What are the harms of excessive application of organic fertilizer to vegetables?

Fertilizer Jan 1, 1970 0 views

What are the harms of excessive application of organic fertilizer to vegetables? How can excessive application of organic fertilizer be prevented and controlled? We also ask experienced netizens to help explain

       Organic fertilizer can improve the physical and chemical properties of soil, enhance water and fertilizer retention, and improve the ability to supply fertilizer continuously, but excessive application of organic fertilizer can also affect the physical and chemical properties of soil, and in severe cases can cause salt accumulation in the soil and affect crop growth. Moreover, excessive input of organic fertilizer can also cause nitrate to accumulate in vegetables, and even more seriously, excessive application of organic fertilizers such as municipal waste contaminated with heavy metals can also cause heavy metal pollution of soil and vegetables. Therefore, Zhongdi Web has compiled the methods for rational application of organic fertilizer, and they are listed in detail below for netizens' reference.

        1. Choose high-quality organic fertilizer:
       High-quality organic fertilizer is the foundation of high-quality and high-yield vegetables, but most of the organic fertilizer currently applied by vegetable growers is purchased commercial fertilizer, and the quality is generally low. Some is even mixed with municipal sludge, household waste, etc., and simply does not meet the standard for organic matter content. Even some purchased chicken manure is mixed with soil, or has been adulterated by unscrupulous traders with caustic soda (used to increase volume). The effect of applying these inferior organic fertilizers to the soil can be imagined. Therefore, in production, high-quality organic fertilizer must be selected, and when choosing commercial organic fertilizer, it is best to choose one produced by a regular large manufacturer.

       2. Strictly control the application rate of organic fertilizer:
       Since applying more organic fertilizer is harmful rather than beneficial, we should control its amount in future production. So, how much should be applied per mu of vegetable field to meet the needs of vegetable production? The author believes that under normal circumstances, applying 15-20 cubic meters of pure chicken manure and 35-40 cubic meters of rice husk manure per mu of vegetable field is appropriate. Solanaceous fruit vegetables have a relatively large fertilizer requirement, so the upper limit can be used. Leafy vegetables have a slightly smaller fertilizer requirement, so the lower limit can be used.

      3. Apply in combination with biological fertilizer:
      Whether organic fertilizer is applied as a base fertilizer or as a top dressing with irrigation, it is best to use it in combination with biological fertilizer. Why combine it with biological fertilizer? Because after organic fertilizer is applied with irrigation in combination with biological fertilizer, the biological bacteria in the biological fertilizer can accelerate the decomposition of organic matter in the organic fertilizer, making it more conducive to crop absorption, and at the same time can decompose and transform some harmful substances in the organic fertilizer to avoid harm to vegetables. Therefore, when applying organic fertilizer as a base fertilizer, 150-200 kg of biological fertilizer can be applied per mu in combination, and when applying with irrigation, 20-25 kg of biological fertilizer can be applied per mu each time, with good results.

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