1. Edwin M. Lentz, Agriculture and Natural Resources Educator, OSU Extension-Hancock County, 7868 CR 140, Findlay OH 45840
Abstract Methods Test weight, head number, and flag leaf N
ESN is a relatively new controlled-release N product for Ohio âą Medium maturity variety â Hopewell concentration means in response to 80 lb N/acre
wheat production. It is a polymer coated urea that the nitrogen âą Nitrogen applied prior to planting â 25 lb/acre
release is dependent upon temperature and moisture. The âą Plot dimension â 10 x 70 ft
from various N sources
objective of this study was to evaluate ESN as a nitrogen source âą Seeded at 1.6 million seeds per acre into soybean stubble - Test Weight Heads Flag leaf
N Source
for 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 âHopewellâ was established into soybean stubble âą Leaf analysis at heading - 50 flag leaves collected per plot
on the OARDC Northwest Research Station near Custar, Ohio. âą Five treatments broadcast applied at early green-up, 80 lb Urea 58.9c 52.0 3.8
Treatments included Urea, ESN, 75:25 urea:ESN blend, 50:50 N/acre
urea: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 3.7
80 pounds per acre was applied at greenup for each treatment. o ESN 44-0-0
Experimental design was a completely randomized block o 75:25 Blend â 75% Urea, 25% ESN
replicated four times. Analysis was a simple ANOVA. Grain yield, o 50:50 Blend â 50% Urea, 50% ESN 50 Urea: 50 ESN 59.5ab 52.0 3.8
test weight, spike number, and N uptake were measured for each o 25:75 Blend â 25% Urea, 75% ESN
treatment. Significant differences were observed among âą Experimental design - randomized block replicated four times 25 Urea: 75 ESN 59.2bc 44.0 3.7
treatments for yield. ESN yields were significantly less than urea âą Statistical analysis â simple ANOVA
and the 75:25 and 50:50 urea:ESN blends. The 75:25 urea:ESN
and 50:50 urea:ESN blends were similar to urea. Yields of the Results ESN 59.9a 44.0 3.5
25:75 urea:ESN blend was similar to ESN. ESN alone would not be
an adequate N source for wheat production in northwest Ohio. Grain yield for ESN, Urea and lsd0.05 0.5 ns ns
It may be a viable product when blended with urea as long as the
blend contains more than 50% urea. 78 Urea-ESN blend Treatments
cv 0.5 11.1 5.1
Introduction 76 77.1 means with different letters are significantly different
Environmentally Smart Nitrogen (ESNÂź) is a relatively new ns - no significance difference among means (p<0.05)
74 75.4
technology fertilizer for the wheat industry in Ohio. It is a lsd0.05 = 3.9
bushels per acre
polymer-coated urea product developed to perform as a 74.0
controlled-release nitrogen fertilizer. Limited University research 72
has been completed in Ohio that compares ESN to urea. Since Conclusions
ESN is more expensive to manufacture than urea, industry would 70
âą Lower yields may occur when ESN is applied as the only spring
like to blend ESN with urea to lower the cost per acre; 70.0
N source compared to urea
information is lacking on the potential benefits or problems with 68
68.3 âą Yields may be similar between urea-ESN blends and urea
urea:ESN blends.
66 provided that urea contributes 50% or more of the total N
requirements
Objective 64 âą Limited N released early in the spring growing season may have
Evaluate ESN as a nitrogen source for Ohio 62
lowered yields from ESN alone as suggested by the decrease in
number of heads compared to urea
wheat production Urea 75 Urea: 50 Urea: 25 Urea: ESN
25 ESN 50 ESN 75 ESN âą 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
âą ESN alone yielded less than urea
âą Data has been presented at 10 county and regional meetings to
âą Urea-ESN blends were similar to urea when blends
approximately 700 producers, consultants, and retailers
contained â€50% ESN
âą Test weights were larger for ESN alone than urea âą As a result of this and other research, industry now blends ESN
âą 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
âą 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