Topdressing is an important measure for cotton to knot more bells, knot large bells, reduce shedding, and increase yield. However, if the topdressing does not speak science, it will not achieve the desired effect, and sometimes it will have side effects. In production, cotton topdressing has the following four points.
First, according to the need for fertilizer law. The different growth stages of cotton have different amounts of fertilizer absorption. Generally, the nitrogen uptake of cotton plants at seedling stage accounted for 6.36% of the total nitrogen absorbed by a lifetime, the absorption phosphorus accounted for 5.19%, and the absorbed potassium accounted for 9.62%; the absorbing nitrogen in the bud stage accounted for 34% of the total nitrogen absorption in a lifetime. 95%, absorbing phosphorus accounted for 21.04%, and absorbed potassium accounted for 31.31%; during the flowering and bolling period, nitrogen absorbed accounted for 56.88% of total nitrogen absorption, 72.74% of phosphorus and 55.88% of potassium. . According to the law of cotton fertilizer demand, master the principle of top dressing, light bulb, buds, flower bells and late supplements. The seedling stage is 5 kg of urea per acre to promote seedling growth. During the bud period, 7.5 kg of urea, 20 kg of phosphate fertilizer, and 7.5 kg of potassium fertilizer were combined, and the nitrogen, phosphorus and potassium were combined to make the cotton plant stable. During the flowering and bolling period, the urea was chased by 12.5 kilograms, which met the need for fertilizer at the peak of fertilizer demand, and the knotted bell was knotted. In the later stage, there is a cotton field with premature aging tendency, and 5 kg of urea is chased to prevent premature aging.
The second is to look at the lyrical topdressing. The soil is good, the fertilizer is easy to dissolve, and the fertilizer efficiency is good; the soil moisture is poor and the fertilizer efficiency is also poor. If the soil is dry, the sensation is insufficient, and the topdressing can be followed by watering and topdressing. Do not top dress after watering or topdressing while watering, so as to prevent fertilizer from escaping into the ground and draining.
The third is the topdressing after the rain. Don't let the rain spread the fertilizer, as the rain, you can topdress after the rain. If the rain is applied, the amount of precipitation is small, the fertilizer is scattered on the surface, and it is easy to volatilize after the weather; the amount of precipitation is large, and the fertilizer is lost with water or infiltrated into the ground, and the roots are not absorbed.
The fourth is deep application of topdressing. Deep application of topdressing is an important measure to prevent fertilizer loss and improve fertilizer efficiency. It is better to apply the ditch strip or the hole, the depth is generally 10 to 14 cm, and the soil is covered after fertilization. This way the sun can't be sunburned, and it won't run when it rains, which is good for root absorption.
First, according to the need for fertilizer law. The different growth stages of cotton have different amounts of fertilizer absorption. Generally, the nitrogen uptake of cotton plants at seedling stage accounted for 6.36% of the total nitrogen absorbed by a lifetime, the absorption phosphorus accounted for 5.19%, and the absorbed potassium accounted for 9.62%; the absorbing nitrogen in the bud stage accounted for 34% of the total nitrogen absorption in a lifetime. 95%, absorbing phosphorus accounted for 21.04%, and absorbed potassium accounted for 31.31%; during the flowering and bolling period, nitrogen absorbed accounted for 56.88% of total nitrogen absorption, 72.74% of phosphorus and 55.88% of potassium. . According to the law of cotton fertilizer demand, master the principle of top dressing, light bulb, buds, flower bells and late supplements. The seedling stage is 5 kg of urea per acre to promote seedling growth. During the bud period, 7.5 kg of urea, 20 kg of phosphate fertilizer, and 7.5 kg of potassium fertilizer were combined, and the nitrogen, phosphorus and potassium were combined to make the cotton plant stable. During the flowering and bolling period, the urea was chased by 12.5 kilograms, which met the need for fertilizer at the peak of fertilizer demand, and the knotted bell was knotted. In the later stage, there is a cotton field with premature aging tendency, and 5 kg of urea is chased to prevent premature aging.
The second is to look at the lyrical topdressing. The soil is good, the fertilizer is easy to dissolve, and the fertilizer efficiency is good; the soil moisture is poor and the fertilizer efficiency is also poor. If the soil is dry, the sensation is insufficient, and the topdressing can be followed by watering and topdressing. Do not top dress after watering or topdressing while watering, so as to prevent fertilizer from escaping into the ground and draining.
The third is the topdressing after the rain. Don't let the rain spread the fertilizer, as the rain, you can topdress after the rain. If the rain is applied, the amount of precipitation is small, the fertilizer is scattered on the surface, and it is easy to volatilize after the weather; the amount of precipitation is large, and the fertilizer is lost with water or infiltrated into the ground, and the roots are not absorbed.
The fourth is deep application of topdressing. Deep application of topdressing is an important measure to prevent fertilizer loss and improve fertilizer efficiency. It is better to apply the ditch strip or the hole, the depth is generally 10 to 14 cm, and the soil is covered after fertilization. This way the sun can't be sunburned, and it won't run when it rains, which is good for root absorption.
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