Due to the recent continuous high temperature in northern Xinjiang, although Tianshan Plant Protection has repeatedly emphasized the need to enter the head water late, the current call for cotton farmers to enter the head water is still high. In order to further understand the current growth trend of cotton seedlings, Tianshan Plant Protection surveyed several cotton fields in 130 regiments on May 31, 2020, and according to the survey, talked about some views and suggestions.
First, the situation of cotton field seedlings
Judging from the cotton field survey, the field is full of seedlings, one flat and one color, the mu seedling retention rate is generally above 80%, the average plant height is 30.5 cm, the height of the first fruit branch is 26 cm, the number of fruit branches is 2, and the total number of mu fruit is 2.34. On the whole, there are more normal cotton fields, more green cotton fields, higher mu seedling retention rate and more seedlings, high fruit branches and higher legs, fast development process and early buds, and the May bud is generally realized.
Second, the view of dripping seedling water twice
Due to the high temperature and little rain during the emergence of cotton this year, especially the continuous high temperature in late April, most cotton fields generally apply 2-3 times of seedling water. On May 31, Tianshan Plant Protection conducted a survey on the cotton fields dripping with seedlings 1 time and 2 times this year, and compared with the cotton fields (a cotton fields) that dripped water 1 times and the cotton fields (b cotton fields) that dripped water twice, there was little difference between the plant height and the seedling retention rate between the a cotton field and the b cotton field, but the b cotton field had few red stems, the first fruit branches were higher, and the number of fruit branches was small. These comparative data can be seen that more drops of water, coupled with the prevalence, and the general drip of humic acid fertilizer applied twice, there is no lack of water and fertilizer, resulting in late growth and late growth of cotton fields. From the analysis of red stem ratio, cotton rod green and cotton field color, the overall cotton field is not short of water, especially the cotton field that drips out of the seedling water more than 2 times is not deficient, and it does not fully meet the goal of late entry to promote differentiation and early buds, it is recommended to adhere to the late head water (after June 10) to achieve the goal of early buds, multiple buds and large buds.
Third, the views on upgrading the cotton fields with weak seedlings in the early morning this year
From the comparative analysis of the cotton fields (c cotton fields) that did not enter the head water and the cotton fields (d cotton fields) where the weak seedlings were upgraded early in the head water, the red stems of the c cotton fields were higher than those in the D cotton fields, and the d cotton fields were still later than the overall growth and development of the c cotton fields, and the buds were late. D cotton field has no red stem, cotton rod green, cotton field yellow green (c cotton field blue green), Tianshan plant protection has issued a document, in fact, this year's weak seedling field is less, do not have to be large due to high temperature early into the head water, the head water does more harm than good, resulting in late seedlings late hair.
Fourth, the current cotton bud stage field management recommendations
(1) Suggestions for late head water, fertilization and chemical adjustment
Insist on no drought and no irrigation, and late head water is to promote the early onset of seedlings. From the current seedling situation, although the continuous high temperature weather in recent days, most of the cotton field red stem ratio is less, the cotton field color is green but no gray, the leaves are thick and shiny without wilting, the daily growth of the main stem is about 0.5 cm and has not stopped growing, the overall is still not drought, you can enter the drought-resistant seedlings, to achieve the goal of promoting the early emergence of seedlings. It is recommended to postpone the irrigation until June 10 as much as possible. When irrigating the head water, the amount of water must be large, and it is recommended that the dripping water wet over the cotton row is appropriate. Drip fertilizer should adhere to the principle of less nitrogen supplementation of phosphorus and potassium, mainly phosphate fertilizer, phosphate fertilizer can promote the early onset of seedlings, as well as the role of wang control, this year's cotton leaves are larger, the growth is large, it is recommended to apply a certain amount of urea as appropriate. It is recommended to instille 1-2 kg of potassium dihydrogen phosphate and 0.5-1 kg of urea (or 1-2 kg of monoammonium, 0.5-1 kg of potassium sulfate, 0.5-1 kg of urea). Wangchang cotton field adheres to the control of the first water before and after the water, insists on a small number of times, and rationalizes the control according to the water conditions and cotton varieties.
(2) Insect prevention is to promote early ripening
According to the survey, the recent cotton leaf mites showed a trend of multi-point spread, we must adhere to the investigation, early investigation and early treatment, control cotton insect pests in the stage of spotting. Some of the cotton field cotton blind bugs caused more leaf breaks, but also attach great importance to the occurrence of cotton blind bugs, and carry out early prevention and control work.
(3) Cultivation and weeding is to promote the early onset of early seedlings
This year, due to the emergence of cotton seedlings, high temperature and little rain, the difference between the middle line and the side line in the membrane is not large. However, from the recent survey, the BoC has a trend of being better than the border cotton seedlings, or it is recommended to carry out medium tillage operations, which play a role in eliminating soil compaction, maintaining moisture and warming and weeding. Cotton fields with more weeds must pay attention to the artificial control of weeds.
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