| http://www.w3.org/ns/prov#value | - Take 2-3 samples from the root zone per acre in a zigzag pattern.??? He also recommends using crop rotation as a way to control harmful nematode populations. ???When rotating out of alfalfa, plant a non-host crop, such as small grain, beans or corn, for 2-4 years to reduce the nematode population in the soil.???
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