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2, deficiency of phosphorus. Phosphorus-deficient plants have poor root development, small plants, purple flowers on the back of the leaves, late flowering, and easy to fall flowers and "melons". Remedial measures: First, use 15-30 kg of calcium phosphate to open the ditch and top dressing; second, spray 0.4-0.5% superphosphate leaching solution on the foliar surface.
  3, lack of potassium. The potassium-deficient plants grow slowly, the stems are weak, the leaves are wrinkled, the edges of the old leaves become brown and die, and gradually expand inward. In severe cases, they develop to the heart leaves, and even the leaves are scorched; the fruit setting rate is very low. The melon that has been sitting is also small and the sugar content is not high. Remedial measures: First, use 5-10 kg of potassium sulfate per mu (3-5 kg ​​per mu in seedling stage, 8-10 kg per acre after stretching) or 30-60 kg of grass ash to bury the trench; .4-0.5% potassium sulfate solution foliar application.
î—¥ î—¥ 4, calcium deficiency. When calcium is deficient, the leaves are yellow and dry, and the leaves are curled to the outside, which is parachute-like. The top part of the plant turns brown and dies, and the stems stop growing. Remedy: First, increase the application of gypsum powder or calcium-containing fertilizer, such as superphosphate; second, spray with 0.2-0.4% calcium chloride solution.
î—¥ î—¥ 5, magnesium deficiency. In the absence of magnesium, the veins near the main vein of the leaf first yellow, and then gradually expand to the surrounding, making the whole leaf yellow. Prevention and remedial measures: First, apply 3.5-7 kg of boron-magnesium fertilizer per mu as base fertilizer; second, find magnesium deficiency, and spray it with 0.1% magnesium sulfate solution in time.
î—¥ î—¥ 6, boron deficiency. In the absence of boron, the new vines become shorter, the vines are upright, the new leaves become smaller, the leaves are uneven, and the uneven spots of leaves are sometimes misdiagnosed as viral diseases, resulting in a reduction in production due to lack of symptomatic treatment. Prevention and remedial measures: First, apply 0.5-1 kg of borax per mu (mixed with appropriate amount of nitrogen and phosphate fertilizer) as base fertilizer; secondly, use 0.1-0.2% borax solution leaf surface in time. Spray.
7, manganese deficiency. In the absence of manganese, the veins of the young leaves are yellowed, the main veins are still green, and then the newly developed large leaves are developed, and the seeds are underdeveloped, which is easy to form deformed fruits. Prevention and remedial measures: First, apply 1-4 kg of manganese sulfate per mu to the base fertilizer; secondly, soak seeds with 0.05-0.1% manganese sulfate solution for 12 hours at the time of sowing, or mix 4 kg per kg of melon seeds. -8 grams of manganese sulfate as a seed fertilizer; the third is to find the lack of manganese in time with 0.05-0.1% manganese sulfate solution foliar application.
(Wei Li)
Source of information: Sichuan Rural Daily
Watermelon deficiency syndrome and remedies
1. Nitrogen deficiency. The nitrogen-deficient plants grow slowly, the stems and leaves are weak, the lower leaves are green and light, the stems and shoots are shortened, and the young melons grow slowly. Remedial measures: 10-15 kg of urea per acre (about 20 grams per plant in seedling stage, 9-15 kilograms per acre in the vine season; about 15 kilograms per acre in the melon period) or 400-500 kilograms in human excrement Shi.
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