Scientific Chemical Control Technology of Cotton
Cotton chemical control is one of the most difficult technologies for cotton farmers to master. According to relevant departments, chemical control of cotton can affect 30% of cotton yield, but most cotton farmers are blind chemical control, so it is necessary to promote a simple and understandable cotton chemical control technology. The experience accumulated over the years is introduced as follows. The following is only the reference data of Swiss TM cotton pruning, cotton farmers should use it flexibly according to soil fertility, climate and actual growth.
7~10 days after topping (about July 25): 40 ml per mu with 15 kg of water or 100 kg of water per bottle with a motorized sprayer.
Bud stage (June 18 or so): use 5 ml per mu to 15 kg of water or use a motorized sprayer to spray 800 kg of water per bottle.
Early flowering (July 1 or so): 10 ml per mu to 15 kg of water or 400 kg of water per bottle with a mobile sprayer foliar spray.
Full bloom (July 10 or so) using 20 ml per mu of water 15 kg or with a mobile sprayer bottle of water 200 kg foliar spray.
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Remedial measures for cotton waterlogging crops
If the whole cotton plant is submerged for more than 3 days or soaked for more than 7 days, the root system will rot and turn yellow, and the top leaves will die. This kind of cotton seedlings have little possibility of survival and need to be replanted. 2-3 days after discharge, those with more than 500 surviving cotton plants per mu should be kept and intercropped with soybean, corn, sesame and other crops; those with less than 500 surviving cotton plants per mu should be replanted and changed as soon as possible. After the disaster, the root system of cotton was damaged, the main root and lateral root turned yellow, and the root tip showed water stains. "grabbing and drainage, early soil loosening, heavy fertilization, disease and insect control, late topping and diligent pruning" should be adopted.
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How to Control Cotton Corner Leaf spot
Cotton angular spot is a bacterial disease. Cotton can occur from cotyledon stage to adult stage. After the onset of the disease, dark green dots were first produced on the back of the leaves, and then the dots gradually expanded, and polygonal oily spots were formed due to the limitation of leaf veins. The bacterial liquid is yellowish brown sticky when it is wet and white in the shape of dry scab after drying. In severe cases, it can cause the leaves to dry up and fall off. If the diseased leaf is moved to the light for perspective, the disease spot is partly like oil paper. The first cause is continuous cropping, which is caused by bacteria in the soil, and the other is poor light, high humidity, high temperature and damaged branches and leaves of cotton.
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