Abstract: A riding vehicle is provided with a downdraft fan assembly mounted on a vehicle roll bar for providing a flow of ambient air over the vehicle operator and a canopy carried by the fan assembly and providing solar and precipitation protection for the operator.

Abstract: For cutting the roots of weeds in agricultural fields, rolling knives in the form of flat, circular plates with sharp, peripheral edges are journaled to struts connected to a tool bar drafted in a direction of draft. The knives rotate about knife axes that are normal to knife planes containing their sharp edge. All knife axes are about 45.degree. from vertical. For bedded fields, the rolling knives are preferably connected to the tool bar in knife sets of two for each soil bed, with the knives of each set engaging opposite sides of each bed. As the rolling knives roll within the soil, their sharp edges sever the roots of weeds. In an alternate embodiment, a vertical stabilizer plate is rolled opposite each rolling knife to stabilize the soil therebetween. In another embodiment, each strut includes a hinge that has a hinge axis substantially within the knife plane. The knives swing about the hinge axes and trail in the direction of draft following the path of least resistance through the soil.