One is to increase the humidity inside the shed. At night, the greenhouse sheds and air vents have been closed, the shed temperature is lowered, the humidity in the shed is gradually increased, and fog can be formed. The relative humidity is over 100%, and it can be gathered into dew on the cucumber leaves. If watering is carried out at night, it can be described as "adding frost", which can increase the humidity in the shed and easily form a low-temperature and high-humidity shed environment, which is conducive to the occurrence and spread of diseases. For example, the optimum temperature for cucumber downy mildew is about 18 °C, and the humidity is above 83%.
The second is watering at night, easy to root, and roots. Because the metabolism of cucumber roots is slow at night and the resistance to stress is poor, if the cold water is suddenly poured, it will have a greater impact on plant growth.
Under normal circumstances, watering in winter is better than watering before 10 am on sunny days.
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Whitening And Clearing Speckles Raw Materials
Whitening ingredients can be divided into the following categories:
1. Inhibit tyrosinase raw materials: the main function of this kind of raw materials is to inhibit the activity of tyrosinase in the skin and prevent the formation of melanin, so as to achieve the effect of whitening and spot removal. Commonly, there are vitamin C, tyrosinase inhibitors.2. Promote the renewal of the stratum corneum raw materials: these raw materials can promote the metabolism of the stratum corneum of the skin surface, remove the surface of the pigmentation spots, so that the skin becomes smooth and delicate. Common fruit acids, salicylic acid, etc..
3. Antioxidant raw materials: these raw materials can resist the attack of free radicals, prevent the formation of melanin, protect the skin from oxidative damage, so as to achieve the effect of whitening spots. Commonly, there are vitamin E, green tea extract and so on.
4. Raw materials to block melanin transmission: these raw materials can prevent melanin from basal layer to surface layer transmission, thus reducing pigmentation and achieving the effect of whitening and eliminating spots. The common ones are aloe vera extract and peony extract.
5. Skin repairing raw materials: these raw materials mainly help to repair damaged skin and promote the skin's self-repairing ability, so as to reduce the formation of pigmentation. Common hyaluronic acid, collagen and so on.
6. sunscreen raw materials: these raw materials can block ultraviolet damage to the skin, to prevent the formation of melanin, to achieve the effect of whitening spots. Commonly, there are titanium dioxide, zinc oxide and so on.
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