When organic fertilizer is used in combination with chemical fertilizer, a reasonable application method can improve the efficiency of fertilizer utilization, promote healthy crop growth, and reduce negative impacts on the environment. In order to achieve fertilization effects, the following key issues need to be noted:

Fertilization timing: Organic fertilizer should be applied as base fertilizer, while chemical fertilizer can be applied in stages to avoid fertilizer waste caused by concentrated application.

Reasonable ratio of organic fertilizer and chemical fertilizer: Effective ratio can ensure that there are both slow-release organic fertilizer nutrients and quick acting nutrients provided by chemical fertilizers in the soil. The specific proportion can be flexibly adjusted according to crop types, soil conditions, and crop growth needs.

Organic fertilizer should be applied before sowing or transplanting crops to gradually release nutrients during the early stages of crop growth. The base fertilizer of chemical fertilizers can be applied in moderation according to the needs of the soil, and care should be taken to avoid applying too early or too late.

Diversified fertilization strategy: Single use of chemical fertilizers or organic fertilizers may lead to excess or deficiency of certain nutrients in the soil. Therefore, adopting a combination of organic fertilizer and chemical fertilizer, and a reasonable combination of fertilization, can make up for their respective shortcomings and achieve a balanced supply of nutrients.

Soil condition: Adjust the fertilizer ratio based on soil testing results to avoid excessive use of chemical fertilizers causing soil acidification or nutrient imbalance.

Matching with crop demand: Different crops have different growth stages and nutritional requirements. Reasonably adjusting the ratio of organic fertilizer to chemical fertilizer can effectively improve crop yield and quality.

Organic fertilizer quality: Choose organic fertilizers that are fully decomposed to avoid immature organic fertilizers affecting crop growth or causing pests and diseases.

Fertilizer utilization rate: Avoid excessive fertilization, scientific fertilization can improve fertilizer utilization rate and reduce environmental pollution.

In summary, when reasonably combining organic and chemical fertilizers, controlling the amount of fertilizer, selecting appropriate timing and methods of fertilization, and ensuring the quality and utilization efficiency of fertilizers are all key factors in ensuring the sustainable development of agricultural production.