In iron deficiency watermelons, iron deficiency first expresses symptoms on the top leaves of the plants. In the early stage or when the iron deficiency was not severe, the top new leaf was chlorotic, pale green or pale yellow, and veins remained green. With the delay of time, due to severe iron deficiency, the veins will fade or disappear. The entire leaf is yellow or yellow-white. Remedy: Spray sulphate 500-1000 times on leaves.
Manganese deficiency Mn deficiency in watermelon, yellow veins between the tender veins, the main vein is still green, and then developed to just mature large leaves, seed development is not complete, easy to form deformed fruit. Remedial measures: Manganese deficiency was found and promptly sprayed with 0.05%-0.1% manganese sulfate solution.
Zinc deficiency When watermelon lacks zinc, the branches are slender, the internodes are short, the leaves are stunted, the leaves are clustered or rosette-like, and they roll over the leaves and the leaves and leaf edges turn brown and gradually dry. Remedy: EDTA-Zn fertilizer can be sprayed on the leaf surface, generally diluted 2000-3000 times.
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