1.Causes soil salinization
If chicken manure is used for years, a large amount of sodium chloride remains in the soil. Too much salt will seriously restrict the permeability and activity of the soil. The solidification of important elements such as phosphate fertilizer, potassium fertilizer, calcium, magnesium, zinc, iron, boron and manganese restricts the improvement of crop yield and quality.
2.Burning roots and seedlings
It is easy to cause plant disease and death if chicken manure is not thoroughly fermented. If you insert your hand into the soil after using the chicken manure which is not thoroughly fermented, you will feel the soil temperature is higher. This is the second fermentation of raw manure in the soil. Especially in spring and summer, when the temperature is high in the greenhouse, the secondary fermentation of raw manure will emit a lot of heat, which is easy to cause root burning
3.Bring in antibiotics
Nowadays, in large-scale livestock and poultry breeding, a large number of antibiotics are used to improve feed utilization and promote animal growth. About 70% of antibiotics can not be absorbed after use, so the content of antibiotics in animal feces is generally high. The antibiotics contained in unrolled chicken manure will seriously affect the physiological process of crop roots and significantly inhibit its growth.
4.Breeding of root knot nematodes
Chicken manure is the camp and hotbed of root knot nematodes. The number of eggs carried by chicken manure is 100 per 1000 grams. The nematodes are extremely sensitive to chemical agents. After spraying, the nematodes will quickly move to the depth of 50 cm-1.5 m underground to escape. The nematode eggs in chicken manure are easy to hatch and multiply by tens of thousands overnight, so it is difficult to eradicate the disease.