Lecture 7 b Soil Water – Part 2. Source: Dept of Agriculture Bulletin 462, 1960. Water Movement Movie University of Arizona. Be prepared for exam questions from this movie!. Describe in your own words what happens to the water in the diagram below. Water. A horizon - Air Dry. Soil. Answer.
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Source: Dept of Agriculture Bulletin 462, 1960
Be prepared for exam questions from this movie!
A horizon - Air Dry
3.8-2.4=1.6 = clay
SL = 2.2-0.6 = 1.6
from table – ls = 1.2”/ft and sil = 2.5”/ft.
350 320 300
% water by vol at Field Capacity = %FC = 55%
%water by vol at Wilt Point = % WP = 30%
% FC - % WP = % AWC
55%-30% = 25% & ( % water x inch soil = inch water)
For 4 feet of soil 25% AWC means that .25 x 48 inch.
= 12 inches of water stored in 48 inches of soil.
= 12 inches of water available/ 4 feet
350 320 300
in. of soil wetted = (in. of rain) ÷[ (%water on June 1) – (Field Cap %)]
Range of % of the total AWC – from 0 to 85%