Influence of Phosphorus and Nitrogen Nutrition on Uptake and Distribution of Strontium and Calcium in Oat Plants
1971
Andersen, A. J.
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.
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