Detailed Explanation of Key Technical Points for Rational Nitrogen Fertilizer Application

Although all kinds of nitrogen fertilizers now have their own characteristics, and manufacturers all claim their products are excellent, to apply nitrogen fertilizer scientifically and rationally, factors such as soil conditions, nitrogen fertilizer application techniques, and the needs of crop varieties must also be considered.

Selecting Nitrogen Fertilizer Types According to Soil Conditions

In alkaline soil, acidic or physiologically acidic fertilizers should be chosen; in acidic soil, alkaline or physiologically alkaline fertilizers are suitable. In saline-alkali soil, avoid fertilizers that increase soil salinity. In low-lying waterlogged soil, sulfur-containing fertilizers such as ammonium sulfate should not be applied, to prevent the formation of hydrogen sulfide. In paddy fields, nitrate nitrogen fertilizers should not be applied, to prevent leaching and denitrification.

Selecting Nitrogen Fertilizer According to Crop Nutritional Characteristics

Leafy vegetable crops (green leafy vegetables, mulberry, tea, gramineous crops) require more nitrogen. Leguminous crops have rhizobia and only need a small amount of nitrogen fertilizer applied in the early growth stage. Root and tuber crops (sweet potato, potato, sugar beet, sugarcane) need nitrogen in the early stage to enhance photosynthesis; excessive nitrogen in the later stage will affect starch accumulation.

Balanced Fertilization Based on Soil Testing and Formula Fertilization

By mastering soil testing data, calculate the reasonable fertilizer application rate. And achieve balanced fertilization according to crop needs.

Advocate Deep Application

Prevent ammonia volatilization, block nitrification-denitrification, and enhance the crop root system's utilization of nitrogen.

Choose New Types of Nitrogen Fertilizer

Using urease inhibitors can alleviate urea hydrolysis and reduce losses from ammonia volatilization. Using nitrification agents (nitrogen fertilizer synergists) can, to a certain extent, inhibit the nitrification rate, slow the conversion of ammonium nitrogen to nitrate nitrogen, reduce nitrogen losses from denitrification and phosphate leaching, and at the same time reduce nitrate accumulation in fruit and vegetable crops. The principle of slow-release nitrogen fertilizer lies in the slow dissolution rate of the fertilizer, which will not trigger strong ammonia volatilization and loss, ensuring that the nitrogen element is fully utilized.

At present, manufacturers place too much emphasis on the effect of the fertilizer product itself, but in reality, nitrogen fertilizer use efficiency is affected by many customer factors such as soil conditions, climate environment, farming patterns, and crop varieties. Even new types of nitrogen fertilizer, although in theory they have a very good effect on improving nitrogen use efficiency, cannot be guaranteed to play a 100% role in the actual agricultural production environment. Therefore, scientific balanced fertilization is the truly comprehensive way to improve the effect of nitrogen fertilizer application.