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Due to the addition of some nitrogenous fertilizers, such as urea, ammonium sulfate, or ammonium chloride, commodity organic fertilizers have a total nitrogen content of 6% to 10% or even higher. If these commodity organic fertilizers are still applied at an application rate of about 1% of the general nitrogen fertilizer, it will inevitably cause burning of roots and burning of seedlings. Therefore, when applying commercial organic fertilizer, it is necessary to identify the nutrient content, especially nitrogen content, and must not blindly apply it. For organic fertilizers and commodity organic fertilizers containing more than 4% nitrogen, the application amount per mu shall not exceed 500 kg in principle. At the same time, the input of fertilizers such as compound fertilizers shall be properly adjusted. Commodity organic fertilizers containing more than 10% nitrogen, organic-inorganic compound fertilizers, compound fertilizers, large amounts of water-soluble fertilizers, and water-soluble fertilizers containing humic acid, etc., should be applied at a rate of 3 to 5 kg per acre of total nitrogen. The amount should be applied to fertilizers with higher nitrogen content based on a small number of fertilization principles.