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Edwin M. Lentz, Agriculture and Natural Resources Educator, OSU Extension-Hancock County, 7868 CR 140, Findlay OH 45840Abstract Methods Test weight, head number, and flag leaf NESN is a relatively new controlled-release N product for Ohio • Medium maturity variety – Hopewell concentration means in response to 80 lb N/acrewheat production. It is a polymer coated urea that the nitrogen • Nitrogen applied prior to planting – 25 lb/acrerelease is dependent upon temperature and moisture. The • Plot dimension – 10 x 70 ft from various N sourcesobjective of this study was to evaluate ESN as a nitrogen source • Seeded at 1.6 million seeds per acre into soybean stubble - Test Weight Heads Flag leaf N Sourcefor wheat production in northwest Ohio. In Fall 2009, medium- no-till, seeded within 7 days of fly-free date lb/bu /ft row N%maturity variety ‘Hopewell’ was established into soybean stubble • Leaf analysis at heading - 50 flag leaves collected per ploton the OARDC Northwest Research Station near Custar, Ohio. • Five treatments broadcast applied at early green-up, 80 lb Urea 58.9c 52.0 3.8Treatments included Urea, ESN, 75:25 urea:ESN blend, 50:50 N/acreurea:ESN blend, and a 25:75 urea:ESN blend. A nitrogen rate of o Urea 46-0-0 75 Urea: 25 ESN 58.8c 52.0 3.780 pounds per acre was applied at greenup for each treatment. o ESN 44-0-0Experimental design was a completely randomized block o 75:25 Blend – 75% Urea, 25% ESNreplicated four times. Analysis was a simple ANOVA. Grain yield, o 50:50 Blend – 50% Urea, 50% ESN 50 Urea: 50 ESN 59.5ab 52.0 3.8test weight, spike number, and N uptake were measured for each o 25:75 Blend – 25% Urea, 75% ESNtreatment. Significant differences were observed among • Experimental design - randomized block replicated four times 25 Urea: 75 ESN 59.2bc 44.0 3.7treatments for yield. ESN yields were significantly less than urea • Statistical analysis – simple ANOVAand the 75:25 and 50:50 urea:ESN blends. The 75:25 urea:ESNand 50:50 urea:ESN blends were similar to urea. Yields of the Results ESN 59.9a 44.0 3.525:75 urea:ESN blend was similar to ESN. ESN alone would not bean adequate N source for wheat production in northwest Ohio. Grain yield for ESN, Urea and lsd0.05 0.5 ns nsIt may be a viable product when blended with urea as long as theblend contains more than 50% urea. 78 Urea-ESN blend Treatments cv 0.5 11.1 5.1Introduction 76 77.1 means with different letters are significantly differentEnvironmentally Smart Nitrogen (ESN®) is a relatively new ns - no significance difference among means (p<0.05) 74 75.4technology fertilizer for the wheat industry in Ohio. It is a lsd0.05 = 3.9 bushels per acrepolymer-coated urea product developed to perform as a 74.0controlled-release nitrogen fertilizer. Limited University research 72has been completed in Ohio that compares ESN to urea. Since ConclusionsESN is more expensive to manufacture than urea, industry would 70 • Lower yields may occur when ESN is applied as the only springlike to blend ESN with urea to lower the cost per acre; 70.0 N source compared to ureainformation is lacking on the potential benefits or problems with 68 68.3 • Yields may be similar between urea-ESN blends and ureaurea:ESN blends. 66 provided that urea contributes 50% or more of the total N requirementsObjective 64 • Limited N released early in the spring growing season may haveEvaluate ESN as a nitrogen source for Ohio 62 lowered yields from ESN alone as suggested by the decrease in number of heads compared to ureawheat production Urea 75 Urea: 50 Urea: 25 Urea: ESN 25 ESN 50 ESN 75 ESN • ESN may provide more N later in the growing season than urea as suggested by the increase in test weights N Source Result Highlights Outreach and Impact • ESN alone yielded less than urea • Data has been presented at 10 county and regional meetings to • Urea-ESN blends were similar to urea when blends approximately 700 producers, consultants, and retailers contained ≤50% ESN • Test weights were larger for ESN alone than urea • As a result of this and other research, industry now blends ESN • Heads for ESN < urea at p< 0.10, but similar at p<0.05 with urea or ammonium sulfate to minimize risk of yield loss • Leaf nitrogen concentration was similar among all N that may occur from some environments in Ohio ESN Urea sources at heading Acknowledgement ESN and urea:ESN blends were provided by Crop Production Services, Attica, OH