Over-summer cucumber must be topdressed
Summer temperatures are high and plants grow fast. The growth period of cucumber in summer is just under the high temperature and strong light conditions. In order to make it high quality and high yield, the water and fertilizer management in the field should be strengthened.
Throughout the summer, the cucumber grows rapidly and grows quickly. In addition to applying the base fertilizer, it is necessary to replenish the topdressing fertilizer, especially by adding phosphorus and potassium fertilizers, in order to make the pod grow vigorously and prevent premature growth and premature aging. After entering the melon period, there will be more watering and rainfall, and the soil nutrients will be easily lost. Therefore, more fertilizer and groundwater should be used. The watering time should be selected in the evening or in the morning and it should not be watered at noon.
In high-temperature and dry weather, watering is performed once every 1~2 days, and topdressing urea or high-nitrogen compound fertilizer (26-0-4) 20 kg per acre during the watering interval. In case of rain or heavy rain, it is necessary to drain water and prevent flooding. After the hot and rainy days, it is necessary to timely cool the well water. In order to prolong the melon period and increase the yield, the use of potassium dihydrogen phosphate 100g/water 50kg per acre for foliar spray, spray once every 3 to 5 days, can also be foliar spray multiple compound organic fertilizer, dilution 500 times, spray 3 times.
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Vitamin A is a fat-soluble vitamin, an organic compound whose chemical formula is C20H30O. It is stable to heat, acid, and alkali, and is easily oxidized. Ultraviolet rays can promote its oxidative damage. Vitamin A includes A1 and A2, and A1 is retinol. Vitamin A2 is 3-dehydroretinol, and its physiological activity is 40% of that of vitamin A1. [1]
Vitamin A has a variety of physiological functions such as promoting growth, reproduction, maintaining normal secretion of bones, epithelial tissue, vision and mucosal epithelium, and vitamin A and its analogs have the effect of preventing precancerous lesions. Deficiency manifests as growth retardation, impaired dark adaptation and night blindness. Dry eye disease occurs due to dryness, desquamation, hyperkeratosis, and decreased secretion of lacrimal glands of epidermal and mucosal epithelial cells. In severe cases, corneal softening, perforation and blindness occur. Respiratory epithelial cells become keratinized and lose their cilia, making them less resistant to infection. The recommended intake of vitamin A (RNI) for adults in my country is 800 μg retinol activity equivalent per day for men and 700 μg retinol activity equivalent per day for women. [2] Foods rich in vitamin A include liver, egg yolk, and milk powder of poultry and livestock. Carotene can be converted into vitamin A in the mucosa of the small intestine, red-yellow and dark green vegetables. Fruits contain more carotene.
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