Main attack objectives: reduce the flower bell shedding, increase the flower ring, increase the bell weight.
1. Reproductive process management objectives
The toppings begin in late June, the number of fruit branches is 7-8 moss, the height of the plant is about 65-70 cm, and the leaves are 13-15.
Fertility process management goals: starting from June 23-25, the number of fruit branches is 7-8 moss, the plant height is 65-70 cm, and the leaves are 13-15.
1. Growth standards for strong seedlings, strong seedlings and weak seedlings at the initial flowering stage
Growth and appearance standards of strong seedlings at the beginning of flowering: Growth and appearance standards of strong seedlings at the beginning of flowering: daily length of 1.8-2.0 cm, leaves 11-12 pieces, fruit branches 5-6, moderate leaf size, slightly darker leaf color, stretching of growth points, red stem ratio of about 60%, group flowering.
Seedling standards at the beginning of flowering: daily growth of more than 2.0 cm, leaf hypertrophy, bright green and shiny leaf color, dark green plant, young green stem of the main stem, broken when touched, the middle main stem internodal length of more than 7 cm, small buds, late flowering.
Weak seedlings at the initial flowering stage grow in appearance: the leaf color is gray-green, lifeless, the growth point is tightened and pimple-like, the plant is short, thin, the leaves are small, and the flowering is late.
2. Standards for the growth of strong seedlings, strong seedlings and weak seedlings at the peak of flowering
At the peak of the flowering period, the growth of strong seedlings is standard: the height of the plant is 70-80 cm, the fruit branches are about 8 mosses, the leaf size is moderate, not hypertrophic, the leaf color begins to fade, the flowering amount is more than 50%, the red stem is 70%, and the large line seems to be sealed from a distance.
In the blooming stage, the seedlings grow and look: the plant is tall, the height of the plant is more than 85 cm, the length of the main stem internodes is more than 7 cm, the leaves are large and thick, the leaves are dark green, the main stem is thick and tender green, the upper part is brittle and easy to break, the amount of flowering is small, the fruit branches are too long, the tender green is easy to break, and the node length between buds and buds is more than 8 cm, and it is small.
Weak seedlings grow at the peak of the flowering stage: the plant is thin, the leaves are small, the culture is small, the leaf color is gray, yellow, and there are too many naked ground.
3. Growth standards for strong seedlings, strong seedlings and weak seedlings at the bell stage
Bell period strong seedling growth appearance standard: in early August cotton field group top can be seen red, white flowers, leaf color turned dark, the plant is old and healthy, to late August, a branch and a bell, each plant average 1-2 fruit branches for 1 branch 2 bells or more bells, and the lower two leaf branches are elongated, can average 2-3 bells, the bell is full, large, spots full, the bell is strong, no shedding.
Boll period seedling growth looks: in early August, the top of the flower or rare flowers, leaf color is thick green, the plant is tall, the group hair is large, the fruit branches are long and closed, the stem is green, the buds are overgrown, and by the end of August, the middle and lower bells are still green without spots or spots, the bell is small, there are rotten bells in the lower part, and the lower fruit branches are not bells because they are closed, or the bells are small and late.
The growth of weak seedlings at the bell stage: the top of the safflower in late July, the plant is thin and small, and the large row is not sealed; in August, the red stem ratio is greater than 95%, the leaf color is light green, the upper bud is small, there is leaf spot disease or red leaf disease, and the bell is small and small.
Second, the management standard of the flower bell period
1. Regulation standards: combine water control with chemical adjustment, adjust 3-5g/mu before topping, cap control 6-8 grams/mu after topping, elongate the top fruit branches 5-7 cm, and adjust 10-15g/mu.
2. Water and fertilizer management standards:
1st water: (June 15-25), water square 25-40 square meters / mu;
2nd-5th water: (June 25-August 5), water volume 25-40 m3/mu, urea 3-4 kg/mu, potassium dihydrogen phosphate 1-2 kg/mu;
6th-8th water: (August 5-August 25) water side 30-40 square meters / mu, urea 5-8 kg / mu, potassium dihydrogen phosphate 3-4 kg / mu.
9th-10th water: (late August to early September), the amount of water is 25-30 m3/mu, the water stoppage time is about August 25, and the last water is not fertilized.
3. Topping standard: Adhere to the principle of timely and early topping. Before July 1, the cotton field is finished, and from July 10 to July 20, the group tip is beaten, the leaves and branches are removed, and the invalid flowers and fruits are removed.
4. Disease and pest control standards: strengthen field investigation, and do a good job in the comprehensive control of cotton leaf mites, cotton aphids, cotton bollworms and cotton blind aphids.
(1) Cotton bollworm, mothbell rate ≤2%, the use of light lure, sexual attraction, food trap technology to trap adult insects, reduce the amount of eggs in the field, according to the insect situation monitoring and reporting, the selection of pharmaceutical control. The control agents can choose npv, indanthine, methylphenidate, chlorfenox benzamide, fiproxactamide.
(2) Cotton aphid, at the end of July, the cotton leaf curl plant rate ≤ 10%, and the oil area of the roll leaf flow does not exceed 5% of the cotton area in the region. The control agent can choose acetamidine or imidacloprid + avermectin.
(3) Cotton leaf mites, at the end of July, the area of red leaves in a single cotton field shall not exceed 1 mu, and the cumulative area of red leaves shall not exceed 1% of the planting area of the cotton field in the area, and at the end of August, the maximum contiguous area shall not exceed 2 mu; the cumulative area of red leaves shall not exceed 3% of the planting area of the cotton field in the area. The drugs for prevention and control can be selected from alkyne mite, pyridoxine, spirosin, tetramazine, thiazone, avermectin and the like.
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