crop estimate; estimated crop yield
Used in agricultural, economic, and statistical contexts to refer to the projected harvest amount.
This year's estimated rice yield is expected to exceed the average.
The Ministry of Agriculture, Forestry and Fisheries announced the crop estimate.
収穫高 means 'crop yield' or 'harvest amount', while 予想収穫高 specifically refers to the estimated or projected yield before the actual harvest.
Compound of 予想 (よそう, 'expectation, forecast') + 収穫高 (しゅうかくだか, 'crop yield'). The term is a straightforward combination of its parts.