Fertilizers are essential for providing nutrients to cotton plants, and in addition to using microbial fertilizers to supply these nutrients, it's crucial to enhance the population of beneficial microorganisms in the root zone of the soil. This helps improve the soil's microbial community, enhance its aggregate structure, and balance its physical, biological, and chemical properties to achieve optimal soil fertility. Microbial fertilizers are commonly used during the seedling stage, as a base fertilizer, and as a topdressing during the boll development phase.
For the nursery stage, when preparing nutrient soil for transplanting, 5 kg of bio-organic fertilizer can be mixed into each cubic meter of soil. This not only promotes healthy seedling growth but also helps prevent diseases. When applying basal fertilizer in the field, about 50 kilograms of bio-organic fertilizer per acre is recommended, as it has a good retention capacity and supports long-term nutrient availability.
During the boll formation stage, 20–25 kg of black and white biological fertilizer is applied as a topdressing. In areas with poor soil texture or low fertility, the application rate should be increased accordingly. Additionally, during the mid to late growth stages of cotton, one kilogram of microbial agent is mixed with 20 liters of water. After stirring and letting the mixture sit for an hour, the supernatant is combined with zinc and boron fertilizers and sprayed onto the leaves. This practice strengthens the plant’s resilience, improves its growth, and helps reduce the occurrence of yellow wilt disease.
From *Modern Fertilization Collection* by Zuo Guangsheng.
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