Moisture equivalent as a routine soil physical test to guide irrigation management
作者:
R. B. Beverly,
E. W. Tollner,
A. W. Byous,
S. M. Thain,
期刊:
Communications in Soil Science and Plant Analysis
(Taylor Available online 1994)
卷期:
Volume 25,
issue 7-8
页码: 1035-1043
ISSN:0010-3624
年代: 1994
DOI:10.1080/00103629409369096
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
Although water retention and movement in soils determine both the need for irrigation and the loss of nitrogen (N) from agricultural systems, soil physical tests are generally too time‐consuming for routine analysis by soil testing laboratories. We evaluated the potential of the Moisture Equivalent (ME) method as described by Bouyoucos for routine soil physical measurement. The method consists of saturating a sieved soil sample in a Buchner funnel, vacuum filtering the sample for 15 min while covered, then determining the gravimetric water content. On 72 soil samples run in triplicate, ME results were highly repeatable (CV values generally less than3%).In addition, ME results were linearly correlated to clay and organic matter contents (R2= 0.85) and to 33 kPa moisture content (R2= 0.85). We conclude that the ME method is sufficiently convenient to run routinely in a soil testing laboratory, and sufficiently dependable to improve precision in irrigation and N management. Interpretive criteria for applying ME results will require verification through field calibration studies.
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