1. Experiment #601 Long-term Top-Dress N Trial Stillwater, OK
Established 2002
TRT
Preplant N rate lb/ac†
Top-dress N rate lb/ac‡
Total N
February
March
1.** - 2. 45 3. 90 4.
135
5.** 6. 7. 8.
45*
9.**
10.
11.
12.
180
13.
14.
† - Pre-Plant N applied as urea (46-0-0) ‡ - Top-Dress N applied as UAN (28-0-0)
* - UAN
** - YP Plot
Location: LCB
36° 8'22.97"N, 97°16'56.53"W N E S W
Plot size: 16’ x 30’
Alley: 10’
Total Trial Area: ’ x 224’
OBJECTIVE: Evaluate top-dress nitrogen applications in winter wheat.
Treatments 1, 2, 3, and 4 were moved to February application in Spring 2019
1, 2 – Harvest Sequence Number
1, 2 – Treatment Number
1 , 2 – Soil Sample Sequence Number
150 4 5 12 13 20 21 28 29 36 37 44 45 52 53
Rep 4 7 2 8 11 6 9 1 10 3 14
120 43 46 47 48 49 50 51 54 55 56
110 3 6 11 14 19 22 27 30 35 38 43 46 51 54
Rep 3 1 13 10 5 7 2 9 4 12 8 80 29 31 32 33 34 36 37 39 40 41 42 70 2 7 10 15 18 23 26 31 34 39 42 47 50 55
Rep 2 11 4 1 3 14 5 6 9 13 12 8 40 16 17 19 20 21 22 24 25 27 28 30 1 8 9 16 17 24 25 32 33 40 41 48 49 56
Rep 1 6 12 3 13 2 11 7 5 10 14 4 64 80 96
112
128
144
160
176
192
208
224