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Influence of Phosphorus and Nitrogen Nutrition on Uptake and Distribution of Strontium and Calcium in Oat Plants¹

ABSTRACT

The influence of phosphorus and nitrogen applications on the uptake of radioactive strontium and calcium by oats (Avena sativa L., variety ‘Stål’) was studied in pot experiments. Heavy applications of phosphorus decreased the concentrations as well as the total uptake of ⁹⁰Sr and Ca, but the ⁹⁰Sr/Ca ratio was little affected. Nitrogen additions increased the uptake of stable Ca more than that of ⁹⁰Sr so that the ⁹⁰Sr/Ca ratio based on total uptake decreased with increasing N supply.

Nitrogen application increased the total uptake of added ⁹⁰Sr and ⁴⁵Ca considerably, but the relative distribution of the two isotopes in grain and straw was affected differently. The concentration of ⁹⁰Sr in grain decreased with increasing N supply until the maximum yield was obtained. Above this level, additional N caused a parallel increase of the ⁹⁰Sr and ⁴⁵Ca concentrations. The results indicate that translocation of Sr and Ca as well as their uptake may be differentially influenced by N nutrition.

¹ Received July 7, 1970. Approved Oct. 12, 1970.

² Soil Scientist, Danish Atomic Energy Comm., Agr. Res. Dept., Research Establishment Risø, DK-4000 Roskilde, Denmark. Temporary Address: Dept. of Soil Science, N.C. State Univ., Raleigh, N.C.

³ I thank Professor W. A. Jackson for reading the manuscript and for valuable comments and suggestions. Thanks are also due to Mrs. A. Sillesen and Mr. J. D. Thomsen for their excellent technical assistance.