Understand the nitrogen content before applying commercial organic fertilizer

Applying organic fertilizer can raise the organic matter content of cultivated land and has many benefits. What I want to remind farmers here is that when applying commercial organic fertilizer, you must identify the nutrient content, especially the nitrogen content.

For ordinary farmyard manure, apart from a few oilseed cakes and human excreta, 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, the total nitrogen content of most compost is less than 1%, and the total nitrogen content of pig, cattle and sheep pen manure does not exceed 1.5%, and most of the nitrogen in these farmyard manures is in organic form, which must be decomposed and transformed in the soil before it can be released and absorbed by crops. Calculated on the basis of ordinary organic fertilizer containing 1% nitrogen, applying 6~8 tons of farmyard manure per mu while appropriately reducing the application of chemical fertilizer will not cause problems.

Combining organic fertilizer with chemical fertilizer has a multiplying effect, so some commercial organic fertilizers have part of the nitrogen fertilizer added, such as urea, ammonium sulfate or ammonium chloride, etc., with a total nitrogen content of 6%~10%, or even higher, but some companies do not clearly indicate this on the packaging bag. If these commercial organic fertilizers are still applied at the application rate for ordinary farmyard manure containing about 1% nitrogen, it will inevitably cause root burn and seedling burn of crops. Therefore, some experts suggest that when applying commercial organic fertilizer, you must know the nitrogen content, and fertilizers with higher nitrogen content should be applied according to the fertilization principle of small amounts applied multiple times.