How to remedy potassium and magnesium deficiency in greenhouse strawberries
I. Potassium deficiency: The symptoms of potassium deficiency in strawberries often appear first on the newly matured upper leaves. Black, brown and dried edges often appear on the leaves and then become scorched, and it also spreads toward the center between the veins of most leaves, with old leaves being severely affected. Light intensifies leaf scorch, so potassium deficiency is often confused with "sunscald"...
I. Potassium deficiency: The symptoms of potassium deficiency in strawberries often appear first on the newly matured upper leaves. Black, brown and dried edges often appear on the leaves and then become scorched, and it also spreads toward the center between the veins of most leaves, with old leaves being severely affected. Light intensifies leaf scorch, so potassium deficiency is often confused with "sunscald". The true petioles of scorched leaves often develop brown to dark brown coloration, with mild damage, and then gradually wilt. Strawberry fruits from plants with potassium deficiency are pale in color and poor in taste. Control methods: Apply sufficient organic fertilizer, and apply about 7.5 kg of potassium sulfate per mu as a top dressing; alternatively, spray the leaves with a 0.1%-0.2% potassium dihydrogen phosphate solution 2-3 times, once every 7-10 days, using 50 kg of fertilizer solution per mu each time. II. Magnesium deficiency: Initially, the edges of the upper leaves turn yellow and become brown and scorched, then the areas between the veins become chlorotic and dark brown spots appear, with some spots developing into necrotic lesions. As the scorching worsens, the stem leaves appear light green and swollen, and the scorching develops with increasing leaf age and worsening magnesium deficiency. Magnesium deficiency generally occurs when strawberries are cultivated on sandy soil or when nitrogen and potassium fertilizers are applied excessively. Control methods: Spray the leaves with a 1%-2% magnesium sulfate solution 2-3 times, once every 10 days or so, using 50 kg of fertilizer solution per mu each time.