Treatment of several Special cases of Cotton after sowing
1. Lack of soil moisture
After cotton sowing, soil moisture should be checked in time. For cotton fields with poor soil moisture and the possibility of drying out, ditches can be opened at the edge of the seed ditch to irrigate small water; cotton fields without water irrigation conditions can be suppressed to increase soil moisture before the seedlings are unearthed.
2. Rain after sowing
In case of rain after cotton sowing, the ground is easy to harden and shell. After the rain, the soil should be cut and loosened in time to break the knot to help the seedlings unearthed. If the soil cover is too thick, you should pick the soil to save the seedlings; the seedlings can not stand the strong light of the sun, so pay attention to leaving a small amount of wet soil in the upper part of the seedlings.
3. Incomplete emergence of seedlings
After sowing, the emergence of cotton seedlings should be checked in time. Once missing sowing or rotten seeds or rotten buds are found, early replanting should be carried out; if it is found that the missing plants are broken, seedlings should be transferred and replanted immediately. Before the emergence of a true leaf, the cotton seedlings were transplanted with bud seedlings, and after the emergence of true leaves, they were transplanted with soil. No matter which transplanting method is adopted, watering should be as little as possible in order to shorten the slow seedling time. In order to prevent large seedlings from bullying small seedlings, transplanting cotton seedlings should occupy more space.
4. Encounter low temperature weather
During the period of cotton sowing and emergence, the weather is often changeable. once you encounter low temperature weather, it is necessary to hoe and increase the temperature in time, or spread plant ash along the ridge to improve the soil temperature around the cotton seedlings. When necessary, cotton seedlings can be sprayed with 25% carbendazim 500 × 800 or 70% methyl topiramate 1000 times to prevent the spread of the disease.
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Cotton pre-sowing preparation
First, soil preparation and fertilization: on the basis of ploughing and freezing in winter, base fertilizer is applied in spring, with 3 cubic meters of commonly effective organic manure and 30 kg of available ternary compound fertilizer per mu, and then ploughed, raked and leveled. After rain, it is necessary to rake again to absorb and preserve soil moisture, and enough moisture to be planted. Second, seed preparation: (1) Variety selection. Disease-resistant and insect-resistant hybrid cotton varieties are selected, such as Yuza 35, Zhongmian 47, Zhongmian 48 and so on. (2) seed selection. Select the seeds with high purity, full grains, maturity and high germination rate. (3) seed drying.
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Multiple measures for comprehensive control of cotton diseases with symptoms
Identification of the symptoms of Fusarium wilt and Verticillium wilt of cotton Fusarium wilt can occur in the whole growth and development period of cotton, but it occurs more seriously in the seedling stage, and it will also occur in the adult stage if favorable conditions are encountered. Ralstonia solanacearum type: the leaf suddenly loses water, the leaf droops and wilts, the leaf color is dark green, the leaf becomes soft and thin, the whole plant is green and dry and dies, but the leaf generally does not fall off and the petiole is curved. Yellowing type: it can occur at both seedling stage and adult stage. Most of the yellowing type occurs from the edge of the leaf, the local or whole leaf turns yellow, and finally the leaf dies or falls off, and the petiole
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