The effect of foliar fertilizer spraying on planting cotton is good.

At the later stage of cotton growth, the vitality of root system gradually declines, the absorption capacity weakens, and the supplementary application of boll fertilizer on the ground is too late to meet the needs of boll growth for nutrients. At this time, foliar fertilizer can supplement nutrition, prevent premature senescence, prevent diseases, attack big peaches, promote early maturity and compete for high quality. The effect of increasing yield and income is remarkable.

1, spray nitrogen to prevent premature senescence, cotton growth later, foliar spraying nitrogen nutrition, can make cotton leaves keep green, enhance photosynthesis, prevent denitrification premature senescence, mixed with regulator 802 spray, enhance cotton stamina effect is obvious, the effect is better. From late August to early September, spray 75 kg of 400 times urea and 4000 times 802 mixture per mu once every 5-7 days for 2-3 times continuously.

2. Potassium spraying to prevent diseases. Cotton is deficient in potassium. It is easy to cause red leaf stem blight in flowering and boll setting stage. After the disease occurs, cotton leaves become red or yellow, thicker and crispy, and finally fall off, causing premature senescence of cotton plants, which can cause serious yield loss. 0.3% potassium dihydrogen phosphate or 1% potassium chloride solution can be used per mu, or 75 kg of urea solution can be added to 100 times, spraying once every 5 days, spraying 3 times continuously, can make cotton leaves turn green quickly.

3. Spraying promotes early maturity. Spraying phosphorus fertilizer at the later stage of cotton growth can promote seed fullness, increase boll weight, and open boll earlier. Generally, it starts in late August. Each time, it is soaked in 75 kg of filtrate with 2% calcium superphosphate per mu. It can also be supplemented with 0.3% potassium dihydrogen phosphate solution.

4. Boron spraying attacks big peach, cotton lacks boron, easy to drop buds, resulting in buds without flowers or flowers without seeds, small bolls and low yield. From the beginning of boll formation, spray once every 15 days, continuously spray 3 times, spray with 75 kg of 0.2% borax solution each time.

Foliar fertilizer should be sprayed evenly before 9 a.m. or after 5 p.m. on sunny days to improve fertilizer efficiency.