Will grapefruit fruit trees be flooded in summer when it is dry?

Summer drought grapefruit fruit trees can not be flooded, too much soil moisture will cause insufficient soil air, which will lead to root rot and fruit tree death.

Growing habits:

Pomelo trees have strong adaptability to temperature, with annual average temperature 16.6-2 1.3℃, monthly average temperature 1.4- 13.2℃, annual accumulated temperature ≥ 10℃ and absolute low temperature-65438.

The annual average temperature 18-20℃, the monthly average temperature 1 7-9℃, the annual accumulated temperature ≥ 10℃, and the absolute minimum temperature above -5℃.

When the soil temperature reaches 12- 13℃, the roots of pomelo begin to grow, and 23-30℃ is the best soil temperature for its growth and absorption of water and nutrients. Below 7℃ and above 37℃, the root growth of pomelo was weak or stopped.

The root system began to die at 45-50.5℃.

Low temperature, rainy weather or unusually high temperature during the flowering period of pomelo trees will affect flower quality, pollination and fertilization, aggravate physiological fruit drop, and lead to low fruit setting rate and low yield.

After the fruit enters the expansion stage, it is also greatly affected by temperature. When other environmental conditions are met, the temperature is suitable, the fruit expands quickly and the weight of single fruit is high. On the contrary, the fruit expansion is blocked, especially the high temperature accompanied by drought, which seriously affects the yield.

Pomelo trees have wide adaptability to soil types and soil pH, but the soil permeability is good, the soil porosity is above 10%, and the oxygen content is above 6%.

Soil hardening and excessive moisture lead to insufficient oxygen in the soil, and also produce poisonous roots such as hydrogen sulfide, nitrous acid and ferrous oxide, which make the roots rot.

The soil layer is deep and fertile, and the suitable organic matter content of the main root distribution layer is 5%, and the suitable pH is 6-6.5.

The requirement for air humidity of grapefruit is about 75%, which is suitable for the growth and development of grapefruit.

In the growing season, the suitable soil water content is 60%-80% of the field water capacity. If it is as low as 40%-50% of the field capacity, the leaves will roll, but too much soil moisture will cause insufficient soil air and affect the growth of roots.

Grapefruit is shade-tolerant in citrus, but good lighting conditions are needed to achieve high quality and high yield.

However, grapefruit should not be exposed to strong light, and diffuse light is more beneficial to the photosynthesis of grapefruit than direct light.

Seedling raising method:

Rootstock is the best, which grows fast after grafting, bears early fruit, has high yield and good fruit quality. ?

Sowing is generally carried out in the field, and a small plastic arch shed should be built to keep warm. Emerge in the same year, and germinate in the next autumn, which can be as early as 1 year.

Grafting is usually carried out from early March to early April, and the length of autumn shoot or spring shoot scion is about 15-25 cm.

In August -65438+ 10, T-type bud grafting is commonly used.

In the first ten days of March of the following year, after the bud grafting survives, it is cut off 3-5 cm away from the bud. When the spring shoots stop growing, all the grafting piles are cut off.