What to pay attention to before cotton harvest
It usually takes 70 days for cotton to be harvested from boll opening to harvest, so it must be harvested several times. The timely harvest time is generally 7 days after boll cracking, and flower harvesting generally has the following requirements:
1. Flower harvesting technology: mainly adopt "three clean" and "five points" flower harvesting method. "Sanjing" refers to the net plant, shell and ground when collecting flowers, while "five points" refers to picking, drying, storing, rolling and selling. When picking cotton, good flowers, stiff petal cotton and ground cotton should be picked separately, sunny and stored separately, and cannot be mixed together so that they can be sold at different levels.
2. Pick at the right time. After cotton bolls are opened, they are generally picked every 5 min 7 days. If picked too early, the cotton fiber is not yet fully mature, and the output and quality will be reduced; if picked too late, the cotton fiber will be pulled down, the color will be polluted, and the cotton quality will be reduced. Therefore, the cotton boll opening stage should be harvested in a timely manner to improve the cotton fiber quality and grade.
3. Prevent the rain. After the mature cotton wool encounters rain, the pigment of cotton shell, cotton leaf and wrapped leaf will pollute the cotton fiber, making the white cotton fiber appear yellow, red and gray spots, and if it encounters continuous rain, it will also cause mildew and deterioration, therefore, it is necessary to grasp the weather changes at any time, pay attention to the weather forecast, and pick cotton before the rain.
4. Spray to accelerate ripening. In the late stage of boll opening, pesticides were used to accelerate the ripening of basically mature green bolls and make them harvest flowers in advance, which can not only reduce the harm of autumn rain, increase the quality of cotton by more than 20%, but also pull stalks ahead of time for 7 days, which is beneficial to the sowing of spring crops.
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Cotton picking has knowledge, careful picking and high returns.
First, timely cotton picking is the last link of cotton production and the key to ensuring high yield and high efficiency. As cotton is an infinite inflorescence crop, it has budding, flowering, boll setting and maturity, so it needs to be harvested many times. Therefore, according to the cotton boll mature in the cracking process to complete the third stage of fiber development, that is, the fiber dehydration period, about 7 days. The water content of cotton boll shell decreased from 80% to 30%, the water content of cotton pulp decreased from 57% to 18%, and the fiber was further dehydrated and matured.
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Seed production techniques of Cotton male sterile Lines
The technology of cotton male sterile line seed production uses insect-assisted pollination male sterile line hybrid seed production method, which overcomes the shortcomings of artificial de-pollination hybrid seed production method, which is widely used at present, such as time-consuming and labor-consuming, high intensity of work, complex management of seed production field and high cost of seed production. The labor consumption can be reduced by more than 50%, and the purity of hybrid seeds can be further improved. It is the most ideal way to produce cotton hybrid seeds. The seed production technique of cotton male sterile line is to cultivate recessive low phenol markers.
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