Influence of Phosphorus and Nitrogen Nutrition on Uptake and Distribution of Strontium and Calcium in Oat Plants1
- A. J. Andersen2,3
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.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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