Force-field parameters for the simulation of tetrahedral intermediates of serine hydrolases

Agricultural implements are adapted to be concurrently mounted to a three point lifting device of a tractor. Each implement is provided with three connecting elements, each with forked ends. The forked ends of one of the implements have tines separated a greater distance than the tines of the corresponding forks of another agricultural implement, so that the forked ends of one of the implements straddle the corresponding forked ends of another implement. In this way, the implements can be concurrently mounted on the lifting arms of the three point device.