The effect of temperature on grape growth, what is the growing temperature of grapes?

Temperature is an important factor in the growth and development of grapes. Grapes are temperate plants and have high heat requirements. However, different stages of development have different requirements for temperature.

When the temperature rises above 10 degrees Celsius, European varieties begin to sprout first. The optimum temperature for new shoots to grow is 25 to 30 degrees Celsius; The optimum temperature for flowering is 20 to 28 degrees Celsius, with slight variations between varieties, with nighttime lows of not less than 14 degrees Celsius, otherwise pollination and fertilization will be poor. Berries grow at no less than 20 degrees Celsius and below 20 degrees Celsius, berries grow slowly and ripe late.

The ripening period of the fruit is 25 to 30 degrees Celsius, when it is lower than 14 degrees Celsius, it can not ripen normally, and the temperature difference between day and night during the ripening period should be greater than 10 degrees Celsius, which is conducive to the accumulation of sugar and the improvement of quality. Temperatures above 40 degrees Celsius during the growing season can be harmful to the grapes. At temperatures below -5 degrees Celsius, the roots will be frozen.

The growth and development of grapes is also affected by active accumulated temperatures above 10 degrees Celsius. Varieties at different maturity stages have different requirements for active accumulated temperature. Under open field conditions, due to the low active accumulated temperature in cold areas, late-maturing and very late-maturing varieties could not mature normally, and only early-maturing and medium-maturing varieties could be planted.

This restriction is exempt under greenhouse conditions.

Grape from the beginning of the temperature to the bud germination requirements of the effective accumulated temperature of 450 -500, the general heating greenhouse from the beginning of December to start the temperature, the non-heating solar greenhouse from the beginning of January began to open the curtain to heat up, after 30 40 days of heating exercise grapes began to sprout.

The indoor temperature rises too fast and too high, and the temperature is suitable for grape bud eye germination, while the ground temperature rises slowly, which often leads to uncoordinated growth between the ground and the underground, untidy germination, and poor flower spike gestation. Therefore, in the first week of the curtain rise, the indoor temperature should be kept at about 20 during the day, 10 -15 at night, and gradually increased to 25-27 during the day, and the maximum temperature should not exceed 30, and it should be kept at 15-18 at night. The humidity requirements are higher at this stage, and the air humidity should be about 90%.

When the temperature rises, it is about 20 degrees during the day, 10-15 at night, 28-30 degrees during the day and 15-20 degrees at night in the germination period, and 25-30 degrees during the day during the growth period, and 15 degrees at night is conducive to the differentiation of flower buds. The berry season is 28-30 degrees during the day and 20 degrees for the night moon. When the temperature exceeds 35 degrees, pay attention to the ventilation to cool down.

1. Germination stage: buds begin to germinate above 10, and buds germinating below -3 begin to be frozen; 15 20 Sprouts neatly and quickly.

2. New shoot growth period: new shoots begin to grow above 10 in spring, and sell back at -1 o'clock to wait for young shoots and young leaves to begin to freeze; Autumn 10 below the growth stopped, 25 30 rapid growth; Above 35, the growth is stagnant, and above 40 for a long time, the new shoots wither and rise, and the leaves turn yellow and fall off.

3. Flowering and fruit setting period: more than 15 flowers, less than 0 flowers are frozen to death, and young fruits are frozen and fall off. 25 30 Rapid flowering, high pollination and fertilization rate, easy fruit setting. More than 35 pollination is blocked.

4. Berry ripening period; -3 Berries are frozen or cause physiological fruit drop; 28 32 during the day and 10 20 at night, the berries ripen quickly, have good coloring, strong flavor and excellent quality. Above 35 are prone to sunburn, increased respiratory intensity, disturbed enzyme activity, and decreased berry quality.

5. Defoliation period: 0 lower leaves are frozen and die; 3 5 Normal defoliation.

6. Dormant period: 0 7 is conducive to passing the dormant period, and the next spring germinates neatly. More than 15 is not conducive to passing the dormant period, delayed germination, and germination is not neat.

Grape growth characteristics.

Grapes are highly protected from light, making them suitable for planting in areas with low precipitation and deep soils. They are hardy, prefer certain low temperatures in winter, and grow better in well-drained fertile sandy loam soils. The main grape producing areas in China are mainly concentrated in Xinjiang, Shaanxi, Yunnan, Hesanshounan and other places.

Grape growing temperature.

Grape roots are suitable for activity at 7-10 degrees, the average temperature is best maintained at 10-12 degrees, the best time for shoot growth and flower bud differentiation is 25-30 degrees, and berry ripening is at 28-32 degrees. Talk.

Are grapes resistant to high temperatures.

Grapes are resistant to high temperatures, but when the temperature rises to 35, the growth of the grapes stops, and when the temperature exceeds 40, it is prone to burns.

What is the minimum hardiness of the grapes.

The cold hardiness of different grape varieties varies greatly. Generally, European grape varieties have the worst cold resistance, and the roots are frozen at -4, such as rose, vineyard queen, etc. European and American hybrids are slightly more resistant to cold than European varieties, with roots frozen at -6 -8.

What temperature can grapes be planted.

The best time to plant grapes is from February to March in spring or October to November in autumn, when the temperature is suitable to improve the survival rate of the grapes. Font grapes grow according to the season. Spring temperatures rise and bud break in March and the leaves begin to turn green.

The grapes will flower in May, bear fruit in July, and then ripen in mid-August.

Grape growing process.

Grapes should be planted in sunny, higher ground, loose soil, and well-ventilated areas. When planting, it is necessary to grasp the row spacing and plant spacing, and strengthen ventilation. Pay attention to water and fertilizer management, do not water too frequently, so as not to aggravate the diseases in the garden, apply fertilizer reasonably, and increase the proportion of phosphorus and potassium fertilizer.