1, temperature:

Apple tree is a dry temperate tree. The suitable annual temperature range is about 10- 15 degrees. The average temperature in winter should not be lower than minus 18 degrees, and the highest temperature in summer should not be higher than 25 degrees. The average temperature of apples in April-June is about 18-20 degrees.

Generally, it is suitable for planting apples in areas where the annual average temperature is 10- 15 degrees. Apple trees have a long dormant period. If the temperature in winter is too high to meet the hibernation requirements of apple trees, fruit trees will germinate unevenly in spring.

2. Rainfall:

During the growing period, the normal rainfall of apples per mu is about 200 mm. Under natural conditions, fruit trees generally absorb about 1/4 of rainfall, and normal apples use 540mm of water every year. If the rainfall is insufficient from April to September, it is necessary to water it artificially. Pay attention to drainage in rainy months.

The annual precipitation in the main apple producing areas in the world is about 500 mm -800 mm, and dry air and sufficient sunshine are needed for flower bud differentiation and fruit ripening, so the fruit surface is smooth, colorful and full of flower buds. If there is too much rainfall and insufficient sunshine, it will easily lead to too many branches and leaves, poor flower bud differentiation, low and unstable yield, serious pests and diseases and poor fruit quality.

3. Lighting:

Apple is a tree species that avoids light. Adequate illumination is beneficial to the normal growth and fruiting of fruits, and also to improving the quality of fruits. Different varieties have different requirements for light. The annual sunshine hours in Huaibei area are more than 2000 hours, which can basically meet the needs of apple growth and development.

According to scientific data, the illumination of apples should reach 700-900 meter candles, and apples need 4000-5000 meter candles when they are ripe. Every time the required light can be achieved, the branches and leaves of apple trees will weaken, the pests of fruit trees will increase, the flowering rate of fruit trees will be low, the fruit setting rate will be reduced, and the roots of fruit trees will also be affected to some extent, resulting in low nutrient transport, poor fruit color and lack of luster.

4. Soil:

Soil also has a great influence on apples. As long as the land where fruit trees are planted requires good ventilation, they should not be planted in sandy soil and saline-alkali land, but should be planted in soil with fertile land, good drainage capacity and strong acidity.

Apple is suitable for sandy loam with deep soil layer, good drainage and rich organic matter. The PH value of soil should be slightly acidic to neutral. When the soil is poorly ventilated, the growth of roots is hindered. When the pH value is above PH7.8, it is easy to be undernourished and lose its green color. The salt tolerance of soil is lower than 0. 15%.

Extended data:

First, the efficacy and role of apples

(1), reducing cholesterol.

Keeping blood sugar stable can also effectively lower cholesterol.

(2) Anti-cancer

Reduce the risk of lung cancer and prevent lead poisoning. Procyanidins can prevent colon cancer.

(3), vascular cleaning agent

Improve respiratory system and lung function, and protect lungs from pollution and smoke.

(4) promoting gastrointestinal peristalsis

Assist the human body to discharge waste smoothly and reduce the harm of harmful substances to the skin.

(5) Maintain acid-base balance

Apples are alkaline foods. Eating apples can quickly neutralize excessive acidic substances in the body (including acid produced by exercise (sports food) and acidic metabolites produced by acidic foods such as fish, meat and eggs in the body), and enhance physical strength and disease resistance.

Second, the selection method of apples

(1), see if the apple handle has concentric circles, because it is sunny, so it is sweet.

(2) See if there are any stripes on the apple, the more the better.

(3) The redder the apple, the brighter it is.

References:

Baidu Encyclopedia-Apple