As we all know, organic fertilizer is an ideal base fertilizer in agricultural production. In fact, as long as the method is appropriate and scientifically applied, it can also be used as top dressing to timely supplement the phased demand for nutrients during the growth and development of crops.
Organic fertilizer topdressing methods include soil application and root topdressing. For soil application, it should not be applied too deep into the soil layer. Generally, it should be applied near the dense root layer and cover the soil after application to avoid loss of nutrients by volatilization. Extra-root top dressing is to mix organic fertilizer and water evenly in a ratio of 1:10, and pour the supernatant liquid into the sprayer after standing still, and spray it evenly on the front and back of the crop leaves for absorption by the leaves.
When applying organic fertilizer as top dressing, it should be noted that:
1. Apply after decomposing. Because organic fertilizer is processed from biological materials, animal and plant wastes, and plant residues, these materials often contain harmful substances such as pathogens. Direct application to the soil will affect the growth of crops. It should be accumulated and fermented. Use after decomposing.
2. Control the dosage. Although organic fertilizer contains many kinds of nutrients, the content is relatively low. Therefore, only a large amount of application can meet the nutrient requirements of crops. But it's not that the more you apply, the better. Generally, 1500-2000 kg/mu per quarter are applied in farmland; fruit and tuber vegetable crops require a large amount of fertilizer, generally about 2000 kg; while green leafy crops require less fertilizer, about 1500 kg.
3. Use with chemical fertilizers. Organic fertilizer is full of nutrients, but it is often in short supply when crop growth requires fertilizer peak; chemical fertilizer is easy to decompose, which is good for crop absorption, but the stamina is insufficient. The combination of organic fertilizer and inorganic fertilizer can meet the fertilizer requirement of crops.
4. Cooperate with biological fertilizer application. The beneficial bacteria in biological fertilizer can accelerate the decomposition of organic matter in organic fertilizer, and can also decompose and transform harmful substances in organic fertilizer. For topdressing, 20-25 kg of chemical fertilizer can be applied per mu.
5. Topdressing high-quality organic fertilizer. During the rapid growth of crops, a large amount of nutrients such as nitrogen and potassium are needed. Generally, the content of nitrogen and potassium nutrients in organic fertilizers is not high. In order to ensure the rapid growth of crops for nutrients, high-quality organic fertilizers with higher nitrogen and potassium nutrients should be selected .
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