1. Wheat Fertility Experiment No.407
Southwest Research and Extension Center Established 1966
Location: Altus
34°35'41.20"N, 99°19'40.39"W
TRT
Total N rate
(lb N / ac)
Pre-plant P rate
(lb P2O5 / ac)
Pre-plant K rate
(lb K2O / ac) 1. 2. 20 3. 40 4. 80 5. 6. 7. 8. 9.
10.
11.
12.
N applied as (Urea)
P applied as (Triple Super Phosphate)
K applied as (Potash) S W N E
Plot size: 28’ x 100’
Alley: 30’
Total Trial Area: ’ x 750’
SOIL TYPE: Tillman-Hollister – fine, mixed thermic Pachic Paluestoll
OBJECTIVE: To study fertilizer nitrogen, phosphorus, and potassium in winter wheat under dry-land (rain-fed) conditions.
1, 2 – Harvest Sequence Number
1, 2 – Treatment Number
1 , 2 – Soil Sample Sequence Number
750 6 7 18 19 30 31 42 43 54 55 66 67
Rep 1
Pre-Plant N 9 2 3 1 10 12 4 8 11 5
650
620 5 8 17 20 29 32 41 44 53 56 65 68
Rep 2
Pre-Plant N 9 10 6 2 3 1 11 7 12 4
520 13 14 15 16 18 19 21 22 23 24
490 4 9 16 21 28 33 40 45 52 58 64 69
Rep 3
Pre-Plant N 5 10 8 2 6 7 1 3 11 12
390 25 26 27 29 30 31 32 34 35 36
360 3 10 15 22 27 34 39 46 51 58 63 70
Rep 4
Top-Dress N 1 4 5 8 6 7 9 12 2 11
260 37 38 40 41 42 43 44 45 47 48
230 2 11 14 23 26 35 38 47 50 59 62 71
Rep 5
Top-Dress N 9 7 3 4 12 6 5 8 10 1
130 49 51 52 53 54 55 56 57 58 60
100 1 12 13 24 25 36 37 48 49 60 61 72
Rep 6
Top-Dress N 3 10 8 4 7 9 11 6 5 2 62 63 64 65 66 67 68 69 70 71 28 56 84
112
140
168
196
224
252
280
308
336