Grape skin can be eaten.
Grape skin can be eaten, the skin of grapes has a high nutritional value, but it must be washed when eating. Most of the grapes on the market have problems with pesticide residues, so be sure to wash them before eating them.
It is best to wash with water first, and then with detergents that can effectively remove pesticide components. It is not advisable to soak them in water or salt water, because water soaking is likely to promote the penetration of pesticide residues on the surface of the grapes into the flesh.
When people eat grapes, because the skin has an astringent flavor, they have to spit out the skin, which will lose a large portion of the nutrients from the skin. Nutritionists have found that grape skins are richer in resveratrol, a polyhydroxyphenolic compound, than in grape flesh and seeds.
Growing environment
Grape growth requires a minimum air temperature of about 12 ℃ -15 ℃, the lowest ground temperature of about 10 ℃ -13 ℃, the optimal temperature for the flowering period of about 20 ℃, the optimal temperature for the fruit expansion period of 20 ℃ -30 ℃. If the temperature difference between day and night is large, coloring and sugar is better.
After the spring sprouting of grapes. If the temperature rises quickly, it is easy to cause the branches to grow in futility, manifested in the section wink long not full, easy to fertilization during flowering, such as the spring cold to pay attention to more phosphorus fertilizer and high carbon organic matter, minimize nitrogen fertilizer.
Grape water requirements are high, strict control of soil moisture is a prerequisite for good grapes. Grapes in the early stages of growth or nutrient growth period when the amount of water required more, late growth or fruiting period, the roots are weaker and need less water, to avoid injuring the roots to avoid affecting the quality.
Grapes avoid rain and dew, rainy years easy to cause insufficient sunshine, photosynthesis is limited, so try to keep the branch in the flowering period 40-70 cm is ideal; easy to crack the fruit in the region of the results of the irrigation period should also be controlled. Water shortages and drought-prone areas should be appropriately covered with straw to maintain soil moisture, but also to control the growth of grass.
Reference: Baidu Encyclopedia - Grape skin