John Deere already has the patent for this: Pat No: 10,051,787 B2
Abstract: A harvesting head yield monitor comprises two sensing elements (328, 330) respectively disposed in two adjacent row unit covers (114). A driver circuit (400) drives one of these sensing elements (328) to produce a high radio fre quency signal. The other sensing element (330) receives the signal. A signal conditioning circuit (402) receives the signal from the other sensing element. A controller (404) coupled to the signal conditioning circuit converts the received signal into a signal that indicates the crop yield of the row unit that
is disposed underneath the two adjacent row unit covers. | 
What does the precision world need next?
