Loss of soil fertility due to the depletion of plant nutrients not only poses a threat to food security, but also leads to serious environmental deterioration. Nitrogen recycling in agricultural ecosystems does not negatively affect ecosystems. However, the disappearance of nitrogen from agricultural ecosystems does not cause problems for the ecosystem. It also indicates the loss of soil fertility and its impact on the environment. The resulting adverse effects include the greenhouse effect, the reduction of atmospheric stratospheric ozone, acid rain, changes in the global nitrogen cycle, and the nitration of groundwater. The nitrogen meter can effectively determine the nitrogen content of crops.
The main reason for the low utilization rate of nitrogen is its disappearance from the plant-soil system due to leaching, surface runoff, corrosion, and gas evolution. The thin one of these causes has its relative importance at different sites. Loss of leaching will be a major factor in a climate in which rainfall exceeds the transpiration of water or in the environment. The evolution of nitrogen by gas includes volatilization and denitrification, allowing nitrogen to enter the atmosphere as NH3, NO, N, O, and Nz. It is estimated that the total amount of N, O, and NO released from farmland in the global onion year is 3.5 million tons and 2 million tons, respectively, because the amount of chemical fertilizer-induced N70 and NO is about 1.25 million tons per year, and N is induced by animal fertilizers. The amount of knives and NO is about 320,000 tons per year
There is a close relationship between the denitrification and the production of N20 and the amount of nitrogen that has not yet been utilized by the crop compared to the total amount of applied nitrogen. Therefore, the use of nitrogen fertilizer plays a key role in the loss of nitrogen. Tropical regions provide favorable conditions for the loss of large amounts of N, O, and NO, but the size of runoff losses is mainly determined by the management factors of soil-crop. Adjusting the application amount of nitrogen fertilizer according to the needs of crops and adopting proper fertilization methods can reduce the loss of NO.
The measurement results of the crop nitrogen measurement instrument found that, from the perspective of nutrition management, the crop growth pattern, growth stage, and required measures (relationships between various measures and crop density, moisture, and insect pests) are generally ) is understood. In addition, there are some sudden methods, related diagnoses, and on-site nutrition management measures. The Food and Agriculture Organization of the United Nations has advocated a method called the Integrated Plant Nutrition System (1PNS), which can appropriately combine inorganic fertilizers with organic fertilizers and biological resources according to the requirements of the target production.
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