In addition to the climate, the variety and growth stage of corn, the severity of the corn spot has a close relationship with the amount of fertilization and fertilization time. The corn plants with insufficient fertility and weak growth have serious diseases, while the plants with sufficient fertility and vigorous growth have low incidence. Therefore, in addition to sufficient basal fertilizer at the time of sowing to improve the disease resistance of maize plants, the application of fast-acting nitrogen fertilizers is an important prevention and control measure at the onset of corn leaf spot, which has a significant effect on controlling the spread of disease. Tests have shown that 30 kg of ammonium bicarbonate or 20 kg of urea is applied at the beginning of the onset of disease. Only 1 to 3 leaves of the lower part of the corn plant are affected. However, 5 to 6 leaves of the maize plant are not affected by the fast-acting nitrogen fertilizer. high speed.
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