Control techniques of overgrowth of Cotton
At present, cotton has entered the budding stage, the prevention and control of cotton overgrowth must start from now on. The so-called overgrowth means that cotton loses the function of normal growth, that is, it only blossoms but does not bear peaches, or blossoms more than peaches. First of all, the reason is caused by climate factors, the second is the blind introduction of cotton varieties, and the second is that the cultivation means do not adapt to climate change.
According to records, when the temperature exceeds 35 ℃, the pollen development is abnormal and can not pollinate normally, while the persistent drought aggravates the shedding of buds and bolls. In addition, in mid-August, some cotton areas have been overcast and rainy for a week, which will also make it difficult for cotton to bloom and pollinate normally.
In terms of cultivation technology, some late-maturing cotton varieties and late-stubble cotton encountered high temperature and drought during the peak flowering period; some cotton fields had too much density, serious shade, and poor permeable environment; some cotton fields applied nitrogen fertilizer, resulting in excessive vegetative growth and bad peach setting.
The following measures can be taken to save the cotton apprentices:
First of all, seize the opportunity of the second peach peak of cotton. In normal years, the first peach peak is from early July to late July. When the temperature drops to 25: 30 ℃, there will be a second peach peak. Therefore, the loss of autumn peach can be compensated, and the mature rate of autumn peach is about 15% higher than that of Fu peach.
Secondly, strengthen management. Urea is applied to cotton fields that are defertilized, adding 10 kilograms of potash fertilizer per mu; 1% urea and 0.2% potassium dihydrogen phosphate solution are sprayed on the roots of general cotton fields; thoroughly pruning and removing old leaves in cotton fields with high density and shade weight; spraying Zhuang Su on the roots of cotton fields that are growing well, 7 million milliliters per mu and 50 kilograms of water; good control of late-stage diseases and insect pests.
Third, select the cotton varieties suitable for planting in this area.
- Prev
Causes of excessive growth of cotton and its control
The phenomenon of excessive growth of vegetative organs such as stems, branches and leaves of cotton plants, which makes vegetative growth and reproductive growth out of balance, is called overgrowth, commonly known as "crazy growth". The vegetative growth and reproductive growth of cotton are carried out synchronously after budding. If the vegetative growth is too fast and the reproductive growth is inhibited, it will cause bud and boll shedding, and in serious cases, there will be no boll formation. The reason for overgrowth: mainly due to the application of too much fertilizer and water. The period from budding to the early stage of flowering is the fastest vegetative growth period in cotton life. If the supply of nitrogen fertilizer is too much, it will result in the proportion of carbon and nitrogen metabolism.
- Next
Main diseases and insect pests of banyan bonsai
First, soot disease. Soot disease often occurs with aphids and scale insects under the condition of high temperature and humidity. The control measures are as follows: (1) to create ventilation and light transmission conditions for plants; (2) to reduce air humidity; (3) to scrub disease spots with a brush dipped in water; (4) to eliminate aphids and shell insects in time; and (5) to protect by spraying. Spray 120 ℃ 160 times Bordeaux solution or 70% methyl thiophanate 700 times 800 times solution, or 50% carbendazim wet powder 500 times 80 every 10 to 14 days from June to August.
Related
- Fuxing push coffee new agricultural production and marketing class: lack of small-scale processing plants
- Jujube rice field leisure farm deep ploughing Yilan for five years to create a space for organic food and play
- Nongyu Farm-A trial of organic papaya for brave women with advanced technology
- Four points for attention in the prevention and control of diseases and insect pests of edible fungi
- How to add nutrient solution to Edible Fungi
- Is there any good way to control edible fungus mites?
- Open Inoculation Technology of Edible Fungi
- Is there any clever way to use fertilizer for edible fungus in winter?
- What agents are used to kill the pathogens of edible fungi in the mushroom shed?
- Rapid drying of Edible Fungi