Cotton fertilization should master the principle of “foot, light, steady, heavy, and supplementâ€, namely: apply enough base fertilizer, apply lightly to apply seedling fertilizer early, stabilize application of bud fertilizer, reapply flowering bell fertilizer, and apply topping fertilizer. According to the method of “suitable nitrogen, stable phosphorus, potassium increase, and micro-distributionâ€. In order to obtain high cotton yield, it is necessary to apply fertilizer scientifically due to the weather, the land, and the growth of cotton.
Cotton is a common field economic crop. The whole development period includes seedling stage, bud stage, flowering and bolling stage, boll opening stage and harvesting stage. The ratio of NPK demand during the whole growth period is about 1:0.5:0.85.
Recommended fertilization:
Basal: General Mushi right path (15-15-15) 40 kg chlorine-based compound.
Topdressing: The total growth period of cotton is about 165 days. The amount of fertilizer required varies from period to period. According to crop growth, corresponding fertilization arrangements should be made.
Miao Fei: Fertilization at the seedling stage depends on the seedlings, the fertilization on the ground, and the early application of light application. Generally, the plot is to apply 3 to 5 kg of ammonium sulfate per acre or 2 to 3 kg of urea. When the seedlings are used, the cotton field with the right compound (15-15-15) compound fertilizer can not be used to prevent the seedlings from growing.
Bud fertilizer: cotton bud period is the period of vegetative growth and reproductive growth. Therefore, it is necessary to look at seedling fertilization. One type of cotton field is mainly controlled, which promotes the transformation to reproductive growth. The second type of cotton field is controlled first, and can be promoted after the bud stage. Apply urea 2 to 3 kg. The three types of cotton fields are mainly promoted. In the Shenglei period, urea is applied to 3 to 5 kg of urea, which reaches the bud stage and the flowering period relay, reducing the purpose of bud flower shedding. If the potassium fertilizer in the base fertilizer is insufficient, at this time, 25 kg of cake fertilizer, 5 kg of potassium sulfate or potassium chloride can be applied per mu. Generally, the bud fertilizer is applied in the middle and late June, which is conducive to a stable cotton bud period.
Flower Bell Fertilizer: The flowering and bolling period is the most vigorous period of cotton growth. It needs the most nutrition and must be re-applied. At this time, supplementing fertilizer plays a key role in promoting peach-yielding, preventing premature aging, multi-junction "three peaches", and increasing boll weight. For cotton fields with high fertility and strong plant growth, the fertilizer can be applied late, and it is postponed until the first one or two large peaches in the lower stage of the flowering stage; the cotton field with low fertility and weak growth should be applied early in the early flowering stage. Generally, 10 to 20 kg of urea is applied to the mu in the middle and late July, and watering and chemical control are timely according to the weather and cotton growth.
Top-top fertilizer: In the late stage of cotton growth, if there is a phenomenon of de- fertilization , that is, the top of the main stem of the cotton plant is red early, the color of the leaf is yellowing too early, and the premature aging cotton with the topping peach is not strong enough to be applied in time. Generally, in the middle and late August, the root dressing is carried out 2 to 3 times with a mixture of 1% to 2% urea and 0.3% potassium dihydrogen phosphate. Each time interval is 7 days, 50 kg of fertilizer is sprayed per acre. Pay attention to the balance of fertilization, prevent madness, reduce the ringing of the bell, and promptly cross the fork to the top, increase the effective peach, and use the stiletto. Cotton is prone to zinc deficiency and boron, which leads to “flowers and not realâ€. It can be sprayed with 0.2% zinc sulphate and borax solution, and sprayed from the bud stage to the flower and boll stage combined with pest control, each time 7-10 days apart, spray Wet leaf surface.
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