Fertilizer
Rate & Timing on Soft White Winter Wheat
Kenneth & Dave
Wilken
with Larry J. Smith, UI/Nez Perce County Extension
Objective
To determine the
best fertilize regime (timing and rate) for nitrogen, phosphorous and
sulfur on soft white winter wheat.
Location: Kendrick,
Idaho
Annual precipitation: 22 inches per year
Rotation: Wheat, pea
Wheat variety: Cashup, soft white winter wheat
Treatments
|
Date |
Fertilizer |
Actual
N |
Pounds/
P |
Acre
S |
|
Treatment #1 |
Fall: |
100 lb of 30/36/0/7
plus 150 lb of ANS |
30
48 |
36
-- |
7
10 |
|
|
Spring: |
100 lb of ANS |
30 |
-- |
6 |
|
|
|
TOTAL
|
108 |
36 |
23 |
|
Treatment #2 |
Fall: |
150 lb of 30/36/0/7 |
30 |
36 |
7 |
|
|
Spring: |
120 lb of 40/0/06 |
48 |
-- |
7 |
|
|
|
100 lb of ANS |
30 |
-- |
6 |
|
|
|
TOTAL
|
108 |
36 |
21 |
|
Treatment #3 |
Fall: |
65 lb of 11/52/0 |
7 |
34 |
|
|
|
Spring: |
120 lb of 40/0/07 |
48 |
-- |
7 |
|
|
|
|
|
|
|
|
|
|
100 lb of ANS |
30 |
-- |
6 |
|
|
|
50 lb of 40/0/6 |
20 |
-- |
43 |
|
|
|
TOTAL
|
105 |
34 |
16 |
Comments
Nitrogen applications
were split as follows. All phosphorous was fall applied at rates of 346
to 36 lb/acre.
|
*Treatment #1 |
Fall applied
Spring applied
TOTAL |
70 lb N
30 lbs N
100 lbs N |
|
**Treatment #2 |
Fall applied
Spring applied
TOTAL |
30 lbs N
78 lbs N
108 lbs N |
|
***Treatment #3 |
Fall applied
Spring applied
TOTAL |
7 lbs N
98 lbs N
105 lbs N |
Data
Yield,
bu/ac
| Treatment |
Rep
1 |
Rep
2 |
Rep
3 |
Average |
| Treatment
1* |
90 |
90 |
90 |
90a |
| Treatment
2** |
86 |
83 |
97 |
89a |
| Treatment
3*** |
89 |
95 |
92 |
92a |
| LSD(5%) |
|
|
|
11 |
| CV |
|
|
|
5.27% |
Conclusion
There was no significant
difference between seed yield for the different fertilize treatments.
As a results, during the wet spring-summer of 1995, there was no advantage
for applying the fertilizer in split applications where most of the
nitrogen was applied either in the fall or the spring.
|
