Can rapeseed cake be used directly as fertilizer?

SummaryRapeseed cake cannot be used directly as fertilizer. It needs to be mixed with water and fermented for 3 months. Make sure it is fully fermented before using it as fertilizer. Be careful to apply it in small amounts and frequently. If it is not fully fermented, it is easy for high temperatures to be produced during the fermentation and decomposition process, burning the crop roots to death.

1. How to use rapeseed cake fertilizer

1. Rapeseed cake fertilizer can be used to improve soil. Rapeseed cake is a by-product after oil is pressed from rapeseed. It contains about 1% phosphorus and more than 35% protein amino acids, and is a relatively good organic fertilizer.

2. To use rapeseed cake as fertilizer, first crush the rapeseed cake and crush it into powder as much as possible. Mix the rapeseed cake with water at a ratio of rapeseed cake:water of 1:7, or submerge the rapeseed cake in water. When mixing, be sure to stir the rapeseed cake and water evenly.

3. After the rapeseed cake is mixed with water, it generally takes about three months. When the mixed fermented soil turns black, the rapeseed cake no longer grows white mold, and the rapeseed cake no longer smells bad or has no odor, it proves that the fertilizer has been fully fermented.

4. When using rapeseed cake as fertilizer, the general principle is to apply it in small amounts and frequently, and not to apply too much at one time.

5. In addition, cake fertilizer that has not been fully fermented should not be used directly, because rapeseed cake fertilizer is a heat-producing fertilizer. During the fermentation and decomposition process, it produces high temperatures, which can easily burn the crop roots around the rapeseed cake to death.

6. During use, try to avoid misuse so as not to cause damage to plant roots.

2. Characteristics of fermented rapeseed cake fertilizer

1. Rapeseed cake fertilizer itself contains a large number of enzymes. When applied to the soil, it can directly increase soil enzymes. The organic matter in the soil is the substrate for enzymatic action.

2. After rapeseed cake is applied to the soil, it can increase the activity of various enzymes in the soil, increase the number of microorganisms beneficial to root growth, and to a certain extent inhibit multiple soil-borne diseases such as continuous cropping disease and Fusarium wilt.

3. The organic content of rapeseed cake is as high as 60%-70%, which can effectively raise the level of soil organic matter, increase the content of soil organic matter, enhance the soil's ability to retain water and fertilizer, promote the transformation and absorption of nitrogen, phosphorus, potassium and trace elements in the soil, and improve the soil environment.

4. Rapeseed cake is green and environmentally friendly. Fermented rapeseed cake organic fertilizer has no toxic side effects, can improve soil safety and the use efficiency of chemical fertilizers, and save production costs.

5. In addition, rapeseed cake has a relatively high fat content and needs to be decomposed in the soil for a period of time before it can be absorbed by crops. Therefore, the fertilizer effect time of rapeseed cake fertilizer is also relatively long.

3. Why rapeseed cake needs fermentation

1. Rapeseed cake contains a large amount of fiber. Direct fertilization will produce a large amount of heat energy, causing root burn or seed burn, so it must be fermented before use.

2. If it is not fermented or is not fully fermented, it may cause the rapeseed cake to undergo secondary fermentation in the soil, resulting in problems such as seedling burn and low germination rate.