What is the appropriate concentration of agricultural ammonia water?

Colored clear liquid. An aqueous solution of ammonia. The higher the ammonia content, the lower the density. Easy to evaporate and release ammonia gas, with a strong infectious odor. Can be miscible with ethanol. Strong alkalinity. Can absorb carbon dioxide from the air. Heat is released when reacting with sulfuric acid or other strong acids. Placing volatile acids in close proximity can create smoke. The density is about 0.88g/ml (20 ℃). Corrosive. Tearful nature.
Ammonia water is an uninterrupted and non explosive liquid. Under normal conditions, dividing ammonia water into other ammonia compounds has a strong odor, is toxic, and poses a risk of stopping and exploding. Ammonia has a significant and drastic impact. The relative density is less than 1, and the higher the concentration, the smaller the relative density. Can react with acidic substances and metals such as copper and zinc.
The skin that comes into contact with ammonia water can become red, swollen, and hot. In severe cases, it can cause redness, blisters, ulceration, and necrosis. At this time, contaminated clothing can be quickly removed and rinsed with water or 2% vinegar. If there are blisters or exudation, wet compress with 2% boric acid solution.
The ammonia concentration of agricultural ammonia water is generally controlled within the range of 15% to 18% nitrogen content, and the carbonization degree of ammonia water should be greater than 100%. Fertilization is simple and there are many methods, such as ditch application, surface application, application with irrigation water or spray application. When using, it should be diluted with water to less than one thousandth, and avoid contact with stems and leaves to prevent burns.
The principle of using ammonia water is "not leaving the soil, not leaving the water". Not leaving the soil means deeply covering it with soil; Not leaving water means diluting with water to reduce concentration, decrease volatilization, or applying it in combination with irrigation. Because ammonia water has a lower density than water, attention should be paid to preventing excessive accumulation in some areas during irrigation, which may burn the plants. Ammonia water can be used as base fertilizer or topdressing.