Cotton field watering and chemical control must be done well, and the output will be high. The specific practices are as follows:
First, the watering cotton watering technology compared with other technologies, the effect variable is large, it is difficult to predict. The Spring and summer in the north are relatively dry, and some years are still not rainy until July 20. To obtain high yield of cotton, water should be watered 1-2 times during the general year and even 3 times in the dry year. However, if it is improperly watered, it will have serious consequences. The most difficult thing to master is the time and method of pouring the first water. The consequences of watering mistakes are as follows: (1) The cotton is affected by drought because it is too late or not watered, resulting in too small a nutrient body and severe premature aging. In this case, there is also a lack of fertilizer. (2) The watering is too large, and the rain is caused after pouring, resulting in the vegetative body of the cotton plant being too large, forming a long length, and the cotton field is closed. (3) The optimal time for watering is delayed, or the watering is not combined with fertilization, resulting in a large amount of bud bell falling off and atrophy of growth point, which does not have the best effect of watering.
In order to make the watering active, the first water should be properly poured early. Generally, it should be carried out in the bud period in June. The late pouring is easy to form a drought, and the flower buds fall off a lot. If the drought is not timely watered, First spray a urea solution: it can delay the formation of the bud handle from the layer, reduce the detachment of the bud flower, must be poured with small water, try to use the ditch pouring, timely tillage after watering, and then the impact of rainfall is small. If you don't have time to open the ditch, try to make a narrow and small raft. The amount of irrigation should be 25-30 square meters (equivalent to 37-45 mm of rainfall). Watering the sun on sunny days should be done before 10 am and after 4 pm to reduce the dramatic changes in ground temperature. In addition to the bud spacing, the method of judging the drought image can be determined according to the interval between the emergence of the buds and the size of the buds, and the interval between the buds and the flowering. If the leaves are found to be wilted and re-watered for a long time, the birth of cotton has been affected.
Second, chemical control and control can shape the cotton plant type, which is beneficial to the balance between vegetative growth and reproductive growth of cotton plants, and can also transform the population structure of cotton fields. It is the most suitable for increasing cotton yield and matching with appropriate increase in density. The technology of applying value.
The technical difficulty of chemical control applications is not great, mainly to understand the problem. In 2007, the author proposed that "chemical control should be before the prosperous", from the slogan on the cotton farmers can accept, but there is still a small distance to apply. When I went to the countryside service on June 14-19 last year, I saw that most cotton fields have grown 5-6 fruit branches, and the plant height is 35-40 cm. It has been prosperous, but most cotton farmers have not yet carried out the first time. Chemical control. Because cotton is not prosperous, it is difficult for cotton farmers to control. Cotton farmers also know that the festival is too long, but how to control the festival is not a must. In the north, due to the limitation of growing season, the average number of bells per plant in cotton is generally no more than 30, and it is easier to achieve 20-25. The height of the plant is not more than 1 meter, preferably 90-95 cm. For 13-14 calculations, the average internode length should be 5 cm, the total length is 65 cm, and the first fruit branch is 20-25 cm above the ground. The horizontal length of the fruit branches does not exceed 33 cm, the plant width is controlled within 66 cm, and the longest first fruit section is preferably about 10 cm. According to the calculation of 4 fruit sections, the average length of each fruit section is 7-8 cm. In fact, some cotton plants have reached more than 20 cm in the first fruit section, mainly due to late chemical control. The cotton plant absorbs the knuckle and the transfer is slow, so the place where it can not be sprayed can not control. If it is passive control, the amount of liquid should be increased, the spray width should be widened, and the spray speed should be slowed down so that each growth point can be used.
In the actual production, there are three modes in the chemical control: one is the segmental quantitative control mode, which is generally divided into four times, the former is light and heavy; the other is the multiple control mode, about 8-10 days, each time. 0.5-1 g, the latter is not aggravated; the third is to carry out the simultaneous spraying with the foliar spray, which promotes the control and control. In order to make the effect of the knuckle uninterrupted (intermittent will cause the cotton plant to grow faster and slower, it is easy to cause cotton growth rebound), I think the second mode is better. The author went to the countryside to see a lot of such situations: after the cotton farmers had controlled 1-2 times in the early stage, they saw that the effect was very good and gave up the subsequent control, which caused the cotton in the middle and late stages.
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