Effects of air gaps and saturated voids on accuracy of neutron moisture measurements effectsofairgaps120rich Year: 1972 JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC DATE Figure 12. — Seasonal soil moisture for a given depth. 0 5 10 15 20 25 30 35 40 45 50 55 60 0 +5 +10 +15 +20 PERCENT MOISTURE BY VOLUME ERROR - MOISTURE Figure 13. — Field data curve showing measiuement error caused by a void partly filled with water. 17

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