Watermelon has a short growth period, high yield, and a large amount of fertilizer. The absorption of three elements in different growth stages of watermelon was different. Nitrogen was predominant in the early stage of growth, and potassium was the most abundant in the fruit growth stage. To this end, two links should be mastered in watermelon fertilization:
First, basal fertilizer is dominated by organic fertilizer. For every 667 square meters, about 1,000 kg of compost, compost, etc., and 30-40 kg of superphosphate and 10 kg of potassium sulfate are used.
Second, top dressing is divided into the following 4 applications:
1 Miao Fei: After the first true leaf is developed, it will be applied at a rate of 1 to 1.5 kg/urea per 667 square meters. After watering, the new high fat film will be sprayed on the surface of the plant to prevent infection by pathogens and improve natural resistance. Disaster capacity, increase the intensity of photosynthesis, protect seedlings and thrive.
2 fat vines: The stalk grows to be applied when the stipulated length is 35cm, urea 2.0kg per 667m2, superphosphate 6.7kg, potassium sulphate 0.8-1.0kg, plus spray promotion of Kaowang No. 3, can transform the vegetative growth of the plant into Reproductive nutrition, inhibition of madness of the main shoot, promotion of flower bud differentiation, and more flowering.
3 Flowering fertilizer: spraying 0.5 urea 0.3 potassium dihydrogen phosphate during flowering period, also has a good effect of increasing production. Spraying a strong guillotine can make Guateti thicker, strengthen the directional delivery of nutrients, promote the rapid development of the melon body, and make melons beautiful.
4 Swelling melon fertilizer: When the size of the fruit egg is urea 2.6kg per 667 square meters, 3-9kg of superphosphate, 5.8kg of potassium sulfate; when the fruit bowl mouth is large, urea 470kg per 667m of jade is applied. Superphosphate 3? 6kg, potassium chloride 4? 4kg. Immediately after harvesting melons, fast-approaching fertilizer was applied immediately. Urea 4-6kg per 667m2, and potassium persulphate 3-5kg were called rejuvenation fertilizer. (depending on the wind)
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