Observation on the application of quasi-flower and boll fertilizer to cotton peach

In the middle and later stages of cotton growth, flower and boll fertilizer should be applied accurately according to the changes of peach and leaf color. Generally, the soil fertility is good, the seedling bud is fat, the bud florescence is prosperous, the leaf is large, the leaf color is dark, the Internode is sparse, the bract leaves do not wrap the bud tightly, the peach is few, and the leaf color does not fade when the first flower is blooming, so the boll fertilizer in the cotton field can not be applied early, but should be pushed to increase the number of peaches and apply it when the leaf color turns light. On the contrary, if the soil fertility is poor, the amount of seedling bud fertilizer is small, the growth of bud is weak, the leaf is small, the leaf color is light, the Internode is short and thin, the bract leaf color is light, the bud is few, and the leaf color is yellowish at the early flowering stage, 5kg urea relay fertilizer can be applied per mu, and then the flower and boll fertilizer can be applied in time at the flowering and boll stage.

The application of flower and boll fertilizer varies from variety to variety. For varieties with concentrated bolls and early maturity and easy senescence, bud fertilizer should be applied early to make the peak of fertilizer efficiency coincide with the peak of flowering and fruiting peach. In addition, if the summer drought is early, the temperature is high and the soil water evaporation is large, the cotton with normal leaf color and peach should be applied in advance. The plots with poor soil quality, weak growth and little fertilization in the early stage can not wait until the flowering and boll stage, and the peach and leaf color should be fertilized in advance to the early flowering stage. As for late-growing cotton, as long as it grows well and bears less peaches, it can not be applied early, and the dosage can not be too much to ensure stable growth and early bearing peaches. The soil fertility is good, the early stage fertilizer is more prosperous, the flower and boll fertilizer can be postponed until the leaf color fades after the peach fruit.

The amount of flower and boll fertilizer depends on peach and leaf color. Generally, there are many peaches, the leaf color fades quickly, the dosage of early fertilization time is more; the amount of peach fruit is less, the leaf color fades slowly, and the dosage of late fertilization time is less, so it is better to choose urea with long fertilizer effect and apply 10-15 kg per mu.

The flower and boll stage is the high temperature season, the deep application of flower and boll fertilizer can improve the fertilizer efficiency, which is generally required to be 10 cm deep and 15 cm away from the cotton plant. If the premature senescence trend is found in the land where flower boll fertilizer has been applied, 1 kg urea plus 150 kg 200 g potassium dihydrogen phosphate per mu can be foliar sprayed with 80 kg 100 kg water to increase boll weight, promote early maturity and improve quality and yield.