This method is effective in suppressing watergrass when deep water of at least 8 inches is held continuously until watergrass dies. There were a few escapes in these fields suggesting tolerance or resistance to deep water. Seed from these individuals was collected for evaluation. The deep water did not affect broadleaf weeds in one field and bullrush in the other. The broadleaf weeds required an herbicide application in field 5-3. Yield in field 2-1a was lower than the conventional field 2-1b but respectable compared to organic production. Yields in field 5-3 (checks a & b) were equivalent.

Comparison of the yields from deep water versus conventionally grown rice. Alt.= deep water and Conv.= conventional water levels.

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