Application of organic fertilizer to know nitrogen content

Applying organic fertilizer can increase the organic matter content of cultivated land, which has many benefits. The author hereby reminds farmers that the use of commodity organic fertilizers requires the identification of nutrient content, especially nitrogen content. In general farmyard manure, except for individual cake manure and human fecal urine, the total nutrient content of nitrogen, phosphorus and potassium is generally not more than 6%, and the total nitrogen content is generally not more than 3%. Under normal circumstances, most composts contain less than 1% of total nitrogen, and the total nitrogen content of pig manure is not more than 1.5%. Nitrogen in these manures is mostly organic and can only be released in the soil by decomposition and transformation. Absorbed by crops. According to the calculation of 1% nitrogen in organic fertilizers, applying 6-8 tons of farmyard fertilizer per acre, and appropriately reducing the application of chemical fertilizers, will not cause problems.

The application of organic fertilizer with chemical fertilizer has a multiplication effect. Therefore, some commercial organic fertilizers include some nitrogen fertilizers, such as urea, ammonium sulfate or ammonium chloride, and the total nitrogen content is 6% to 10%, even higher, but some companies do not Clearly labeled in the package. If these commodity organic fertilizers are still applied at the application rate of about 1% of the general nitrogen fertilizer, it will inevitably cause crops to burn roots and burn seedlings. Therefore, some experts suggested that the application of organic fertilizer must be aware of nitrogen content, should be based on a small number of repeated fertilization principles apply higher nitrogen fertilizer.

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