Greenhouse research was conducted to examine effects of adding humic products to fertilizers on turfgrass. The objective of this study was to determine if the addition of humic products to fertilizers will increase turfgrass root and shoot morphological parameters. Kentucky bluegrass (KBG; Poa pratensis L.) and bermudagrass [Cynodon dactylon (L.) Pers.] were established in sand‐filled tubes. Treatments included synthetic fertilizer with black gypsum (22N‐0P‐3.3K, 30% gypsum and 4.7% humic acid), polymer‐coated humic‐coated urea (PCHCU; 2% humic acid), urea with humic dispersing granules (HDG; 70% humic acid), starter fertilizer (18N‐10.5P‐10K) with HDG, starter fertilizer, stabilized nitrogen, urea, and a control group. Fertilizers were applied at 48.8 kg N ha⁻¹ and HDG was applied at 44.4 kg ha⁻¹. Starter fertilizer and starter fertilizer with HDG increased KBG total root length (105 and 112%), root biomass (232 and 244%), and shoot biomass (205 and 204%) compared with urea. In KBG, PCHCU and urea with HDG increased total root length (37 and 20%) compared with urea. In bermudagrass, starter fertilizer and starter fertilizer with HDG increased total root length (241 and 248%), root biomass (672 and 707%), and shoot biomass (821 and 808%) relative to urea. Besides treatments with starter fertilizer, no treatments were different from urea for bermudagrass. These results suggest that starter fertilizer application is critical to turfgrass rooting at establishment. Adding humic products to the starter fertilizer did not increase rooting. In the absence of a starter fertilizer, PCHCU and urea with HDG improved KBG total root length compared with urea.

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温室建设期间肯塔基州蓝草和百慕大草生根对腐殖质肥料的响应

进行了温室研究，以检查向腐殖草中添加腐殖质产品到肥料中的作用。这项研究的目的是确定向肥料中添加腐殖质产品是否会增加草皮根和枝条的形态学参数。在装满沙子的试管中建立了肯塔基早熟禾（KBG; Poa pratensis L.）和百慕大早熟禾（Cynodon dactylon（L.）Pers。]。处理方法包括使用黑色石膏（22N-0P-3.3K，30％石膏和4.7％腐殖酸）的合成肥料，聚合物包被的腐殖质涂层尿素（PCHCU； 2％腐殖酸），带有腐殖质分散颗粒的尿素（HDG； 70） ％腐殖酸），含HDG的发酵剂肥料（18N-10.5P-10K），发酵剂肥料，稳定的氮，尿素和对照组。施肥量为48.8 kg N ha ^-1HDG的施用量为44.4 kg ha ^-1。与尿素相比，发酵剂和加HDG的发酵剂可增加KBG的总根长（105和112％），根生物量（232和244％）和枝条生物量（205和204％）。在KBG中，与尿素相比，PCHCU和HDG尿素增加了总根长（分别为37％和20％）。在百慕大草中，相对于尿素，发酵剂肥料和含HDG的发酵剂肥料增加了总根长（241和248％），根生物量（672和707％）和枝条生物量（821和808％）。除了使用起动剂肥料的处理外，其他方法与百慕大草的尿素没有区别。这些结果表明，起草肥料的施用对于草坪草生根生根至关重要。向腐殖肥中添加腐殖质产品不会增加生根。在没有肥料的情况下，