Modelling Moisture Loss of Onions in Storage Using Moisture Loss Information Obtained from Individually Measured Onions

Vidalia onions were grown following recommended cultural practices in 1994-1996 and they were harvested at early, optimum, or late maturity. After onions were cured for various lengths of time, a random sample of onions was marked for individual measurement. All onions were placed into either low or high humidity A/C controlled storage for up to 30 weeks. Onions were removed as they showed signs of being rotten. Initially, and every 2 weeks thereafter, weight and grade data were collected from individual onions and in bulk from other onions. There were up to 96 treatment combinations each year. Using individual onion data, simulation of the weight loss of the bulked onions was done. Although over 5,000 onions were involved, individual measurements were taken on only 1,920 onions over the 3 years. Five simulations were conducted using parameters derived from individual onion data. Results of the simulations resembled the actual weight loss trends within the specified 90% confidence range.