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

中文翻译：

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腐殖质对沙基匍匐翦股颖果岭的评价

具有沙质根区的草坪草，例如高尔夫球场推杆果岭，在经济上非常重要，需要严格管理。然而，问题通常与沙基根区有关，例如养分保留率低和微生物活动有限。土壤添加剂可以增加土壤生物活性，提高氮（N）循环效率，从而减少肥料氮输入。对沙基匍匐翦股颖 ( Agrostis stoloniferaL.) 果岭，调查腐殖质产品是否可以增加土壤生物活性和改善草坪质量。处理包括腐殖质涂层尿素（HCU；2/3 比率和全比率）、HCU + 腐殖质分散颗粒 (HDG)、HCU + 黑石膏 (BG)、尿素、HDG 和未处理的对照。除了 HCU + BG 外，微生物生物量和活性的差异很小。相对于 HDG 和未处理的对照，HCU + BG 的潜在净 N 矿化作用高 60%。总体而言，与单独施氮肥相比，将腐殖质与施氮肥并没有提高草坪质量、覆盖度和修剪生物量。然而，向氮肥中添加 BG 增强了微生物活性（即潜在的净氮矿化）。