Location of manganese taken up in short-term absorption by oat roots

THE oats (variety Sun II) used in experiments reported here were grown on waxed nylon mesh and supplied with Hoagland and Arnon's¹ culture solution modified by the omission of manganese chloride from the micronutrients. The roots were cut off below the netting when about 3-5 cm. long. They were washed with distilled water and immersed in a large volume of M/1,000 manganese sulphate solution for 2 hr.