Gce Model Questions Vol1 2024 Agricultural Science Question 32

A farmer wishes to till a 2.5 ha field using a power tillage machine rated at 15 kW. The implement width is 2.5 m and field efficiency is 0.75. Soil moisture is measured at 18 %, which reduces the travelling speed by 20 % from the base speed of 6 km h\(^{-1}\). (i) Calculate the field capacity (ha h\(^{-1}\)), the time required to till the whole field, and the total fuel consumption, given the machine's fuel use is 0.4 L kW\(^{-1}\) h. (ii) A larger 30 kW tractor could be used, which would maintain the base speed of 6 km h\(^{-1}\) under the same conditions and consumes 0.35 L kW\(^{-1}\) h. Determine its fuel consumption for the same job and state which machine is more economical in terms of fuel used. Give fuel quantities to one decimal place (L).