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Plant, Water Relations of

Jensen, Marvin E. (1971) Plant, Water Relations of. In: McGraw-Hill Yearbook of Science & Technology - 1971. pp. 328-329.

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Under field conditions and similar climates, the
daily amount of water evaporated by agricultural
plants is nearly the same for most agricultural
crops at full cover when soil moisture is not limiting.
The amount of energy available to evaporate
water is the major controlling factor when actively
growing, well-watered agricultural plants fully
cover the soil. As a result, mean maximum evaporation
rates generally vary between 5 and 6 mm
per day in humid moderate climates and between
7.5 and 8.5 mm per day in arid irrigated areas. Daily
rates of 10-14 mm have been measured on
clear, hot, windy days. The total seasonal amount
of water evaporated from an annual crop ranges
from 50 to 80% of the amount evaporated from a
crop such as alfalfa in a given climate. Small
plants that do not shade the soil after planting and
mature plants near harvest account for most of this
difference. Total seasonal evaporation also depends
on the length of the growing season.

Item Type: Book Section
NWISRL Publication Number: 0198
Subjects: Mass Import - unclassified
Depositing User: Dan Stieneke
Date Deposited: 20 Nov 2010 21:54
Last Modified: 24 Feb 2017 21:23
Item ID: 744