Jinnan District Agriculture and Forestry Bureau reminds cotton farmers to master the classification and management of cotton flowering and boll stage.
Cotton from 50% flowering cotton plants to 50% mature bolls called flowering boll stage. Cotton in Tianjin City generally enters the flowering and boll period from the beginning of July to the end of August. This period is the key period to determine cotton yield. It is hoped that cotton farmers will pay attention to the growth trend of cotton in the field and adjust technical management measures at any time. According to Gao Qingming, Cotton Research Institute of Hebei Province Academy of Agricultural and Forestry Sciences, cotton fields are divided into four grades: excessive length, strong, general and thin according to morphological indexes such as cotton plant growth amount in flowering and boll period. The main indexes of the four grades are as follows: ① plant height of cotton field with excessive length is more than 70 cm at initial flowering stage, more than 100 cm at full flowering stage, daily increase of plant height is more than 3 cm, red stem is 60% higher than initial flowering stage, 75 ~ 80% at full flowering stage;(3) The plant height of cotton field is 40~ 50cm at initial flowering stage, 70~ 75cm at full flowering stage, the daily increase of plant height is less than 2cm, the red stem is 80% higher than that at initial flowering stage, and the full flowering stage reaches 95%;(4) The plant height of thin cotton field is about 35cm at initial flowering stage, the full flowering stage does not exceed 60cm, the daily increase of plant height is 1.5cm, the red stem is 90% higher than that at initial flowering stage, and the full flowering stage is 95%.
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Jinnan District Agriculture and Forestry Bureau reminds cotton farmers to master the management techniques of cotton flowering and boll stage.
The flowering and boll period of cotton in Tianjin generally begins in early July and ends at the end of August, which lasts 55 days. According to the survey, most of the cotton fields in our district have entered the flowering and boll stage. The field management of flower and boll stage is very important, which is the most exuberant period of cotton growth and development, a period of complex contradictions between vegetative growth and reproductive growth, individuals and groups, cotton crops and environment, so it is a period to determine yield. The cotton field management in this period should pay attention to the following key aspects: 1. Increase the application of potash fertilizer.
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Cultivation Techniques of Cotton Variety Jinmian 412
Sowing period: open field direct seeding April 25 - 30, plastic film cotton April 20 - 25. Sowing must be done no later than May 5. Density: 2800 to 3200 seedlings per mu for medium fertility cotton fields and 1800 to 2000 seedlings per mu for intercropping cotton fields. Other cotton fields are appropriately increased or decreased between 2500 and 4000 plants. Medium fertility cotton field with equal row spacing: row spacing 85 cm, large row spacing 100 - 110 cm, small row spacing 60 cm. Base fertilizer application:
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