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Agriculture | n. phr.
olives that are harvested off the ground after wind, plagues or  ripeness have naturally caused them to fall. Fallen olives become damaged and deteriorate through contact with the s oil so that they  yield lower  quality oil than  tree-harvested olives.

Example

The quality of the oil made with fallen olives deteriorates. Therefore, from this point of view it is not convenient to delay the collection in time, moving away from the optimal collection moment.

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