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Modified-Atmosphere Effects on the Market Quality of Lettuce Shipped by Rail

Author

Listed:
  • Stewart, J. K.
  • Ceponis, M. J.
  • Beraha, L.

Abstract

Excerpts from the report: Railcars and trailers equipped for the transport of fresh produce in modified atmospheres have been available to lettuce shippers on the west coast since about 1964. Some of these modified-atmosphere systems have been tested previously by the U.S. Department of Agriculture. One such system introduces nitrogen into the load compartment during transit to refrigerate the load and also to maintain a low oxygen (O2) level. Another system previously tested introduces nitrogen (N2) into the load compartment, during transit only, to maintain a low O2 level; the load in this system is refrigerated by conventional mechanical equipment. A third system for maintaining modified atmospheres in transit was tested in 1967 and 1968 by the USDA for lettuce shipments. In this system the O2 concentration is lowered by purging the load compartment with nitrogen after the car or trailer is loaded. No additional nitrogen is introduced during transit. After the initial purge, carbon monoxide (CO) is also introduced into the car or trailer and lime is placed in the vehicles to absorb the carbon dioxide (CO2) produced by the lettuce during respiration. The vehicles are tightly sealed to reduce air leakage through doors, drains, and other openings. This report presents the results of tests conducted to determine the effectiveness of this particular system in maintaining the market quality of lettuce and to further evaluate the merits of modified atmospheres for lettuce during transcontinental shipment.

Suggested Citation

  • Stewart, J. K. & Ceponis, M. J. & Beraha, L., 1970. "Modified-Atmosphere Effects on the Market Quality of Lettuce Shipped by Rail," Marketing Research Reports 313252, United States Department of Agriculture, Agricultural Marketing Service, Transportation and Marketing Program.
    • Handle: RePEc:ags:uamsmr:313252
    DOI: 10.22004/ag.econ.313252
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