Compared with other technologies, cotton watering technology has a large effect and is difficult to predict. The northern part of the country is relatively arid during the spring and summer seasons. In some years, it is still not raining until July 20. In order to obtain high yields of cotton, it is necessary to water 1 to 2 times during the growth period of the average year, and even 3 waters during drought years. However, if it is improperly watered, it will have serious consequences. The most difficult part to master is the time and method of pouring the first water. The consequences of watering mistakes are the following: (1) The cotton is subjected to drought due to watering too late or not watered, causing the vegetative bodies to be too small and causing serious premature senescence. In this case, there are also fertilizers that do not work. (2) Large watering and raining after pouring cause the trophic body of the cotton plant to be too large, resulting in long growth, and severe cotton field closure. (3) The best time for watering was delayed, or the watering did not cooperate with the fertilization, resulting in a large number of shedding of the bells and atrophy of the growing point, which did not play the best effect of watering.
In order to make the watering initiative, the first water is suitable for proper early pouring. Generally, it should be carried out within the period of buds in June. The late pouring is easy to form and the drought is too heavy, and the buds fall off in large quantities. If the drought is not timely watered, First spray urea solution: can delay the formation of bud detachment, reduce bud loss, must be poured with small water, try to use ditch pouring, timely cultivator after watering, and then encountered the impact of small rainfall. If it is too late to ditch the earth, we should try to make narrow rakes, and the amount of water per mu should be 25 to 30 squares (equivalent to 37 to 45 millimeters of rainfall). Watering on a sunny sunny day should be preceded by 10 a.m. and after 4 p.m. in order to reduce drastic changes in the ground temperature. The method of judging the dry elephants can be based on the interval between buds, the size of buds, and the date of buds to flowering. If wilting and watering of the leaves are found for a long time, the growth of cotton has been affected.
Although there are more precipitation and soil moisture during the seedling period of cotton this year, if the drought persists in late June, some cotton fields that are poorly preserved and have poor water retention ability still need to be watered, otherwise they will seriously affect the production of high-yielding cotton plants. Therefore, to prepare early, it is mainly to open up the soil, so that the drought can be poured, can be arranged, but also fall down.
Second, to control
Chemical control can shape the cotton plant type, which is not only beneficial to the balance between vegetative growth and reproductive growth of cotton plants, but also can transform the population structure of cotton fields. It is one of the most useful technologies that can further increase cotton yields and appropriately increase the density. .
The technical difficulty of chemical control application is not very difficult, mainly to understand the problem. In 2007, the author proposed that “chemical control should be preceded by prosperous growth.†From the slogan, cotton farmers can accept it, but there is still a small distance in application. When the author visited the countryside from June 14 to 19 this year, he saw that most cotton fields had grown 5 to 6 fruit branches and plant heights of 35 to 40 centimeters. There had been a prosperous phenomenon, but most cotton farmers still did not perform the first time. Chemical control. It is difficult for cotton farmers to control because the cotton is not prosperous. Farmers also know that the festivals are too long, but how to control the festivals is not essential. In the north, due to the limitation of the growing season, the average number of cotton plants per plant will not exceed 30 on average, and 20 to 25 plants will be more easily achieved. The plant height does not need to be more than 1 meter, and 90 to 95 centimeters is appropriate. 13 to 14 calculations, should control the average internode length 5 cm, a total length of 65 cm, the first fruit from the ground 20 to 25 cm high. The horizontal length of the fruit branches shall not exceed 33 cm. The width of the plant shall be controlled within 66 cm. The longest first fruit section shall be about 10 cm. Calculated according to 4 fruit segments, the average length of each fruit segment is 7-8 cm. Actually, some cotton plants have reached the first fruit segment by more than 20 cm, which is mainly caused by chemical control. Cotton strains absorb quickly and transfer slowly. Therefore, they cannot control where they cannot be sprayed. If it is passively controlled, the liquid volume must be increased, the spray width must be widened, and the spray rate must be slowed down so that every growing point can be drugged.
The actual production of chemical control has roughly appeared in three modes: First, the quantitative quantitative control mode, generally divided into 4 times control, before light and heavy; second is multiple control mode, about 8 to 10 days once, each time 0.5 to 1 grams, the latter did not increase; the third is to synchronize with the foliar spray fertilizer, promote the control, control in the promotion. In order to make the effect of shrinkage uninterrupted (disruption will cause the cotton strain 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 this situation: after the farmers controlled the plant 1 or 2 times in the early stage, they saw the effect was very good and gave up the subsequent control, resulting in the cotton crop in the middle and late period.
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