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Incremental Soil Sampler for Use in Summer-Fallowed Soils¹

ABSTRACT

An inexpensive, manually operated soil sampler has been developed for determining profiles of bulk density and water content in the top 10 cm of rod-weeded summer-fallowed soil. This sampler is especially suitable for sampling 1-cm increments of loose dry soil overlying a firm soil at a 10- to 20-cm depth. Field data obtained with this sampler showed true variations in soil moisture and bulk density with respect to depth and time even at depths of < 2 cm. Thus it is possible to estimate soil heat capacity over the whole 0- to 40-cm profile.

¹ Contribution of the Science and Education Administration, Agricultural Research, USDA, in cooperation with the Agricultural Experiment Station, Oregon State Univ. Technical Journal Series no. 4885.

² Soil Scientists and Physical Science Technician, respectively, located at the Columbia Plateau Conserv. Res. Ctr., SEA-AR, Pendleton, OR 97801.

Received for publication October 2, 1978. Accepted for publication December 12, 1978.

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