Cotton generally enters the boll opening period from late August to early September, and lasts for 70-80 days until the end of harvest. The main objectives of management during this period are: not to be greedy, promote premature, prevent premature aging, strive to get big bells, boil early, spit up, and ensure bumper harvests. Therefore, in field management, it is necessary to pay attention to the preservation of roots and leaves, improve the environment, and create favorable conditions for the development of cotton bolls and boll opening.
One, continue pruning
After cotton enters the boll opening period, it is still necessary to continue pruning work, including playing the old leaves, emptying the branches, playing the heart and so on. In particular, cotton fields that grow too busy and become greeted with greenery should undergo a thorough and comprehensive pruning to improve the ventilation and light conditions of the cotton fields, so that the organic nutrients can be supplied to the settled bolls to make them mature and boll early, and to reduce the number of rotten bells.
Second, remove the late bell
Practice has proved that removing late bells can reduce bad bells and frosty blooms, especially late-onset cotton fields. The effect of removing late bells is more pronounced because late bells are mostly late autumn peaches, and most of them are invalid peaches. Removing the late bell is beneficial to the nutrient concentration of cotton plants to supply the development of peach and early autumn peaches, increase their boll weight, and increase the pre-frost flower rate. Can also be used to control technology, generally 3-4 grams of spraying contraction Ann acres, excessive growth over cotton fields can be increased to more than 5 grams, later implementation of chemical technology, not only can improve the cotton canopy structure and ventilation and light conditions, It can also promote the premature maturity of cotton.
Third, push the strains in parallel
The cotton fields that thrive in growth, greedy greenery, and late maturation, and heavier plants close to each other, need to push the plants in parallel. The method is to push the adjacent two rows of cotton plants into a figure eight shape when the soil is moist, and then the same after 5-7 days. The method separates the original two merged lines and merges them with the adjacent ones, so that the two sides of the two cotton lines that are put together can get sufficient sunlight on the both sides of the cotton and the ground between the lines. The effect of warming the wetness reduces the rotten bell and promotes ripening.
Fourth, the cultivator loose soil
After the cotton enters the boll opening stage, the soil tends to be hardened, which will affect the respiration of the root system and the absorption of nutrients. It should be cultivating loose soil to achieve the purpose of protecting roots from premature decay. The cultivator should not be too deep to avoid damaging the roots, and 3-5 cm is preferable.
Five, outside the top dressing
In the late growth stage, the absorption capacity of the root system is weakened. In order to make up for lack of nutrients in the root system, extra-root fertilizer may be used. General mu with 2% -3% of urea water 50 kg, sprayed every 5 days, and even spray 3-4 times. Due to the large amount of rain in the early part of this year, potassium deficiency is likely to occur in the later period. Therefore, potassium should be promptly applied, 2% potassium sulfate solution can be sprayed, sprayed once every 7-10 days, and sprayed 2-3 times. For boron-deficient cotton fields, a 0.2% borax solution can be sprayed. Foliar spraying should be carried out after 4:00 pm on sunny days. Cloudy days can be carried out throughout the day. Water can quickly evaporate and the fertilizer can damage the leaves and produce fertilizer damage.
Sixth, pest control treatment
Cotton enters the boll opening stage with more insect pests. There are mainly four generations of cotton bollworms, bridge-building insects and beet armyworms. The end of the damage period is from late August to September. Field monitoring should be done well, and the hatching period should be grasped for prevention and control. Before the third instar, the control agent can use 25% diafenthiuron EC 1000 times, or 35% thiodin EC 1000-1500 times, or 20% methomyl EC 1500 times, or 2.5% KF 1500 Double liquid spray. In addition, there are pests such as whitefly, spider mite, thrips, and pheasant, which can be uniformly sprayed with 70% mancozeb WP 800 times. The main diseases are red-leaved stem blight, brown wilt and boll disease. For the red-leaf blight, it should be combined with the prevention of premature aging of cotton, spraying potassium dihydrogen phosphate solution to prevent; prevention of yellow wilt disease, cotton bollworm disease, can choose 30% evil Mildew spirit 1000 times solution or 80% ethyl allicin solution 1000 times and 70% thiophanate-methyl WP 1000 times or 70% chlorothalonil WP 800 times and other mixed solution evenly spray.
Seven, grab the rotten bell
When the age of cotton bolls reaches 40 days, in case of rainy weather, it is easy to appear bad bells. You can pick bolls that have been in the boll for more than 40 days, have yellowed shells, and begin to show dark spots. The bolls were soaked in a 1% ethephon solution and then air dried to obtain better cotton with bolls.
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