Different crops have different nitrogen absorption

The nitrogen that plants can absorb in large amounts is ammonium nitrogen and nitrate nitrogen, and can also absorb small amounts of organic nitrogen, such as urea and simpler amino acids. Their quality is related to the application conditions and crop types. The response of different forms of nitrogen applied to different crops is often different.

The application of ammonium nitrogen to rice is better than that of nitrate nitrogen. Because of the lack of nitrate reductase in the roots of rice seedlings, nitrate nitrogen is not well utilized. In addition to the rice itself, the application of nitrate nitrogen in paddy fields tends to be lost, and denitrification under flooding conditions is also the cause of nitrogen loss. Therefore, in the application of nitrate nitrogen fertilizer in rice fields, there is information that its fertilizer effect is only 60% to 70% of ammonium nitrogen fertilizer.

The opposite is tobacco and vegetables, which are nitric nitrogen crops. Nitrate-nitrogen fertilizers are highly soluble and have high mobility in soils. They can quickly provide crop nitrogen nutrition. At the same time, nitrate-nitrogen fertilizers are easily lost and their fertilizer efficiency is short. This characteristic is in line with the requirements of tobacco. The leaves need to grow fast and can be "matured" by falling yellow when appropriate. Moreover, the nitrate nitrogen is beneficial to the formation of organic acids such as citric acid and malic acid in the tobacco body, and the baked tobacco leaves are of good quality and good combustibility. The application of nitrate-nitrogen in vegetable production is high, if the nitrate nitrogen is less than 50% of the total nitrogen of the fertilizer, the yield is significantly reduced. Therefore, in the production of tobacco and vegetable fertilizers, a certain percentage of nitrate nitrogen is required in nitrogen fertilizers. However, due to suitable soil moisture, temperature and aeration conditions, ammonium nitrogen can be oxidized to nitrate-nitrogen by nitrification. Therefore, tobacco and vegetables cannot absolutely be used as fertilizers containing ammonium nitrogen.

In addition, the application of physiological acid fertilizers such as ammonium sulfate does not grow well, and is often not due to ammonium nitrogen, but due to physiological acidity. Urea is a commonly used nitrogen source for the production of dry powdered granular compound fertilizers. After being applied to the soil, urea is generally hydrolyzed and converted into ammonium nitrogen fertilizer, which can be absorbed and utilized by plants.

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