1. Wheat Fertility Experiment No.406
Southwest Research and Extension Center Established 1966
Location: Altus
34°35'37.40"N, 99°20'21.72"W
TRT
Total N rate
(lb N / ac)
Pre-plant P rate
(lb P2O5 / ac)
Pre-plant K rate
(lb K2O / ac) 1. 2. 40 3. 80 4.
120 5.
160 6. 7. 8. 9.
10.
11.
12.
13.
N applied as (Urea)
P applied as (Triple Super Phosphate)
K applied as (Potash) S W N E
Plot size: 18.67’ x 60’
Alley: 30’
Total Trial Area: ’ 8” x 510’
SOIL TYPE: Tillman-Hollister – fine, mixed thermic Pachic Paluestoll
OBJECTIVE: To study fertilizer nitrogen, phosphorus, and potassium in winter wheat under irrigated conditions.
1, 2 – Harvest Sequence Number
1, 2 – Treatment Number
1 , 2 – Soil Sample Sequence Number
510 6 7 18 19 30 31 42 43 54 55 66 67 78
Rep 1
Pre-Plant N 13 12 5 10 1 4 2 11 9 8 3
450
420 5 8 17 20 29 32 41 44 53 56 65 68 77
Rep 2
Pre-Plant N 6 10 13 4 12 1 11 9 3 7 2
360 14 15 16 18 19 21 22 23 24 25 26
330 4 9 16 21 28 33 40 45 52 58 64 69 76
Rep 3
Pre-Plant N 7 2 11 12 10 8 1 5 13 6 3
270 27 29 30 31 32 34 35 36 37 38 39
240 3 10 15 22 27 34 39 46 51 58 63 70 75
Rep 4
TopDress N 4 12 13 5 1 7 11 9 8 2 6
180 40 41 42 43 44 45 47 48 49 50 52
150 2 11 14 23 26 35 38 47 50 59 62 71 74
Rep 5
TopDress N 1 5 13 7 3 8 4 6 10 9 12 90 53 54 55 56 57 58 60 61 63 64 65 60 1 12 13 24 25 36 37 48 49 61 72 73
Rep 6
TopDress N 9 6 2 3 7 10 4 8 11 5 66 67 68 69 70 71 74 75 76 77 78
18’8”
37’4”
56’
74’8”
93’4”
112’
130’8”
149’4”
168’
186’8”
205’4”
224’
242’8”