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A conditioned fertilizer product is provided. The conditioned fertilizer product includes urea containing fertilizer and lactic acid derived conditioning agent. The conditioning agent is preferably included at a concentration of between about 0.1% by wt. and about 5% by wt. The conditioning agent is preferably lactic acid, lactide, and/or polylactide. A method for conditioning fertilizer is provided including a step of mixing urea containing fertilizer and conditioning agent at a temperature of between about 135° C. and about 145° C. A method for using conditioned fertilizer product is provided.