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Field studies by University of California Cooperative Extension staff compared compost topdressing with conventional fertilizer applications and also determined optimum depth and timing of compost applications. According to extension advisors Michelle Le Strange and Pamela Geisel, "The primary objective was to evaluate utility of fall applications of varying depths of compost as compared to a check, conventional and slow release fertilizers, and steer manure applications over a three-year period." Shifts in weed populations' turfgrass quality...