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Water Relations

Water is the most abundant constituent of all physiologically active plant cells, ranging between 55-85% of the water content of leaves. Water is an important parameter for plant growth or yield representing a complex hydrodynamic system, which involves absorption of water from the soil, water translocation throughout the plant and, its loss to the environment - transpiration. The capacity of plants to meet the demand and thus to avoid water deficit depends on this hydrodynamic system. Since water relations of a plant are closely related and affected by the environment we need to closely monitor at least:

- soil properties in particular the water content which determines the water that is potentially available for transpiration,

- air humidity and temperature around the leaves as the two major factors which affect the evaporation of water into the air.

Further reading:

Nobel PS (2005) Physicochemical and environmental plant physiology. Elsevier Academic Press, Amsterdam.