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year -- unless the previous crop was the same variety and grown from certified seecj The same applies to soybeans and other seed crops. This rule is rigidly adhered to, since there are always some volunteer plants coming up from seed from the previous crop. It is usually very difficult to find land that is entirely free of objectionable weeds. However, for certified seed production a farmer should plant on the cleanest land available, Many objectionable weeds can be controlled very effectively by chemical sprays, if done properly and at the proper time. Wild onion is one of the most troublesome weeds in small grain crops. This weed can be controlled by chemical sprays. Spraying should be done after the grain has fully tillered, but before it starts to joint. Spraying should not be done when the temperature is below 60 degrees Fahren
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