HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by Romney, E. M. Articles by Larson, K. H. Search for Related Content PubMed Articles by Romney, E. M. Articles by Larson, K. H. Agricola Articles by Romney, E. M. Articles by Larson, K. H.

Influence of Ca and Sr Amendments on Sr⁹⁶ Uptake by Ladino Clover Upon Prolonged Cropping¹

ABSTRACT

Prolonged cropping experiments showed that a single application of CaCO₃ in the amount recommended to produce better crop growth (2 to 5 tons an acre) continued to suppress Sr⁹⁰ uptake from an acidic soil that initially was deficient in plant-available Ca. This effect of treatment is attributable to the complementary ion influence of Ca on Sr. The cumulative amount of Sr⁹⁰ removed by 15 successive cuttings of ladino clover was 29.38, 15.71 and 11.61% of the dose from Sassafras sandy loam treated with CaCO₃ at levels of 1, 5 and 10 me. Ca per 100 g. soil (equivalent to 0.5, 2.5 and 10 tons CaCO₃ an acre, respectively). The greatest amount of the Sr⁹⁰ dose removed from the soil by a single clover cutting was 6.38% at the 1 me. Ca treatment.

A single application of Sr(NO₃)₂ amendment at levels of 0.05, 1 and 2 me. Sr per 100 g. soil (equivalent to 0.05, 1 and 2 tons Sr(NO₃)₂ an acre) initially increased plant uptake of Sr⁹⁰ from Hanford sandy loam as a result of the displacement of Sr⁹⁰ from the exchange complex by stable Sr into the soil solution where it was more readily available to the plant. This enhancing effect of low levels of Sr amendment on Sr⁹⁰ uptake became less apparent as time progressed. The carrier-dilution effect of reducing plant uptake of Sr⁹⁰ from Hanford sandy loam was achieved by applying Sr(NO₃)₂ at a level of 10 me. Sr per 100 g. soil (equivalent to 10 tons Sr(NO₃)₂ an acre).

¹ From the Department of Biophysics and Nuclear Medicine Laboratories of Nuclear Medicine and Radiation Biology, School of Medicine, University of California at Los Angeles. These studies were supported by Contract AT (04-1)-GEN-12 between the Atomic Energy Commission and the University of California. Presented before the Western Society of Soil Science, June 15, 1960, at Eugene, Oreg.

² Associate Research Soil Scientist, Principal Laboratory Technician, Associate Research Soil Scientist and Research Biophysicist, respectively.

Received for publication August 22, 1960. Accepted for publication October 20, 1960.