Evaluating effect of Fercristal Summum Nitro and 18-3-6 with UMAXX fertilizer on turf quality and nutrient efficiency in perennial ryegrass and bermudagrass

Welcome to The Turf Zone podcast. This episode features the article “Evaluating effect of Fercristal Summum Nitro and 18-3-6 with UMAXX fertilizer on turf quality and nutrient efficiency in perennial ryegrass and bermudagrass” written by Xunzhong Zhang, Mike Goatley, Berit Smith, Taylor Motsinger, and Sydney Hook. Introduction and Objective Improvement of nutrient use efficiency, especially nitrogen, is an important issue in turfgrass management with respect to plant health, quality, economics and environmental protection. New technology has been used to develop fertilizers which may have high nutrient use efficiency when compared to traditional fertilizer such as ammonium nitrate. The objective was to evaluate effect of Fercristal Summum Nitro (FSN) and 18-3-6 with UMAXX for improving N uptake and turfgrass performance in comparison with ammonium nitrate in perennial ryegrass and bermudagrass turfgrasses. Materials and Methods Perennial ryegrass (cv. ‘Gray Hawk’) and bermudagrass (cv. ‘Latitude 36’) plugs (4″ diameter) were collected from field plots and transplanted into 6-inch pots filled with fine sand plus 10% calcined clay in early June 2025. The grasses were trimmed, irrigated, and fertilized regularly. After about 4- weeks of non-stressed growth with optimum temperature, water, fertilizer, and light, the pots were grown in a controlled environment growth chamber at optimum growing conditions. The three treatments were arranged in a randomized block design with four replications. These treatment solutions were uniformly applied to the canopy: 1). Control standard ammonium nitrate at 0.10 lb N/1000 ft²) 2). Fercristal Summum Nitro at 0.1 lb N/1000 ft²) 3). 18-3-6 with UMAXX at 0.10 lb N/1000 ft²) biweekly. All nitrogen in the 18-3-6 with UMAXX is stabilized with dicyanodiamide and N-(in-butyl)-thiophosphoric triamide and the product contains 0.1% iron. The FSN contains 20.5% nitrogen and 18 amino acids. The soluble sustainable nitrogen (SSN) technology was used to improve nitrogen use efficiency. P and K and micronutrients were applied to all pots as base nutrients to support normal growth. Additional P and K in forms of potassium chloride and triple phosphate for treatments #1 and 2 were used to match P and K input for treatment #3. All treatments received no additional N inputs, and non-N nutrient solution was applied biweekly. Turf quality, fresh clipping weight, photochemical efficiency, leaf chlorophyll content, leaf protein, leaf proline, and leaf nitrogen content were measured biweekly during the period of 56 days. Root growth characteristics including root biomass, length, surface area, diameter, and volume were measured at the end of the trial. The data were analyzed with an analysis of variance and mean separations were performed with a protected Fisher’s least significance difference at 5% probability level. Results and Discussion Turf quality Foliar applications of Fercristal Summum Nitro (FSN) and 18-3-6 with UMAXX (abbreviation: UMAXX) improved turf quality when compared to the control (ammonium nitrate, AN) as measured from day 14 (July 22) through Day 56 (Sept. 2) in bermudagrass and perennial ryegrass. On average, both SSN and UMAXX consistently increased turf quality ratings relative to the control. Leaf chlorophyll content Foliar applications of FSN and UMAXX increased leaf chlorophyll content when compared to the control (ammonium nitrate as measured at day 42 (August 19) and Day 56 (Sept. 2) in bermudagrass and at day 29 (August 5) in perennial ryegrass. On average, both SSN and UMAXX increased chlorophyll content relative to the control in bermudagrass and also SSN in perennial ryegrass. Photochemical efficiency Foliar applications of FSN improved leaf photochemical efficiency when compared to the control (ammonium nitrate) as measured from day 14 (July 22), day 28 (August 5), and day 56 (Se