1. A system for estimating a crop characteristic, said system comprising: a database containing plant growth models for a plurality of fields; a plant growth model correlator, implemented by a processor, communicatively coupled with said database and configured for determining at least one harvested field with a first plant growth model which correlates with a second plant growth model for at least a portion of an unharvested field; and a crop characteristic estimator, implemented by said processor, configured for estimating a crop characteristic for said unharvested field based on actual crop characteristic data obtained from said at least one harvested field.