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Soil Water Measurement with an Inexpensive Spectrophotometer
Author(s) -
Bowers S. A.,
Smith S. J.,
Fisher H. D.,
Miller G. E.
Publication year - 1975
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1975.03615995003900030014x
Subject(s) - soil water , absorbance , curvilinear coordinates , environmental science , soil test , soil science , chemistry , environmental chemistry , mathematics , chromatography , geometry
A small, portable, battery‐powered, spectrophotometer was developed to measure soil water content rapidly. Soil water contents of 16 soils were related to the absorbance at 1.94 µm by a soil‐methanol extract by the curvilinear equation Absorbance = K [ % soil water 100 + 1.025 ( % soil water ) ] + a .With the exception of Houston Black Clay, one equation could be used for all soils. Determination time for individual samples was approximately 15 min.