There are many kinds of farmyard manure, and the source is large and the quantity is large. It is convenient to take materials locally, and it is used on the spot, and the cost is relatively low. The characteristics of farmyard manure are that the nutrients contained in it are relatively comprehensive. It contains not only nitrogen, phosphorus and potassium, but also trace elements such as calcium, magnesium, sulfur and iron. These nutrients are mostly in the state of organic matter, which are difficult to be directly absorbed and utilized by crops. They must undergo chemical and physical action in the soil and fermentation and decomposition of microorganisms to gradually release nutrients, so that the fertilizer effect is long and stable. In addition, the application of farmyard manure is beneficial to promote the formation of soil aggregate structure, coordinate the ratio of air and water in the soil, loosen the soil, and increase the ability of water retention, heat preservation, ventilation and fertilizer retention.
Although the farmer's fertilizer has the above advantages, there are still some problems to be noted in actual production:
1. Turn off the source of good farmyard manure. In particular, livestock and poultry excreta in large-scale farming enterprises must pay attention to controlling the content of heavy metals and antibiotics. Although some antibiotics can be eliminated after high temperature decomposing, care should be taken to prevent excessive levels of heavy metals and antibiotics in the fertilizer.
2. According to the different ratios of nitrogen, phosphorus and potassium in different kinds of farmyard manure, the ratio of various nutrients is balanced and suitable for crops.
3. When used, it is mixed with the corresponding biological fertilizer to accelerate the fermentation and decomposition speed of microorganisms to organic matter, so that the nutrients needed by the crop can be fully released, and the defects of “slow†and “long†of farmyard manure and organic fertilizer are overcome.
Although the farmer's fertilizer has the above advantages, there are still some problems to be noted in actual production:
1. Turn off the source of good farmyard manure. In particular, livestock and poultry excreta in large-scale farming enterprises must pay attention to controlling the content of heavy metals and antibiotics. Although some antibiotics can be eliminated after high temperature decomposing, care should be taken to prevent excessive levels of heavy metals and antibiotics in the fertilizer.
2. According to the different ratios of nitrogen, phosphorus and potassium in different kinds of farmyard manure, the ratio of various nutrients is balanced and suitable for crops.
3. When used, it is mixed with the corresponding biological fertilizer to accelerate the fermentation and decomposition speed of microorganisms to organic matter, so that the nutrients needed by the crop can be fully released, and the defects of “slow†and “long†of farmyard manure and organic fertilizer are overcome.
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