When continuous rainfall exceeds 72 hours, and after the rain is stormy, when the temperature exceeds 35-37°C, wilting occurs in the leaves of the corn, followed by the appearance of leaf dry spots. This phenomenon is called "sunburn disease." This is because during this period, corn grows faster, the stems are crisp, and the leaves are large and thin. In addition, due to continuous rainy weather, the roots are affected by water stains, the soil is poorly ventilated, and the new roots grow less, which is relatively slower than the leaf growth. After the storm and the high temperature, the transpiration of the leaves was greater than the water supply of the rhizomes, causing a "sunburning" phenomenon.
Prevention:
1, cultivating loose soil, enhance soil permeability.
2. Spray foliar fertilizer, can spray 0.1~0.2% potassium dihydrogen phosphate solution 40~50kg/mu; spray Gaomeishi, 75g/mu, water 40~40kg; or spraying Dryland fat treasure, promote Feng Bao and so on.
3. Foliar spraying photo-respiratory inhibitor - sodium bisulfite, 200 mg/kg aqueous solution, 50 kg of mu.
4, planting stains, leaf hypertrophy varieties.
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