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Nutrient Distribution During Development of Three Market Types of Peanuts. II. B, Cu, Mn, and Zn Contents¹

The B, Cu, Mn, and Zn contents of portions of ‘Virginia 61R,’ ‘Early Runner,’ and ‘start’ peanuts (Arachis hypogea L.) were determined at various sampling dates during the 1966 growing season. The main stem of the three cultivars generally contained higher amounts of B and Mn than the hypocotyl-crown, the stemmy and leafy portions of the first and second lateral branches, or the fruit. The highest Cu contents were usually present in the fruit and hypocotyl-crown and the highest Zn contents in the fruit and main stem. Significant differences among cultivars in B, Mn, and Zn contents of similar plant portions occurred on one or more sampling dates. Similar differences were not obtained for Cu. All plant portions sampled decreased in one or more micronutrients during the growing season, except the stemmy portion of the first and second lateral branches and the fruit.

Key Words: jumbo peanuts • runner peanuts • Spanish peanuts • ground nuts • micronutrients

² Associate Professor, Department of Agronomy, Blacksburg, and Associate and Assistant Professors, Department of Agronomy, Holland 23391, respectively.

Received for publication June 6, 1968.