Cotton nutrition seedlings seedlings
Cotton seedlings often appear dead seedlings, and in case of severe weather such as continuous low temperature and rain or high temperature after rain, it is more likely to cause large dead seedlings.
Cause of death
The continuous low temperature and rainy weather after the sowing of severe weather was the main reason for the delayed emergence and death of cotton seedlings.
Diseased soil moisture, a large number of residual bacteria, low temperature, can easily cause blight and anthrax, some old seedbeds infected with more severe disease.
Fertilizer seedling cotton seedlings have less roots, slow growth, and excessive fertilization, especially if ammonium bicarbonate or unripe organic fertilizers are used, the phenomenon of burning seedlings is more serious.
The cover soil is too thin or the thickness of the cover soil is 1.5 cm. Overly thick cover soil, easy to cause rotten seeds in case of low temperature; cover soil is too thin, quick loss of water in loquat soil, cotton seedling root system is difficult to down.
Improper watering The soil surface is wet and dry. The cotton seeds are not well contacted with the bauxite. Some of them are not seedlings due to lack of water. Some of them are easy to form hanging gas seedlings, weak seedlings or dead seedlings even if they emerge. The soil moisture is too large, seedbed temperature is low, and permeability is poor, so seeds are difficult to germinate.
Seedling soil affects seedlings, low-lying land and clay ground, high groundwater level, high humidity, slow seedling emergence, and easy incidence of dead seedlings. Sand soil soil seedling temperature is difficult to control, easy to form burning seedlings.
The excessive concentration of phytotoxicity resulted in the burning of seedlings; the misuse of pesticides caused phytotoxicity; the sprayer was not washed after the application of the herbicide, and the residual herbicide caused phytotoxicity.
Preventive measures
Disinfection prevention uses a broad-spectrum fungicide to disinfect earth and cap soil. After the seedlings were wetted, copper preparations were sprayed to protect the seedlings. In the low temperature and rainy weather, we sprayed thiobacillin and other fungicides to prevent disease.
Regulate seedbed temperature and humidity after sowing before closing seedlings film insulation moisturizing, cover the grass when the temperature reaches 25 °C shade. After the seedlings are warmed, the temperature is raised to 30°C and the membranes are removed in the morning to avoid the formation of blue-green seedlings during the high temperature period at noon. In case of low temperature and rainy weather, cover the film.
It is advisable to prevent 80% of the relative moisture content of wet earthworms. Ditch around the seedbed, drainage wet. Before sowing, the seedbed should not be watered after pouring enough water to keep the soil dry and reduce the incidence of disease.
Rationally use the fertilizer to produce fertilizer and soil for the first 20 days. Apply 2 kg compound fertilizer, 4 kg of cooked cake fertilizer and 150 kg of manure water per mu of Daejeon seedbed.
Prevention of disease application concentration should not be too large. Use herbicides with caution. Sprayers must be cleaned before and after use to avoid devastating phytotoxicity.
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