The purpose of the four seasons' study of maturity indexes of Elberta type peaches, made in Utah during the years 1926, 1928, 1929, and 1932 and presented in this publication, was to determine more accurately the best stage of maturity of peaches for distant shipment. In general, the procedure was: (1) To record color, pressure test, and other maturity indexes of fruit from trees under various conditions of culture, age, and vigor; (2) to classify the fruit by size and ground color; (3) to store under conditions comparable to refrigerated shipment to market; and (4) to record the appearance, quality, and condition of fruit when withdrawn from storage. Elberta, Early Elberta, and J. H. Hale varieties were investigated. In 1932, maturity indexes were studied in their relation to pruning methods, precooling, and chemical content of fruit.
Coe, F. M., "Bulletin No. 241 - Peach Harvesting Studies" (1933). UAES Bulletins. Paper 200.