What is the reason why tomatoes are white and green? Why don't gray fruits grow up?

It is because the temperature in the shed is low (about 8℃), the plant growth is not robust and the nutrient supply is insufficient. It is suggested that the greenhouse temperature should be raised to 15℃ ~ 18℃, the leaves should be sprayed with Bihu and potassium dihydrogen phosphate to supplement trace elements such as calcium, magnesium and boron, and 50 grams of brown sugar and vinegar 100 grams per mu should be sprayed to improve the plant resistance, with an interval of about one week.