high-yield crop yields Crop yields crop yield crop yields 英語版 crop yield yield crop yield English crop yields a plant's yield W crop yield English crop yields crop yield crop yield Crop yields yield Crop yield crop yields English crop yields yield yield English crop growth or yield productions crop production crop yields crop yields yield English crop yield crop yields English crop yields Crop yields Crop yields crop production a plant's yield crop yield crop yield crop yields W W http://en.wikipedia.org/wiki/Crop_yield https://en.wikipedia.org/wiki/Crop_yield yield