The net profit increased per Mou by employing 6 sprays of Dithane (1:800) was 22.3 Yuen, while that by 2 sprays of copper stearate and 4 sprays of Bordeaux mixture was 77.3 Yuen.

• 根据成本计算；铜皂液一波尔多液处理区因防治而增收的利益为每亩77.；3元；而代森锌区刖为22