The cotton boll stage refers to the period from the early flowering to the full flowering and the full flowering to the leaf flocculation. It usually takes about 50 days. It is the most vigorous growth period in cotton. In the early flowering stage to the flowering stage, cotton grows fastest, and the branches and leaves grow most prosperously. After flowering, a large number of flowering and ringing occur. Therefore, the branches and leaves of flowering cotton at the same time in the flowering and bolling period are also the periods when the amount of fertilizer is the most. According to the research, the absorption of nitrogen, phosphorus and potassium in flowering and bolling period accounted for more than 70% of the total absorption in a lifetime. Among them, the amount of nitrogen uptake from the initial flowering stage to the flowering stage accounted for 56% of the total lifetime, and the phosphorus uptake was 24%. Absorption of potassium by 36%; nitrogen absorption by 23% from flowering stage to boll opening stage, phosphorus uptake by 51%, and potassium uptake by 42%. Therefore, we must re-apply Hua-Bing Fei to meet the needs of flowering and tying bells. If the fertilizer and water are not sufficient at this time, it will cause premature debility, increase the shedding of bells, reduce the number of bells, and reduce the yield. The correct application of cotton, flower and bell fertilizer is the key measure to win the "three peaches" knot. The specific application should be seen in seedlings, seeing the sky, and seeing the land flexibly. Usually for the premature lean, base and bud fertilizer deficiency and poor growth of the cotton fields, such as weather drought should be applied in the early flowering period, but the early flowering cotton plant branches and leaves flourishing, the amount should not be too much; for late hair, fertilizer, basal Especially in the cotton fields with adequately rich and well-developed buds, if the weather is rainy, then 2 to 3 large bells should be seated in the lower part. This is because the growth of the branches and leaves is weakened and a lot of bolls are formed. Heavy fertilizers usually do not cause leggy. Flower bell fertilizer generally accounts for about 50% of the total amount of top dressing, and 12.5 to 15 kg of standard nitrogen fertilizer is appropriate for each mu. High-yielding cotton fields should also be combined with a certain amount of phosphorus and potash fertilizers so that the cotton plants can grow steadily and are premature and not prematurely decayed. When the application should be ditching or deep-seated facilities, when the soil is dry, mixed with water pouring to increase fertilizer solution. Fusmo peach, Fumo peach and Qiu peach are called "three peaches" of cotton. Although the proportion of Fushui Peach and Sanzuo is small, it is very important. The cotton in front of Fushou Peach can be stably grown and won the initiative; Fushou is the cotton boll in the middle of the cotton plant. The quality of Zingao is good and it is the main component of high yield. Some of them are small in autumn and have poor fiber quality, but they also have a certain effect on the production. The high-yielding cotton fields require the three peaches to be tied together to increase the total number of peaches. Therefore, in order to prevent the premature decline of the cotton plants on the basis of the re-applied bell fertilizers, it is necessary to see that the seedlings cover the roof top fertilizers in order to win more knots of some peaches. Generally, cotton fields with a tendency to premature fertility due to lack of fertilizers, or cotton fields with severely falling bells in the middle and lower parts of the fields, should be covered with top fertilizer early to strive for multi-junction autumn peaches. For cotton fields with good growth, sufficient fertility, and high stamina, they should be used less frequently. Or not, so as not to become greedy and late. The top dressing fertilizer should not be applied too late. Generally, it should be applied before and after the beginning of autumn. The premature aging cotton field should be appropriately advanced. At the same time, the dosage should be strictly controlled according to the growth condition of the cotton plant and the change of the daytime after the autumn. If the amount is too much, it will cause “secondaryâ€. "Growth", the vigorous regeneration of leaves, is not conducive to the full growth of bolls, so that the weight of the bell is reduced, the quality will be degraded. Generally, the standard nitrogen fertilizer is 5 to 7.5 kg in Mushi, and it is still better to use ditch (hole) to apply it. When the soil is dry, it should be mixed with water. Source: Modern Rural News
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