That's more or less true, but irrelevant. From the Wikipedia article linked elsewhere in this conversation:
Schmeiser's principal defense at trial was that as he had not applied Roundup herbicide to his canola he had not used the invention. This argument was rejected; the court said that the patent granted for the invention did not specify the use of Roundup as part of the invention, and thus there was no basis for introducing the requirement that Roundup had to be used in order for the invention to be used. That is, a patent prohibits unauthorized use of an invention in any manner, not merely unauthorized use for its intended purpose.
Wait a minute. I just read the Canadian court opinion from which this tiny snippet was extracted. The context you've discarded includes:
* Schmeiser was a former Roundup-ready licensee
* Schmeiser admittedly used Roundup (the herbicide) in numerous circumstances after ceasing to pay licensing fees, which is part of the pattern of circumstances that led Monsanto to sue him
* Schmeiser actually verified, with Roundup, that his "volunteer" Roundup-ready crop was Roundup-ready, and then saved the seeds anyways
* Monsanto had at the time been removing volunteer Roundup-ready canola plants at their own expense from fields where farmers noticed it growing
The context of this specific paragraph also concerns Schmeiser's argument that Monsanto's patent did not apply except in cases where the unauthorized user sprayed crops with Roundup; he wasn't merely trying to exculpate himself, but was also attempting to overturn part of the patent.
Schmeiser's principal defense at trial was that as he had not applied Roundup herbicide to his canola he had not used the invention. This argument was rejected; the court said that the patent granted for the invention did not specify the use of Roundup as part of the invention, and thus there was no basis for introducing the requirement that Roundup had to be used in order for the invention to be used. That is, a patent prohibits unauthorized use of an invention in any manner, not merely unauthorized use for its intended purpose.