4. A 4-wheel tractor with 3X14 inches moldboard plow is to operate on clay loam soil (specific draft = 0.56 kg/cm2) at a depth of 25.4 cm. The maximum draft and percent increase in draft due to speed are: Gear Setting IL 2L 3L Speed (kph) Max. Draft (kg) Increase in draft due to speed (%) 3.2 4,000 14 4.8 3,100 28 6.4 2,200 42 8.0 1,300 56 4L b. 60 hp c. 65 hp d. 70 hp Determine the tractor horsepower required to perform the operation: a. 55 hp 5. A field measuring 45 m X 90 m is to be prepared using a 1-m upland power tiller at a speed of 3 kph. Assume a 10% overlap between passing and 9 seconds turn around time at the end of each pass. Determine the theoretical field capacity: a. 0.25 ha/hr b. 0.3 ha/hr c. 0.35 ha/hr d. 0.4 ha/hr