August cotton cultivation and management techniques

In the first half of 2014, long-term rain, low-temperature sunshine, and frequent rains in our province caused great negative impacts on cotton production. Delayed late-planting of cotton and serious shortage of seedlings. In the second half of the year, according to the provincial Plant Protection Station, it is expected that the overall trend of pests and diseases will be more serious, and the pests will be greater than the diseases. Cotton withered (yellow) wilt disease occurs more emphasis. According to another forecast made by Wuhan Regional Climate Center, the rainfall from July to August is 2-3% higher in northeastern Hubei, 1-2% higher in Jianghan Plain and southeastern Hubei, and close to normal in northwestern Hubei, where the overall temperature is slightly higher. Therefore, it is recommended that cotton be harvested in the province late this year in case of late planting, and the management of flowering and bolling period after July should be as follows:

1. Re-apply Hua-Bing Fei: When Huai-Pu-Safflower was used in Daejeon, Hua-Bing fertilizer was applied. Hua Lingfei mainly uses available nitrogen fertilizers, according to fertility and cotton growth, where appropriate, potassium fertilizer. Urea use 20 kg of urea, potassium chloride 10-15 kg, ditch application or acupuncture, when the soil is dry, fertilizer should be timely irrigation to improve fertilizer efficiency.

2. On the basis of reapplying flower and bell fertilizer, apply 5-8 kilograms of urea to cover top fertilizer before and after the beginning of autumn to prevent premature senescence, add autumnal peach, and increase boll weight. There is a lack of fertilizer and there is a trend of premature aging or a cotton field that is severely shed in the middle and lower parts. The cotton fields with good growth, high fertility, and strong stamina should be given less or less to avoid late-maturing.

3, the correct transfer: 12-14 true leaves of the main stem of the cotton plant, the use of shrinkage 2-3 grams per mu watered about 20 kilograms, foliar spray, anti-blocking line is too early; toned before and after the transfer, mu With a shrinkage of 3-5 grams, about 50 kilograms of water, control axillary buds, ineffective buds and reduce the shade of the field, and promote more bells and knots. Prosperous control measures: Appropriate control of nitrogen application of phosphorus and potassium fertilizer, make-up trace elements foliar fertilizer, see the seedlings moderately. A boron-depleted cotton field with a petiole ring was sprayed with a bag of Sonic Boron.

4. Timely topping: Follow the principle of “setting branches densely to branch timing; timing to not waiting for branches and branches to unequal hours”. Timely topping, is conducive to more bells, increase the weight. Cotton topping is generally performed before and after the beginning of autumn. The weak growth of the first to hit the top, long-term growth of the appropriate postponement to the top. To advocate a small summit, that is, to remove one leaf and one heart, and to oppose "a great deal of jealousy."

5. Anti-hazards and insect repellents: In the flowering and bolling period, the focus is on the prevention and control of Blind mites, Spodoptera litura, cotton bollworm, and whiteflies. During the flowering and bolling period, drought often occurs, soil moisture is insufficient, fertilizer is difficult to exert its effect, resulting in a large number of flower buds falling off and premature aging of cotton plants. Drought and drought irrigation early in the drought are the key measures to seize the high cotton yield. Advocate a small gutter irrigation sooner or later, and timely soil protection. Blind weeds should be particularly strengthened. Control methods: Use 45% of malathion or 5% of beta-cypermethrin or 3%-5% of acetamiprid + 40% of chlorpyrifos to control, pay attention to pesticides should be used alternately and in combination.

6. For the prevention and treatment of withered and verticillium wilt disease, use 32% of allicin 30-40 ml or 90% of yellowish wilting original powder 50-75 g or 20% of tolclofos-methyl + multi-microelement foliar fertilizer Spraying. Every 7-8 days, once in a row, 2-3 times. This side has the effect of preventing disease and protecting buds.

In late July and August, in addition to promptly knocking down the old leaves of empty branches, the cotton fields that are prosperous and greedily late or shaded are particularly severe. Create "air ducts" between the lines and increase lighting. Between 5 and 7 days, two rows are pushed outwards, alternately 2-3 times depending on the situation, which can effectively prevent the rotten bell.

8. Anti-fighting and insect repellent during boll-opening period: During the period of boll opening, we must pay attention to the effects of rain waterlogging and long-term drought weather. In case of torrential rain, it is necessary to clear the gutter drainage in time; in case of drought for more than 7 days, it is necessary to drench the small gutter and prevent the cotton bell from heating. The main insect pests in cotton boll opening period are Spodoptera litura, Bemisia tabaci, Blind mite, Red spider, Cotton thrips, Cotton bollworm, etc., and should be treated as soon as possible.

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