At present, the Hengshui cotton plant has generally grown to 2 to 4 leaves, and the total seedling area accounts for more than 80% of the cotton field area. However, due to cotton sowing, the early rainfall is relatively high, the temperature is low, the lack of light photography, resulting in poor emergence of some plots, the growth and development of cotton seedlings are slow, some common disease occurs at the seedling stage; another part of the cotton field has locusts, Blind stink bugs, etc., if they are not controlled in time, it is likely to cause lack of seedlings and ridges, which will cause adverse effects on cotton production in our city. Now for the growth characteristics of cotton seedlings, put forward the following management techniques.
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First, timely sparse seedlings, nurturing strong seedlings for the large amount of sowing, emergence of good, cotton seedlings dense cotton fields, when the general growth of a true leaf, timely sparse seedlings, weak seedlings, diseased seedlings, so that cotton leaf is not Putting leaves to prevent the crowding of cotton seedlings and the occurrence of competition for fertilizers, competition for water, and glory, is conducive to individual development, avoiding the formation of tall seedlings, and is conducive to the cultivation of strong seedlings. In view of the fact that the temperature in May is low and seedling diseases are heavy, it is recommended that Ding seedlings be postponed as appropriate. When 3 to 4 true leaves are present and the stems have begun to lignify, the seedlings will be set. Salt and alkali, can be determined as late seedlings. When setting seedlings, attention should be paid to mastering the density. The density of seedlings is particularly important for cotton field management and cotton production. Cotton planting density must be based on soil conditions and planting varieties. Generally speaking, the high-water fertility of 2000-2500 plants/mu, the medium-water fertilizer field 3000 plants/mu, and the thin or saline-alkaline land 4000 plants/mu. The density is too high or too small is not conducive to the improvement of cotton yield.
Second, the cultivator loose soil, increase the temperature generally seedling period should be combined with weather conditions cultivating 3 to 4 times. When drought occurs, it should be carried out in shallow water. When there is a lot of rain, it should be used to increase temperature and humidity. The depth of cultivating is generally no more than 5 cm, and the bud period is deepened to about 8 cm. During the cultivating process, the soil on the membrane can also be removed, so that the plastic film can receive the sunlight in time, raise the temperature, and accelerate the growth of cotton seedlings.
Third, timely top-dressing, reasonable irrigation cotton seedlings usually do not need irrigation. However, the lack of base fertilizer or fertility itself is poor, cotton seedlings grow poorly, obviously defertilized fields, can be applied after the rain or irrigation before the Mu 3 to 5 kg of urea. Any replanting planted cotton seedlings should be partial to partial drinking, promoting small seedlings to catch large seedlings, and promoting weak seedlings to turn strong seedlings. Watering should be done with a small amount of water, and the use of alternate ditch irrigation should be good. After pouring, it should be timely tilled and protected. The cotton-cotton intercropping field, seedling stage is exactly the period of wheat grain filling, and the water consumption is large, which can easily cause water shortage and drought of cotton seedlings. Watering should be timely. Especially after the wheat harvest, timely grab water, cultivator eradication, and promote the growth of cotton seedlings. The melon-cotton interplanting plots should be cleaned in time after the harvest of watermelons, cultivating vines, cultivating stubble, fertilizing irrigation, and bred seedlings to promote early-onset. Can also be combined with pest control foliar spray fertilizer, such as 0.2% potassium dihydrogen phosphate solution and 1% urea aqueous solution to promote seedling robust.
Fourth, timely prevention and control of pests and weeds, cotton aphids have a pod strain rate of 30%, after the fixed seedling pod roll leaf strain rate of more than 5%, can be sprayed 5% acetamiprid 1000 times, 10% imidacloprid 1500 times Such as prevention and control; on the ground tiger can take poisonous soil, poison bait trapping method, older tigers can be used to trap and kill paulownia leaves; in June to pay attention to the prevention and control of blind stinkbugs, blind stink bug damage cotton plant rate reached 10%, or found 100 plants When there are 1-2 adult nymphs, they can be controlled by 40% of malathion 1000 times or sprayed with fluorescein cyanide 1500 times. Generally, spraying is conducted in the afternoon (after 5 o'clock). The growing point and other young parts. Diseases such as anthracnose and blight can be controlled by spraying 50% carbendazim 500 times solution or 70% mancozeb 1000 times solution. Pest control can be used continuously for 7 days. For weedy plots, weeding should be done in time; for plots that have been ventilated, seedlings with low humidity should be soiled in a timely manner; where the humidity is high, the seedlings should not be surrounded by soil and should be soiled immediately after scabbing. Reduce grass damage.
Fifth, scientific control, regulate the growth of insect-resistant cotton due to the early growth and development should be promoted mainly. Chemical control should grasp the principle of light control, see the heavens, see the land, see the flexible use of cotton seedling growth. For the long-growing field, in the after-seedling mu, the Great Wall brand shrinks 0.3 to 0.5 grams, 20 kilograms of water, and evenly sprays the top of the cotton plant. The control promotes strong growth and promotes early fruiting. Lei. Guamtaotao farming, promote the use of shrinkage soaking seed, without soaking seedlings can be used after spraying the cotton seedlings after the above method, can inhibit excessive growth of cotton, solve the tall seedlings and coordinate with the watermelon, melon and other sets of crops to win light, fight The contradiction between water and fertilizer. For the small plots of cotton seedlings, it is recommended that no control be carried out during the seedling period.
Sixth, timely repair cotton, timely removal of film First, when cotton seedlings grow 7 to 8 true leaves began budding, did not engage in simplified cultivation and excessive density of plots to timely remove the fruit branches below the leaf branch, erased Axillary buds, do a good job of fine cotton repair; to adopt simplified cultivation of cotton fields, according to space, leaving 1 to 3 leaf branches, both to make full use of space, but also early peaches, to prevent excessive growth of nutrients, coordination of nutrition for the bud period Growth and reproductive growth lay a good foundation. The second is that no special weather will not be removed in May. Due to the low temperature at night, the young seedlings of cotton seedlings will be easily formed. Once the young seedlings are formed, they will have a great impact on the production of high-yield shelves. If there are more rainfall and higher humidity land, it is necessary to change the method of uncovering the film in late June. The film removal time should be advanced. At the same time, planning should be carried out to promote the roots to lower and cultivate strong seedlings; if there is too little rain, Or drought, it is necessary to remove the film later to improve the ability of the soil to maintain drought resistance.