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The Loss of Strontium⁹⁰ from Small Cultivated Watersheds¹

ABSTRACT

Soil samples were taken from the plow layer of eight small watersheds and analyzed for strontium⁹⁰. Two watersheds in permanent pasture, with no recorded loss soil, contained about 90 mc. per square mile, which is slightly higher than an estimated total deposit at the time of sampling.

The plow layer of six watersheds under cultivation was sampled by compositing soil cores taken on contours of each watershed. The Sr⁹⁰ concentration of these samples was from one-third to two-thirds of that in the permanent pastures.

The loss of Sr⁹⁰ appeared to be influenced by length of slope and cropping history. No areas of Sr⁹⁰ accumulation were found within these watersheds.

¹ Contribution from the U. S. Soils Laboratory, Soil and Water Conservation Research Division, ARS, USDA.

² Soil Scientists, Beltsville, Md.

Received for publication March 12, 1962. Accepted for publication April 24, 1962.