Which of the following could be of NO value to increase crop yields? The use of a GPS receiver

* Hướng dẫn giải

C

Thông tin:

- a farmer out in the field would use a GPS receiver mounted on his vehicle to pinpoint his position. (đầu đoạn 2, = A. The use of a GPS receiver)

- A computer linked to the receiver and programmed with the field’s soil conditions (=B. Testing soil samples)

- how much pesticide and fertilizer to use at that specific site. (The excessive use of chemicals)

Chỉ có C. Fixing a sensor to alarm machinery là không được nhắc đến