|Authors: ||G. Yom Din, Z. Zugman, Y. Saks|
|Keywords: ||fruit maturity, homogeneity, postharvest, prediction, state space model|
The increased costs of packinghouse fruit handling caused by the technology of controlled atmosphere storage are expected to be compensated by the year-round marketing of fruit.
Homogeneous fruit maturity in a storage room and optimal storage duration have an effect on fruit prices.
According to the current practice of room filling, not sufficient emphasis is made on this priority.
During the harvest period several rooms are filled simultaneously with fruit of variable levels of homogeneity.
To fulfill the requirement of homogeneity a method to recommend minimum and maximum bounds of maturity parameter values for each of the considered storage rooms should be developed.
The suggested model enables presentation of the above-mentioned bounds of maturity parameters with the help of homogeneity coefficients (HC) for separate rooms.
A central vector of fruit maturity values for a storage room (a “center”) and a radius for their maximum deviation from the “center” lay in the bases of the estimation of HC. The necessary estimations have been made using fruit maturity data collected in an enterprise database, both data measured upon fruit arrival to the packinghouse, and the one predicted prior to harvest.
The validation of the model, based on data collected for 3 apple varieties during 4 years, is presented.
While in current practice the HCs values were similar in all rooms (0.65 – 0.75 depending on variety and season), the HCs estimated for homogeneous room filling (predicted data) were 0.24 – 0.27, 0.36 – 0.59, and 0.85 – 0.96 in high, average and low homogeneity rooms, respectively.
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