Evaluation of humic fertilizers on a sand‐based creeping bentgrass putting green

Abstract Turfgrass with sand‐based root zones, such as golf course putting greens, are highly important economically and require intense management. However, problems often associated low nutrient retention limited microbial activity. Soil additives may increase soil biological activity, improve nitrogen (N) cycling efficiency, thus reduce fertilizer N inputs. A 2‐yr experiment was conducted on a creeping bentgrass ( Agrostis stolonifera L.) green to investigate whether humic products could activity turfgrass quality. Treatments included humic‐coated urea (HCU; 2/3 rate full rate), HCU + dispersing granules (HDG), black gypsum (BG), urea, HDG, nontreated control. Minimal differences were seen in biomass besides BG. The BG had 60% greater potentially net mineralization relative the HDG Overall, incorporating substances did not quality, cover, clipping compared alone. addition of enhanced (i.e., mineralization).