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Weeds compete with rice and reduce yields by as much as 84% depending on weed species, rice variety and moisture availability. Weeds come second to drought in reducing rice yields. Weeds compete with rice for water, nutrients, sunlight and space. Tillage and cultivation practices, crop rotation and the use of herbicides, (or a combintion of these practices), are some of the methods used in managing the weed menace in upland rice.