Nitrogen content should be known in the application of commercial organic fertilizer

The application of organic fertilizer can increase the content of organic matter in cultivated land, which has a lot of benefits. The author would like to remind farmers that it is necessary to identify the content of nutrients, especially nitrogen, when applying commercial organic fertilizer.

For general farm manure, except for individual cake fertilizer and human feces and urine, the total nutrient content of nitrogen, phosphorus and potassium is generally no more than 6%, and the total nitrogen content is generally no more than 3%. Under normal circumstances, the total nitrogen content of most compost is less than 1%, the total nitrogen content of pig, cattle and sheep manure is less than 1.5%, and most of the nitrogen in these farm manure is organic and can be released in the soil before it can be absorbed by crops. According to the calculation of 1% nitrogen content of ordinary organic fertilizer, it will not be a problem to apply 680 tons of farm manure per mu and appropriately reduce the application of chemical fertilizer.

Organic fertilizer combined with chemical fertilizer has a doubling effect, so some commercial organic fertilizers have added some nitrogen fertilizers, such as urea, ammonium sulfate or ammonium chloride, and the total nitrogen content is 6% to 10%, or even higher, but some enterprises are not clearly marked in the packaging bags. If these commercial organic fertilizers are still applied according to the general application rate of farm manure containing about 1% nitrogen, it will inevitably cause crops to burn roots and seedlings. Therefore, some experts suggest that the nitrogen content must be known in the application of commercial organic fertilizer, and the fertilizer with higher nitrogen content should be applied in accordance with the principle of fertilization for a small number of times.