NITROGEN ON IRRIGATED DURUM IN THE MONDAK REGION
Joyce Eckhoff, EARC Agronomist
The study was conducted under flood irrigation at the
Eastern Agricultural Research Center in Sidney. The objective was to determine N
recommendations for irrigated durum, and to compare durum and spring wheat responses to
applied nitrogen. Residual soil N to 4 feet was 32 lb/ac, residual soil P to 6 inches was
25 ppm, and residual soil K to 6 inches was 519 ppm. Nitrogen was applied as granular
ammonium nitrate (34-0-0) at six rates on 29 April 1998, and immediately incorporated.
‘Ben’ and ‘Monroe’ durum and ‘McNeal’ spring wheat were
planted on 29 April. Nitrogen was topdressed on half of each plot (four rows) in the form
of granular ammonium nitrate (34-0-0) on 15 June. Plots were irrigated on 4 June and 7
July, with about 3 inches of water applied each time. Entire plots were harvested on 10
August.
Yields were exceptionally low, possible due to early
season drought stress. Preplant N increased durum yields but did not increase spring wheat
yield. Topdressed N increased grain protein of durum and spring wheat, but topdressed N
did not affect durum protein at preplant rates above 80 lb/ac, while topdressed N
increased spring wheat protein up to preplant rates of 140 lb/ac
| N rate,
lb/acre |
‘Ben’
durum |
‘Monroe’
durum |
‘McNeal’
spring wheat |
| Preplant |
Topdress |
Yield Bu/ac |
Test Weight |
Grain protein |
Yield Bu/ac |
Test Weight |
Grain protein |
Yield Bu/ac |
Test Weight |
Grain protein |
| 0 |
0 |
54.0 |
63.6 |
12.7 |
50.0 |
62.0 |
12.1 |
53.6 |
61.6 |
11.3 |
| |
40 |
60.0 |
63.1 |
13.3 |
53.5 |
61.5 |
13.4 |
57.3 |
61.3 |
12.3 |
| 20 |
0 |
50.2 |
63.1 |
12.6 |
45.0 |
61.8 |
12.6 |
46.1 |
61.4 |
11.8 |
| |
40 |
54.5 |
62.9 |
13.8 |
52.3 |
61.9 |
13.8 |
52.6 |
61.2 |
13.0 |
| 50 |
0 |
55.7 |
63.2 |
12.8 |
54.0 |
61.9 |
12.8 |
53.4 |
61.1 |
12.6 |
| |
40 |
60.0 |
62.8 |
14.0 |
54.9 |
61.2 |
13.9 |
55.4 |
61.0 |
13.6 |
| 80 |
0 |
62.8 |
63.4 |
13.1 |
66.0 |
61.6 |
12.9 |
56.9 |
60.9 |
12.8 |
| |
40 |
61.1 |
63.1 |
14.1 |
67.4 |
61.9 |
13.5 |
53.5 |
60.7 |
13.8 |
| 140 |
0 |
68.6 |
62.9 |
13.8 |
62.2 |
61.2 |
13.8 |
58.1 |
60.8 |
13.9 |
| |
40 |
66.3 |
62.6 |
14.6 |
62.1 |
61.2 |
13.9 |
54.3 |
60.1 |
14.6 |
| 200 |
0 |
65.4 |
62.4 |
14.0 |
62.6 |
61.5 |
13.8 |
55.3 |
60.2 |
14.2 |
| |
40 |
65.6 |
62.1 |
14.6 |
63.4 |
61.1 |
14.2 |
55.4 |
60.0 |
14.4 |
| |
LSD 0.05 |
14.0 |
0.8 |
0.9 |
13.3 |
NS |
0.6 |
NS |
0.8 |
0.5 |
POTATO IRRIGATION
MANAGEMENT SIDNEY, MT
Joyce Eckhoff, EARC Agronomist
Jerry Bergman, EARC Superintendent
| |
|
|
Quality |
Yield,
cwt/ac |
| |
Harvest date |
Irrigation |
% > 6 oz |
% > 10 oz |
Specific Gravity |
Total |
>6 oz |
| SHEPODY |
|
|
|
|
|
|
|
| |
8 Sept |
Flood |
65.3 |
33.8 |
1.089 |
484 |
317 |
| |
|
Sprinkler |
51.3 |
19.8 |
1.097 |
382 |
195 |
| probability |
|
0.083 |
0.084 |
0.124 |
0.196 |
0.058 |
| RUSSET BURBANK |
|
|
|
|
|
| |
8 Sept |
Flood |
52.1 |
10.3 |
1.071 |
456 |
238 |
| |
|
Sprinkler |
42.3 |
2.3 |
1.077 |
425 |
181 |
| probability |
|
0.472 |
0.301 |
0.212 |
0.680 |
0.457 |
| |
15 Oct |
Flood |
77.0 |
48.0 |
1.076 |
497 |
382 |
| |
|
Sprinkler |
60.8 |
29.3 |
1.082 |
499 |
303 |
| probability |
|
0.038 |
0.136 |
0.071 |
0.977 |
0.323 |
|
