Cakes are usually fermented before they can be used. Because the nutrient elements contained in the cake fertilizer are organic, the plant should not be directly absorbed; the cake fat contains a certain amount of oil, and the decomposition is slow, and the content of soil moisture is reduced, which is not conducive to the absorption of nutrients by the plants; The produced acid substances have an obstructive effect on seed germination and radicle development; cake fertilizer can produce high temperatures during fermentation and decomposition, and it is a thermal fertilizer. If it is improperly applied, it may cause burning of roots or affect seed germination. Cakes with more oil and fat must be fermented before they can be used. Some cakes, such as bean cakes, have a small carbon-nitrogen ratio and are relatively quick to decompose and can be applied directly; they have little effect on crops.
Cake Fermentation: The cake fat is steamed in a steamer to fully absorb water vapor and heat, and then the cake fat is put into a sealed cylinder. In the winter for 4 months and summer for 2 months, it is naturally fermented and dried after being opened. The cake fat is directly chopped and crushed together with compost and manure for 2-3 weeks; or the decomposed manure urine is added to the cracked cake and used together for 2-3 weeks.
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