FIELD TRIAL SUMMARY
N-Sure® UAN Blend on Head Lettuce
Location
USDA Spence Research Station, Salinas, California
Researcher
Richard Smith, University of California Cooperative Extension
Trial Type
Randomized Complete Block Design with Four Replications
Treatment
All N-Sure blends were applied by drip irrigation (all treatments had 15 lbs.
of N at planting)
App.
Method
1st App.
Lbs.
N/Acre
1.Untreated
-
0
2nd
App.
Lbs.
N/Acre
0
2. Standard
Tractor
65
3. Moderate
4. N-Sure/UAN 32
(25:75)
Tractor
Total
Lbs.
N/Acre
Mean
Head
Wt. Lbs
15
1.76
Fresh
Yield
Tons/
Acre
27.53
65
145
2.19
40
20
75
Drip
40
20
5. Standard
Drip
65
6. Moderate
Drip
Tractor
Treatment
7. Nitrapyrin 0.5 Lbs.
ai
Biomass
%N
Biomass
Lbs.
N/Acre
2.67
76.2
NUE
Lbs.
N/Ton
Biomass
-
34.35
3.69
119.5
4.22
2.02
31.62
3.11
93.0
2.37
75
2.20
34.47
3.11
102.1
2.18
65
145
2.26
35.43
3.36
112.96
4.09
40
20
75
2.00
31.39
2.92
89.4
2.39
40
20
75
2.17
34.06
3.06
97.5
2.20
RESULTS
•
Treatment 4, the N-Sure/UAN blend at 75 lbs. of nitrogen per acre, had the same yield as
treatment 5 at UAN at 145 lbs. nitrogen per acre.
•
Treatment 6, the moderate rate of UAN at 75 lbs. of nitrogen per acre, yielded 3.0 tons less than the
N-Sure/UAN treatment at the same rate of nitrogen per acre.
•
Adding N-Sure to UAN significantly improves the Nitrogen Use Efficiency (NEU) of UAN fertilizer by
adding a fourth, more slowly available form of nitrogen for a more balanced nutrient program.
Tessenderlo Kerley, Inc. makes no representation or warranty or guarantee, whether expressed or implied, disclaims any warranty of fitness for a particular purpose of merchantability, or
of product performance. For proper product performance and application recommendations, please refer to the product application guide on cropvitality.com.