PHYSIOLOGY OF CITRUS TREES

– Citrus trees are large trees, with an average height of about 3-4 m when mature, with pale yellow bark, sometimes with sap flowing from the cracks of the trunk. Woody trees.

– Branches have long, sharp thorns. Leaves have gill-shaped veins, ovate leaves, 11-12 cm long, 4.5-5.5 cm wide, both ends are blunt, whole, tough, and have large petal margins. Flowers are double, even, growing in clusters of 6-10 flowers. Large, spherical fruit, thick skin, color depending on the variety.

ECOLOGICAL REQUIREMENTS

Temperature: Citrus trees (oranges, tangerines, grapefruits) can live and grow in the temperature range of 13-38oC, most suitable is 23-29oC; < 13oC the tree stops growing; < -5oC the tree will die.

Light: Citrus trees are not suitable for direct light, the most suitable light intensity for citrus is about 10,000-15,000 Lux (equivalent to light at 8am and 4-5pm in the sunny season).

Water: Citrus trees have a very high demand for water, especially during the flowering and fruit development period. On the other hand, citrus trees are also very sensitive to waterlogged conditions. During the rainy season, if the groundwater level in the soil is high and does not drain in time, the tree will have root rot, yellow leaves and die.