During the whole growth period, cotton needs obvious less than one less dynamic law, that is, the emergence of a seedling bud (May 5 to June 15) is less; the bud is blooming (June 15 to 7) On the 10th of the month, the fertilizer needs to increase rapidly; the flowering one (the July 10th to the end of August) needs the highest peak of fertilizer; the harvest of the vomit (after the end of August) is gradually reduced. According to the law of fertilizer demand in cotton life, the main points of cotton topdressing are determined:
1. Lightly applying seedling fertilizer: On the basis of sufficient base fertilizer and uniform emergence of seedlings, it is possible to apply lightly or without seedling fertilizer; in the wheat-cotton cotton field without applying base fertilizer, after harvesting wheat, combined with cultivating, cultivating and watering, timely application of seedling fertilizer For the application of cotton special formula fertilizer 10-15 kg or urea 7-10 kg. When the cotton seedlings in the cotton field are high, short, strong, and weak, the short and weak seedlings should be biased, weakened and strengthened, and the weak seedlings can be eliminated from the nutrients, and there is no bud and no flowering.
2, steady application of bud fertilizer: cotton buds, began to appear fruit branches, the need for fertilizer to increase rapidly, should be appropriate fertilizer to supplement the lack of nutrients. The bud fertilizer should be applied steadily and skillfully to promote the combination and promote control. Generally, the special fertilizer for cotton is 25-30 kg per mu. If it is not too early to pay attention to the application of nitrogen fertilizer, it should be carried out in the Shenglei period.
3, re-apply flower bell fertilizer: According to the fertility characteristics of the early stage of the anti-insect cotton, the flower bell fertilizer should be applied early and reapplied, so as to "flower and bell". The fertilization time is mastered when a bell with a diameter of 2 cm or more is sitting in the lower part of the flowering (July 15 to 20), and 15 to 20 kg of urea is applied per mu. Fertilization should be based on cotton phase and weather changes. The base fertilizer and bud fertilizer should be applied less, and the cotton field with thin soil and weak cotton plant should be applied to promote the growth of peach in the lower part of the plant.
Replenishing the topping fertilizer: Generally, in early August, the cotton enters the boll opening period, and the growth amount is gradually weakened. In this period, the appropriate amount of the topping fertilizer can serve the upper autumn peach, and at the same time, the quality of the autumn peach cotton can be improved. Can be used to chase urea 3 to 5 kg, and combined with pest control can be used for foliar spray fertilizer. It can spray 1% urea solution and 0.5% superphosphate solution, spray 1-3 times according to the growth of cotton plants.
Huaxian Agricultural Technology Promotion Center Shang Hongyan
1. Lightly applying seedling fertilizer: On the basis of sufficient base fertilizer and uniform emergence of seedlings, it is possible to apply lightly or without seedling fertilizer; in the wheat-cotton cotton field without applying base fertilizer, after harvesting wheat, combined with cultivating, cultivating and watering, timely application of seedling fertilizer For the application of cotton special formula fertilizer 10-15 kg or urea 7-10 kg. When the cotton seedlings in the cotton field are high, short, strong, and weak, the short and weak seedlings should be biased, weakened and strengthened, and the weak seedlings can be eliminated from the nutrients, and there is no bud and no flowering.
2, steady application of bud fertilizer: cotton buds, began to appear fruit branches, the need for fertilizer to increase rapidly, should be appropriate fertilizer to supplement the lack of nutrients. The bud fertilizer should be applied steadily and skillfully to promote the combination and promote control. Generally, the special fertilizer for cotton is 25-30 kg per mu. If it is not too early to pay attention to the application of nitrogen fertilizer, it should be carried out in the Shenglei period.
3, re-apply flower bell fertilizer: According to the fertility characteristics of the early stage of the anti-insect cotton, the flower bell fertilizer should be applied early and reapplied, so as to "flower and bell". The fertilization time is mastered when a bell with a diameter of 2 cm or more is sitting in the lower part of the flowering (July 15 to 20), and 15 to 20 kg of urea is applied per mu. Fertilization should be based on cotton phase and weather changes. The base fertilizer and bud fertilizer should be applied less, and the cotton field with thin soil and weak cotton plant should be applied to promote the growth of peach in the lower part of the plant.
Replenishing the topping fertilizer: Generally, in early August, the cotton enters the boll opening period, and the growth amount is gradually weakened. In this period, the appropriate amount of the topping fertilizer can serve the upper autumn peach, and at the same time, the quality of the autumn peach cotton can be improved. Can be used to chase urea 3 to 5 kg, and combined with pest control can be used for foliar spray fertilizer. It can spray 1% urea solution and 0.5% superphosphate solution, spray 1-3 times according to the growth of cotton plants.
Huaxian Agricultural Technology Promotion Center Shang Hongyan
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