Strengthening Fertilizer and Water Management to prevent premature senescence of Cotton
Recently, there is a trend of premature senescence in some cotton fields, so measures must be taken as soon as possible to ensure high cotton yield.
It mainly shows that the red stem to the top of the cotton plant, the stem is hard and inelastic, the growth point of the main stem is prominent, it is difficult to extend the new fruit branches and nodes, the leaves fade, the new leaves are small, the leaves of the middle and lower parts of the cotton plant appear reddish brown spots, and the basal leaves wither; the leaf margin scorched and fell off prematurely.
The cause of premature senility (1) the weather is unfavorable. This year, cotton suffered severe drought in the early stage of growth and waterlogging in the middle stage, resulting in poor root growth and poor ability to absorb fertilizer and water. (2) improper fertilization. When nitrogen fertilizer was applied in the early stage, the vegetative growth was too prosperous, but the chemical control was not timely, resulting in excessive consumption of nutrients. In addition, insufficient input of potash fertilizer will also lead to red leaf stem blight and premature senility. (3) harm of diseases and insect pests. Fusarium wilt disease appeared for a long time this year, the seriously diseased plants had more fallen leaves, and the plant growth was weak; affected by drought, the occurrence of red spiders in some cotton fields was serious, and the growth of cotton plants was inhibited.
Prevention and response measures to improve cotton field ditch system, to achieve drainage and energy irrigation, to ensure the normal growth of cotton root system. Apply fertilizer scientifically, especially fully apply organic fertilizer and increase potash fertilizer. In order to reduce the nutrient consumption, the cotton field should be sprayed with methyl piperidine or Zhuangzhuangsu in time. Timely control of Bemisia Tabaci and other diseases and insect pests. It can also be sprayed with the mixture of potassium dihydrogen phosphate and urea.
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Growth characteristics and Fertilizer and Water Management of Cotton at Bud stage
The growth characteristics of cotton at bud stage cotton entered a period of both vegetative growth and reproductive growth from the beginning of budding, but it was still dominated by vegetative growth. The photosynthates in the bud stage are mainly transported to the vigorous growth parts of the main stem and fruit branches, and few are supplied to the buds. With the rising temperature, the growth of roots, stems, leaves, fruit branches and flower buds of cotton is obviously accelerated, plant metabolism is more and more exuberant, physiological activities are enhanced, photosynthetic productivity is high, and root growth reaches a vigorous period. The main purpose of this period of management is to grow stably and build a high yield shelf. The growth of normal cotton at bud stage.
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Remedial measures for Frost injury of Tea trees
From February 15 to 18, we investigated the freezing injury of tea trees in Zixingtang City, Pengshi City, Guocha Institute and Chenzhou Huatang Tea Farm. The investigation found that in the well-cultivated tea garden, the green leaves of the tea trees are thick, the trees are strong, and the degree of disaster is mild, and vice versa. The disaster degree of different varieties was also different, among which the early varieties Fuyun 6 and Fuding Dahao and Bai Maozao were seriously affected, while the middle and late varieties Bixiangzao, Qianye Qi, hairy crab and population varieties were less affected. On the whole, all the tea trees in the survey sites suffered frost injury, among which the disaster was more serious.
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