Evaluation of Fertilizer Performance of Different Formulations of Fertilizer Combined with Post-Emergent Broadleaf Weed Herbicides for Turfgrass

This study evaluates the growth of Kentucky bluegrass in a nutrient-controlled rootzone after the addition of the sponsor's fertilizer-herbicide combination. Data was collected on performance, root and shoot growth/rate, and resistance to disease. Four trials of the sponsor's product were compared to one trial of an industry standard and a controlled trial. All the experimental treats showed a similar pattern of healthy growth. The control group saw a surprising and steady drop in growth rate until it was harvested 100 days after initial treatment. The group that received the controlled NPK treatment resulted in the best initial and sustained growth over the trial. Researchers hypothesize that the initial growth before treatment of four weeks was not adequate time before adding the herbicide, however, if the herbicide-fertilize was applied any later the grass would risk a decline in growth.