Q: There are dark brown spots between the veins of the old leaves of strawberries. The edges of the upper leaves gradually turn yellow and are in a scorching state.
A: It may be magnesium deficiency. Because magnesium is the main element in the formation of chlorophyll, magnesium deficiency desensitizes the veins to browning. It is recommended to top-dress 0.5 kg of water-soluble magnesium sulfate per acre per acre for 2 to 3 consecutive days, spraying once every 7 days, and at the same time reducing excessive application of potassium fertilizer.
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