Water lost by plants through tiny pores, called stomata, in the plant's leaves, back into the atmosphere is called transpiration. Water lost by the soil which enters the atmosphere in a gaseous form is from a process called evaporation.
Control of water loss through transpiration is often difficult, due to the very large number of pores, and the large surface area over which they are found. It is for this reason that ways to counter evaporation from the soil have become so important.
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