Fertilizer Application in Cotton Flowering and Boll Stage
Name: cotton fertilization in flower and boll stage is fastidious.
Classification: planting techniques / principles of plant physiology and cultivation techniques
Scope of application: unlimited
Details:
The flowering and boll stage is the key period for cotton to gradually change from vegetative growth to reproductive growth, and it is also the period when cotton needs the most fertilizer.
For cotton in full bloom, because vegetative growth is still parallel to reproductive growth, partial application of nitrogen fertilizer will lead to cotton vigorous growth and crazy growth, which will not only aggravate bud and boll shedding, but also lead to premature senescence. Therefore, some cotton in the peak flowering period should mainly apply compound fertilizer, with a high content of 15kg / mu of compound fertilizer, or a small amount of urea, combined with phosphorus and potassium fertilizer. Especially in cotton fields where hybrid insect-resistant cotton is planted, it is necessary to increase the application of potash fertilizer, not less than 15 kg per mu. Fertilizers should be applied deeply during the flowering period, and soil should be cultivated to form ridges.
For cotton that has already set bolls, peach fertilizer should be applied, and peach fertilizer should be applied twice in places with large planting area of hybrid insect-resistant cotton. When there are 2 to 3 mature peaches per plant, about 15 kg of urea should be applied per mu. When there are about 10 peaches per plant on average, about 15 kg of urea should be applied again. When there are more cotton peaches, there is no need to worry about the excessive growth of urea, because after setting peaches, the direction of nutrient transport has shifted from branches and leaves to cotton bolls, and the timely supply of sufficient nutrients can not only increase boll weight and seed finger weight, but also improve quality. However, peach fertilizer can not be applied too late, too late application will only lead to late ripening of cotton.
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Seven key points of Scientific fertilization for Cotton
1. Give priority to organic fertilizer and apply sufficient base fertilizer. During soil preparation, the soil was disinfected by spraying disinfectant and 800 times solution of new high-fat film in time, and applying sufficient base fertilizer, applying 2000-3000 kg farm manure per mu to improve the ability of root system to absorb fertilizer, activate the soil, prevent consolidation and maintain the ecological balance of the rhizosphere. two。 Reduce the application of diammonium phosphate. Nitrogen, phosphorus and potassium ternary compound fertilizer should be used, or 40 kilograms of three 15 nitrogen, phosphorus and potassium compound fertilizer can be selected as base fertilizer. Cooperate with spraying when using compound fertilizer
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There are some methods to fertilize cotton at flower bud stage.
After budding, cotton entered the period of vegetative growth and reproductive growth, but still dominated by vegetative growth. During this period, it is necessary to set up a shelf for high cotton yield and fully supply the demand for cotton fertilizer at the bud stage, not only to meet the needs of cotton plants, but also to prevent excessive fertilization, resulting in cotton plant growth. For the cotton fields with low amount of base fertilizer, some mature manure and cake fertilizer can be applied at the bud stage, or a small amount of available nitrogen fertilizer can be mixed and deeply applied to make the fertilizer decompose gradually, play a role in the flower and boll stage, and spray new high-fat film at the right time, which can greatly improve the effective component rate of fertilizer.
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