Declining yields in oranges: Appraisal of 220 mature orange orchards in five counties indicates possible causes of downward trend in production
Paul W. Moore, University of California
Edward Nauer, University of California
California Agriculture 11(1):13-14. DOI: 10.3733/ca.v011n01p13.
Paul W. Moore is Specialist in Citrus Grove Rejuvenation Research, University of California, Riverside. Edward Nauer is Assistant Specialist in Horticulture, University of California, Riverside.
Abstract Not Available – First paragraph follows:
Average production of southern California oranges dropped from 370 to 265 field boxes per acre—for navels—and from 290 to 265 field boxes per acre—for Valencias—over a 12-year period. Many individual orchards in Los Angeles, San Bernardino, and Orange counties—the three areas most seriously affected—showed a production decline of as much as 100 to 250 field boxes per acre during the same period.