In the absence of potassium in potassium deficiency, the plants grow slowly, the stems are weak, the leaves are dark and dull, the leaves are curled to the back, and the leaves of the lower nodes are yellowed. Symptoms usually develop from the bottom up. In severe cases, the heart leaves become pale brown, and even the burnt shape, resulting in difficulty in fruit setting, small fruit shape, reduced sugar content, and decreased quality. Remedial measures: First, use 5 to 10 kg of potassium sulfate per mu (3 to 5 kg per mu in seedling stage, 8 to 10 kg per mu after stretching) or 30 to 60 kg in grass ash; secondly, 0.4 Foliar application of %~0.5% potassium sulfate solution.
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