Each crop type favors and discourages a different spectrum of weeds. Perennial and forage crops can be excellent tools to control certain weeds. Having a diverse rotation allows diversity in the herbicide program to be used. It also spreads out risk and workload. One can handle more acres with the same fixed costs.
Diversity can also create the proper conditions for the subsequent crop.
For example, a dark colored residue produces a warmer seedbed in the spring. The next important component of Dwayne's philosophy is altering the intensity of the rotation. Proper intensity reduces risk. The other side of the coin is that rotations with excessive intensity will be too dry. That means poor plant growth in average years.