pnut pnut Peanut Science 0095-3679 0095-3679 American Peanut Research and Education Society 10.3146/i0095-3679-3-1-8 Articles Evaluation of the Arginine Maturity Index (AMI) Method of Maturity Estimation for Virginia Type Peanuts1 B. R. Johnson 2, R. W. Mozingo 3, and C. T. Young 4 Assistant Professor of Food Science, North Carolina State University, Raleigh, N. C. 27607 Assistant Professor of Tidewater Research and Continuing Education Center, VPI & SU, Suffolk, Virginia 23437 Associate Professor of Food Science, University of Georgia, Georgia Station, Experiment, Georgia 30212

1Paper Number 4776 of the Journal Series of the North Carolina Agricultural Experiment Station, Raleigh, N. C. 27607.

Use of trade names in this publication does not imply endorsement by the North Carolina Agricultural Experiment Station of products named nor criticism of similar ones not mentioned.

 1 1976 1 1976 3 1 32 36 American Peanut Research and Education Society 1976 American Peanut Research and Education Society Abstract

The arginine maturity index (AMI) method of predicting maturity in peanuts was evaluated on Virginia type peanuts grown in the North Carolina-Virginia area. Analyses of data from a two year study showed statistical differences (P > .05) of AMI values for cultivars, location and digging dates. Official grade factors suggested maturity levels consistent with AMI maturity predictions. Maximum yields per acre were observed near minimum AMI values. Optimum yields and dollars per acre were observed primarily at AMI values of 100. However, no sufficiently definitive value was determined to be the recommended point for digging peanuts.

The AMI method was tested on commercial grades of shelled peanuts. Significant differences (P > .05) between AMI values of cultivars were also observed.