英语作文苹果四季变化

Apple is one of the most common fruits. Apple tree belongs to the Rosaceae, deciduous tree, oval leaves with serrated. The fruit is spherical, sweet, crisp taste and rich rich in nutrients, is the world's four major fruits of the crown. Apple usually red, but there are yellow and green. Apple is a low-calorie foods, per 100 grams produced only 60 kcal. Apple soluble nutrients in the large, easily absorbed, it is living water, said its favor dissolved sulfur, lubricate the skin soft
Apple hi low-temperature drying of temperate fruit trees require winter cold, summer heat. Suitable temperature range of the average annual temperature is 9 ~ 14 ℃, extreme winter low temperature is not lower than -12 ℃, the highest monthly average temperature in summer is not higher than 20 ℃, ≥10 ℃ accumulated temperature about 5000 ℃, growing season (April to October ) the average temperature of 12 ~ 18 ℃, 7.2 ℃ cold winter need the following from 1200 to 1500 hours in order to successfully through natural dormancy. It is generally believed that the mean annual temperature in the region of 7.5 ~ 14 ℃, can be cultivated apple. Apple's long dormancy period. As winter temperatures are high, can not meet the required cold winter dormant period when spring germination missing.
From the world's most cultivated apple region, the coldest month in winter (in the northern hemisphere in January, the Southern Hemisphere in July) the average temperature between -10 ~ 10 ℃, in order to meet Apple's low temperature requirements. Each major apple producing areas of China in January the average temperature is within this limit. Growing season (April to October) the average temperature in the 12 ~ 18 ℃, the summer (June to August) the average temperature is 18 ~ 24 ℃, the most suitable for growing apples. Fall temperatures low during the day and at night when the high fruit sugar at high, good color, thick skin, more fruit powder, storable