Cotton Bud Developmental Characteristics and Fertilizer Management

Fertility characteristics of cotton bud stage Cotton has entered the period of vegetative growth and reproductive growth from the bud, but it is still dominated by vegetative growth. The photosynthetic products of the bud stage mainly transmit to the vigorously growing parts of the main stem and the fruit branches, and rarely provide buds. With the rising of temperature, the growth of cotton roots, stems, leaves, fruit branches and flower buds has been accelerated, the metabolism of plants has become more and more vigorous, the physiological activities have been enhanced, the photosynthetic productivity is high, and the growth of roots has reached a flourishing stage. This period of management is mainly strong and stable, and has a good shelf.

In the normal period of budding cotton, the long-term budding cotton must be “strong but not prosperous and stable but not declining”. That is, on the basis of early-onset strong seedlings, the strong and stable trees should be grown so that the rooted plants are robust and budding. Lei Duo, but also to prevent leggy. The normal growth period of buds is long and thick. The stems are thick, the main stem internodes are compact, the red stems account for 60%; the value of the plant width is greater than the height; the top heart sag is fat, strong positive; the leaf size is moderate, the leaf color is oil green; the fruit branch is robust and budding. Large, many buds; an average of three fruit trees grow in about three days. The daily growth of the main stem increased from 0.3 cm at budding to 1 to 1.5 cm, and reached 2 to 2.5 cm at the bud stage. See flower height 50 to 55 cm, there are about 10 fruit branches, more than 20 buds.

Reasonable fertilizer and water 1, steady fertilization. The amount of fertilizer required during the cotton bud stage was significantly higher than that at the seedling stage. Fertilization should be flexibly controlled according to the growth of cotton plants, soil fertility, and weather conditions. Soils with good fertility, adequate fertilizer at the bottom, and flourishing cotton fields should not be topdressed with available nitrogen fertilizers, but may be topped with cake and potash. 25-30 kg of cake fertilizer per acre and 10-15 kg of potassium fertilizer. Medium-grade cotton fields, with adequate fertile feet and good cotton seedlings, can produce nitrogen, phosphorus and potassium compound fertilizers of 10 to 15 kg per acre; soil fertility is poor, base fertilizer is insufficient, and cotton seedlings grow poorly in cotton fields. Nitrogen fertilizer, in the early buds generally topdressing urea 5 ~ 7.5 kg per acre. It is advisable to apply fertilizer about 30 centimeters away from the cotton plant so that it can be deeply applied and repressed, which can not only fully exert the fertilizer effect, but also prevent fertilizer damage.

2, Qiao water. Bud stage cotton requires 10 to 30 cm of soil moisture to maintain 60 to 70% of the maximum water holding capacity in the field. When it falls to 50%, it should be immediately watered to prevent drought. In order to ensure that the cotton seedlings are stable and long, avoid flooding with flood irrigation, and conduct alternate furrow irrigation, watering 30 cubic meters per acre. After watering buds, it is necessary to plough the soil in a timely manner, remove the compaction, promote root barrow, and enhance the capability of drought resistance and drought resistance in the later period.

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