Comparative Effects of Ammonium or Sodium Added to Substrates Low in Calcium, on the Distribution of 45ca in Subterranean Clover

Abstract

Ca was used in order to study the relative effects of adding either N a + or NHt to nutrient solutions which were either very deficient (Cal) or deficient (Ca2) in calcium on the distribution of calcium in subterranean clover grown therein. "Ca was added to the solutions at the commencement of the experiment, and plants were harvested 20, 30, and 40 days later. The distribution of ,sCa was studied by means of radioautographs and radioassays of selected tissues.