There are several excellent guides on best post-harvest handling practices for organically produced fruits and vegetables available on the web. Some of our picks include:

Publisher Related websites or documents
North Carolina State University Guide to Postharvest Handling and Cooling of   Fresh Fruits, Vegetables, and Flowers for Small Farms:
Part I: Quality Maintenance
Part II: CoolingPart III: Handling,Part IV: Mixed LoadsPackaging Requirements For Fresh Fruits and   Vegetables
ATTRA: Appropriate Technology Transfer for   Rural Areas Organic Farming and Post-Harvest Handling of Fruits and Vegetables
University of California Post-Harvest Handling for Organic Crops
Center for Environmental Farming Systems Resources for Small Farm Post-Harvest Handling