There are many ways to increase nitrogen use efficiency

Nitrogen is an essential element for crop growth and plays an important role in promoting crop growth and increasing yield. Therefore, nitrogen fertilizer is a widely used fertilizer in production. However, many farmers now rely on nitrogen fertilizer excessively. Some plots use more nitrogen fertilizer than crops throughout the year. The 50% to 200% of the required amount of fertilizer not only wastes fertilizer, but also pollutes the groundwater source and destroys the granule structure of the soil, leading to a decline in cultivability, resulting in a large area of ​​disease, and how to reasonably use nitrogen fertilizer to increase its utilization and reduce The production cost becomes an important issue in fertilization, and the effective methods for increasing the nitrogen use efficiency are summarized as follows: 1. A small number of times and deep application of soil. In small amounts, more nitrogen nutrients can be absorbed by crops to reduce losses. Ditching and digging holes and applying them under the soil can significantly reduce the loss of nitrogen nutrients due to volatilization. Not only is the loss of floating surface application great, but also Plastic canopies can cause crop damage due to nitrogen accumulation. Second, see the weather conditions fertilization. The application of urea into the soil undergoes amination with the temperature rising. Therefore, when the temperature is high, urea should be applied. When the temperature is low, ammonia and ammonium bicarbonate should be applied, and nitrogen fertilizer should be sprayed on the leaves. The level of fertilizer effect is related to the length of time the fertilizer solution stays on the leaf surface. If the spray is applied when the light is sufficient and the temperature is high, the water evaporates quickly and the nitrogen is difficult to enter the leaf cells. If the rainfall is after spraying, the nitrogen fertilizer will be lost. This will lose the effect of foliar spray, so it is most appropriate. The time is cloudy and no rain or spray after 4pm. Third, fertilize according to soil conditions. The clay soil is heavy and the nitrogen leaching loss is less. The amount of nitrogen can be slightly larger on a single occasion. The sandy soil has a poor ability to retain water and fertility, and the amount of nitrogen applied is preferably based on the principle of eating less meals. Fourth, depending on the crop species fertilization. Nitrogen long-leaf phosphorus long fruit, potash fertilizer can grow Chai Qianlong, leafy vegetables such as cabbage, vegetables, leeks, leeks, etc., can be top-dressing nitrogen fertilizer, but fruit and vegetables, such as melons, solanaceous fruit, in addition to seedlings need to With more nitrogen, phosphorus, potassium, and other elements are needed in other periods. Excessive nitrogen fertilizer not only has a low utilization rate, but also causes the plants to grow in length. As a result, flowering delays and yield decreases. In addition, rhizobia such as soybeans, peanuts and other legumes can fix free nitrogen in the air, so nitrogen fertilizers can be used less or not. Fifth, fertilization at different growth stages. The germination period mainly uses the nutrients stored in the seeds, and it rarely absorbs the soil nutrients. The root system at the seedling stage is still underdeveloped. The absorption of soil nutrients is still not much. If excessive nitrogen fertilizer is applied, excess nitrogen fertilizer will accumulate in the soil. The vegetative growth period and the result period require a lot of nutrients. Need to fully provide fertilizer, but should pay attention to the rational mix of various fertilizers, can not be partial nitrogen fertilizer, production phased fertilizer, shade and mix, fertilization and irrigation combined with other measures to play a role in fertilizer, increase its utilization.

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