertilizer can achieve significant increase in yield. Therefore, considering the nutrient requirements of crops at different growth stages, mastering the appropriate fertilization period and fertilization amount is the key to economically and effectively applying nitrogen fertilizer.
(3) The nature of nitrogen fertilizer itself. Any ammonium fertilizer, especially ammonium bicarbonate and ammonia water, should be deeply applied to prevent volatilization. Since they are all quick-acting fertilizers, they are not easy to be lost in the soil, so they can be used as base fertilizer and top dressing. And dryland application; nitrate nitrogen fertilizer has great mobility in the soil, fast fertilizer effect, suitable for dryland topdressing, and so on. In short, its application method should be considered according to the characteristics of nitrogen fertilizer.
(4) Nitrogen fertilizer combined with other fertilizers In the soil lacking effective phosphorus and available potassium, the effect of single application of nitrogen fertilizer is very poor, and the application of nitrogen fertilizer may reduce production. Because in the absence of phosphorus and potassium, proteins and many important nitrogen-containing compounds are difficult to form, seriously affecting the growth of crops. Experiments in various places have proved that nitrogen fertilizer combined with appropriate amount of phosphorus and potassium fertilizer has significant effect on increasing yield.
Reprinted: China Agriculture Network
The purpose of rational application of nitrogen fertilizer is to reduce the loss of nitrogen, increase the utilization rate of nitrogen fertilizer, and give full play to the benefits of nitrogen fertilizer production.
To be reasonably applied, the distribution and application of nitrogen fertilizer must be considered in accordance with the following factors:
(1) Soil conditions Generally calcareous soil or alkaline soil can be applied with acidic or physiologically acidic nitrogen fertilizers, such as ammonium sulfate and ammonium chloride. In addition to their ability to neutralize soil alkalinity, these fertilizers are alkaline under alkaline conditions. Nitrogen is more easily absorbed by crops; in acidic soils, alkaline or physiological alkaline nitrogen fertilizers such as sodium nitrate, calcium nitrate, calcium ammonium nitrate or lime nitrogen can be used, which on the one hand can reduce soil acidity, on the other hand Crops readily absorb nitrate nitrogen under acidic conditions. It is not advisable to apply chlorine-containing ammonium chloride in saline-alkali soil to avoid increasing salt and affecting crop growth. In fertile soil, the amount of nitrogen applied is small, and the number of fertilization in soil with strong fertility can be less; on the contrary, the amount of nitrogen applied is appropriately increased and applied in divided doses.
(2) Crop nutrient characteristics The nitrogen requirements of various crops are different. For example, rice, corn, wheat and other crops need more nitrogen fertilizer, bananas, sugar cane, leafy vegetables and so on require more nitrogen fertilizer, while legume crops have Root nodules fix nitrogen in the air and therefore require less nitrogen. Different crops have different responses to nitrogen fertilizers. For example, ammonium fertilizer is applied to rice, especially ammonium chloride, ammonium bicarbonate and urea. Although ammonium sulfate is also ammonium nitrogen fertilizer, it often reduces hydrogen sulfide in paddy fields and hinders rice. Root breathing. Potato is also good for the application of ammonium nitrogen fertilizer, especially ammonium sulfate, which is beneficial to potato growth. Avoid chlorine crops such as tobacco, starch crops, grapes, etc. should be applied less or not. It is better to apply ammonium nitrate to the application of ammonium nitrate in tobacco, which can improve the quality of tobacco leaves. Most vegetables use nitrate nitrogen fertilizer for good effect. For example, the application of ammonium nitrogen fertilizer to radish will inhibit its growth. The use of sodium nitrate for sugar beet is good, and it is well known. The effects of applying nitrogen fertilizer at different growth stages of crops are also different. In the critical period of crop 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 and flowering, and the heavy application of panicle fertilizer can achieve significant increase in yield. Therefore, considering the nutrient requirements of crops at different growth stages, mastering the appropriate fertilization period and fertilization amount is the key to economically and effectively applying nitrogen fertilizer.
(3) The nature of nitrogen fertilizer itself. Any ammonium fertilizer, especially ammonium bicarbonate and ammonia water, should be deeply applied to prevent volatilization. Since they are all quick-acting fertilizers, they are not easy to be lost in the soil, so they can be used as base fertilizer and top dressing. And dryland application; nitrate nitrogen fertilizer has great mobility in the soil, fast fertilizer effect, suitable for dryland topdressing, and so on. In short, its application method should be considered according to the characteristics of nitrogen fertilizer.
(4) Nitrogen fertilizer combined with other fertilizers In the soil lacking effective phosphorus and available potassium, the effect of single application of nitrogen fertilizer is very poor, and the application of nitrogen fertilizer may reduce production. Because in the absence of phosphorus and potassium, proteins and many important nitrogen-containing compounds are difficult to form, seriously affecting the growth of crops. Experiments in various places have proved that nitrogen fertilizer combined with appropriate amount of phosphorus and potassium fertilizer has significant effect on increasing yield.
Reprinted: China Agriculture Network
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