Detailed Explanation of the Key Points of Formula Fertilization Technology for Cotton

Currently, it is the critical period for cotton land preparation and fertilization, in order to do a good job in cotton formula fertilization and lay the foundation for high quality and high yield. The cotton fertilization technology is now provided to the majority of cotton farmers for reference:

1. Pay attention to the application of farmyard manure: farmyard manure can improve the soil, enrich soil fertility, and contains various nutrient elements needed by crops, providing what crops need for growth. It has complete nutrition and is rich in organic matter, and has a significant effect on improving the soil and increasing the utilization rate of chemical fertilizers.

2. Increase the application of phosphate fertilizer: phosphorus has low mobility in the soil and dissolves and releases slowly, and is not easily absorbed by crop roots, so phosphate fertilizer should be applied as a base fertilizer. In production, phosphate fertilizer is often mixed with decomposed organic fertilizer before application. To prevent phosphorus from being fixed by the soil, generally concentrated deep application of phosphate fertilizer has a better effect.

3. Supplement potassium fertilizer: From emergence to squaring, cotton absorbs about 24% of the potassium for the entire growth period, from squaring to flowering about 42%, and from flowering to maturity about 34%. Therefore, potassium fertilizer should be applied as a base fertilizer or as a top dressing before squaring, so as to benefit the early growth of cotton and focus on meeting the needs of boll, flower, and boll development. The general application rate of potassium fertilizer is about 10-15 kg per mu, which is more suitable.

4. Adjust the nitrogen ratio: Farmers have long applied excessive nitrogen fertilizer, causing the loss and waste of nitrogen nutrients, and also causing a serious imbalance in the ratio of nitrogen, phosphorus, and potassium. According to different soil fertility levels, applying nitrogen fertilizer reasonably and adjusting the relationship among nitrogen, phosphorus, and potassium can effectively unleash the yield-increasing potential of fertilizers and achieve twice the result with half the effort.

5. Spray boron fertilizer: Sufficient boron can not only promote flower organ development, help pollination and improve the seed-setting rate, but also accelerate the transport of carbohydrates within the plant, increasing single boll weight and lint percentage. Therefore, during the squaring stage, early flowering stage, and full flowering stage of cotton, applying a 0.2 borax solution once each has a certain promoting effect on the healthy growth of cotton.