One, potassium deficiency: The symptoms of potassium deficiency in strawberries often occur in newly mature upper leaves. Leaf edges often appear black, brown and dry, followed by burns. They also develop towards the center between the veins of most of the leaves. Old leaves suffer severe damage. Illumination will increase leaf burns, so the lack of potassium is often confused with "sunburn." The petiole of the burned leaf often develops brown to dark brown, with mild damage, and gradually wither. The potassium-deficient strawberry has a light color and poor taste. Control methods: Apply sufficient organic fertilizer, apply about 7.5 kg of potassium sulfate per acre; also spray the solution of potassium dihydrogen phosphate 0.1%~0.2% 2~3 times, spray once every 7~10 days. Spray fertilizer 50 kg per mu. Second, magnesium deficiency: the upper edge of the initial yellow leaves and browning coke, and then chlorosis between dark veins and dark brown spots, some spots develop necrotic spots. When scorch is aggravated, the stem leaves appear pale green and swell, and the coking phenomenon develops with the increase of leaf age and the increase of magnesium deficiency. Generally, magnesium deficiency disease is easy to occur when strawberries are cultivated in sandy soil or nitrogen fertilizer and potassium fertilizer are used excessively. Control methods: Foliar spraying 1%~2% magnesium sulfate solution 2~3 times, spray once every 10 days, spray fertilizer liquid per acre 50 kilograms.
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