Transcription of Methods of Measuring
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Methods of Measuring
Methods of Measuring soil moisture in the FieldBy A. I. JOHNSONCONTRIBUTIONS TO THE HYDROLOGY OF THE UNITED STATES GEOLOGICAL SURVEY WATER-SUPPLY PAPER 1619-UEvaluates Methods for Measuring soil moisture and describes the equipment usedUNITED STATES GOVERNMENT PRINTING OFFICE, WASHINGTON : DEPARTMENT OF THE INTERIOR MANUEL LUJAN, Jr., GEOLOGICAL SURVEY Dallas L. Peck, DirectorFirst printing 1962 Second printing 1963 Third printing 1992 Any use of trade, product, or firm names in this publication is for descriptive purposes only and does not imply endorsement by the Gover nmentFor sale by the Books and Open-File Reports Section Geological Survey, Federal Center, Box 25425, Denver, CO 80225 CONTENTS Page Abstract__ _ _____ 2 Gravimetric __ _____ 2 Sample 2 Sampling augers_____ 3 Sampling tubes or core barrels_____ 4 Porter piston 4 Pomona open-drive 5 Johnson open-drive 5 Electrical-resistance.
with a rubber hammer. SAMPLING TUBES OR CORE BARRELS A soil-sampling tube, core barrel, or drive sampler of some type offers an advantage in soil-moisture sampling because volumetric sam ples can be obtained for calculating moisture content by volume. The King tube was developed in 1890, and Veihmeyer developed modified soil tubes in 1929.
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