Concept:Established pasture is harvested by grazing or by mechanical forage cutting, not by grain-harvesting machines.
Explanation:Pasture can be harvested through methods such as grazing, zero grazing, using a mower, or cutting with a sickle.
A combine harvester is designed to harvest grain crops like maize, rice, or wheat.
It is not suitable for harvesting established pasture because pasture consists of grasses and forage plants, not grain.
Answer:C. Using combine harvester