What medicine does cotton red leaf use?
Control up and down, enhance the stress resistance of cotton plants: one is to apply plant growth retardant acetaminophen or Zhuangzhuangsu to control cotton growth, spraying 50 kg of water with 2: 3 grams of meth or 8: 12 milliliters per mu; second, timely ploughing and ventilation in soil-hardened cotton fields to enhance permeability; third, for low-lying cotton fields, pay attention to dredging grooves at any time to promote cotton roots. Fourth, for the cotton fields cultivated with plastic film mulching, the plastic film should be removed immediately to make the cotton root develop in depth.
To increase the application of potassium fertilizer and improve the efficiency of fertilization, for the two kinds of cotton fields with potential potassium deficiency or less potassium application, the amount of potassium fertilizer should be increased by 10 kg / mu. First, it can meet the needs of potash fertilizer for cotton; second, it can adjust the proportion structure of fertilizer in cotton field and improve the utilization rate of nitrogen and phosphorus fertilizer.
Spraying fertilizer outside the root to improve the environment of oxygen supply and fertilizer absorption of the root system has caused red leaf stem blight, as long as the cotton leaves have not withered, the growth point of the main stem is still active, and extra-root topdressing can be used to quickly restore the growth function. One is to use 100 ml of humic acid active liquid fertilizer Nongshibao per mu and spray 45 kg of water; the other is to choose 0.2% potassium dihydrogen phosphate solution mixed with fungicides such as Maoling, which is used to control spot disease.
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Cotton anaphase management
In autumn, the growth of cotton turned to the late growth stage of opening bolls and completing the development of autumn peach. This period takes root and leaf protection as the center, with scientific management means to promote the healthy growth of cotton plants, prevent premature senility and greed for late ripening and rotten peaches, and strive for a bumper cotton harvest. The specific management methods are as follows. 1. After resisting drought and waterlogging the Beginning of Autumn, the drought is often serious. During the period from mid-August to mid-September, the soil water content of 040 cm should be kept at more than 55% of the field capacity. Only under sufficient moisture conditions, cotton.
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Cotton Red Leaf Stem Blight and its Control measures
First, after the disease of the symptom recognition plant, the leaves become dark green and thicker and brittle, then there are red dots scattered on the leaves, and finally the whole leaves turn red, and the leaf veins remain green, that is, red leaf stem blight. When the disease is serious, the petiole base becomes soft, dehydration shrinks, causing the leaf to wither and fall off, and the top of the stem is dry-scorched. At the same time, it is easy to cause repeated infection of ring spot and brown spot, causing the diseased plant to scorch and die. Some plants can still sprout after falling off their diseased leaves. The plants with severe and early disease were short, the root system was underdeveloped, and the main root and lateral root were both.
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