Four seeding rates were tested using two durum varieties grown under dryland fallow, sprinkler irrigated and flood irrigated conditions. Seeding rates were based on number of pure live seed planted per acre. Sprinkler irrigated plots were irrigated on May 4 and June 20. Flood irrigated plots were irrigated on June 11. Under dryland condition in 2005, higher seeding rate resulted in lower hard vitreous amber color. Under sprinkler irrigation, higher seeding rate resulted in increased lodging, lower hard vitreous amber color, and greater yield. Under flood irrigation, higher seeding rate resulted in increased lodging and greater yield.
Response of durum to four seeding rates in 2005.
|
Dryland fallow Planted: April 14 Harvested: August 2 |
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|
variety |
Seeding Rate Seed/ac |
Heading, days from planting |
Height in |
Grain Protein |
HVAC* |
Test Wt |
Yield Bu/ac |
||||||
|
Plaza |
|
69.2 |
26.8 |
12.05 |
83.6 |
61.2 |
43.6 |
||||||
|
Mountrail |
|
69.6 |
31.1 |
12.08 |
87.4 |
61.3 |
50.9 |
||||||
|
LSD 0.05 |
0.3 |
1.4 |
ns |
3.7 |
ns |
1.8 |
|||||||
|
|
750,000 |
69.5 |
29.3 |
12.35 |
89.1 |
60.9 |
46.4 |
||||||
|
|
1,000,000 |
69.6 |
29.0 |
12.09 |
85.3 |
61.3 |
47.3 |
||||||
|
|
1,250,000 |
69.3 |
28.9 |
11.91 |
84.4 |
61.6 |
47.4 |
||||||
|
|
1,500,000 |
69.3 |
28.6 |
11.93 |
83.2 |
61.4 |
48.0 |
||||||
|
LSD 0.05 |
ns |
ns |
ns |
5.3 |
ns |
ns |
|||||||
|
Sprinkle irrigated Planted: April 28 Harvested: August 19 Previous Crop: Potatoes |
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|
variety |
Seeding Rate Seed/ac |
Heading, days from planting |
Height in |
Lodging index |
Grain Protein |
HVAC* |
Test Wt |
Yield Bu/ac |
|||||
|
Plaza |
|
58.0 |
33.5 |
0.0 |
12.75 |
81.2 |
61.3 |
97.3 |
|||||
|
Mountrail |
|
58.1 |
39.3 |
1.1 |
13.08 |
87.9 |
61.8 |
100.4 |
|||||
|
LSD 0.05 |
ns |
0.7 |
0.5 |
0.26 |
3.6 |
0.3 |
2.2 |
||||||
|
|
1,000,000 |
58.3 |
36.5 |
0.5 |
12.98 |
87.3 |
61.6 |
96.2 |
|||||
|
|
1,250,000 |
58.1 |
36.3 |
0.1 |
12.84 |
85.1 |
61.6 |
99.3 |
|||||
|
|
1,500,000 |
58.0 |
36.3 |
0.5 |
12.87 |
82.2 |
61.5 |
98.9 |
|||||
|
|
2,000,000 |
57.8 |
36.4 |
1.1 |
12.97 |
83.6 |
61.5 |
100.9 |
|||||
|
LSD 0.05 |
ns |
ns |
0.7 |
ns |
5.0 |
ns |
3.1 |
||||||
|
Flood irrigated Planted: April 20 Harvested: August 8 Previous Crop: Dry Beans |
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|
variety |
Seeding Rate Seed/ac |
Heading, days from planting |
Height in |
Lodging index |
Grain Protein |
HVAC* |
Test Wt |
Yield Bu/ac |
|||||
|
Plaza |
|
64.0 |
32.4 |
0.0 |
13.06 |
86.2 |
61.7 |
92.7 |
|||||
|
Mountrail |
|
63.9 |
38.1 |
0.9 |
13.34 |
91.2 |
62.3 |
97.9 |
|||||
|
LSD 0.05 |
|
1.0 |
0.2 |
0.21 |
2.8 |
0.3 |
3.0 |
||||||
|
|
1,000,000 |
64.1 |
35.3 |
0.1 |
13.18 |
89.8 |
61.7 |
93.2 |
|||||
|
|
1,250,000 |
64.0 |
34.8 |
0.5 |
13.14 |
87.2 |
62.1 |
94.2 |
|||||
|
|
1,500,000 |
63.9 |
35.2 |
0.6 |
13.30 |
89.5 |
61.9 |
95.8 |
|||||
|
|
2,000,000 |
63.9 |
35.7 |
0.6 |
13.17 |
88.4 |
62.2 |
98.0 |
|||||
|
LSD 0.05 |
ns |
ns |
0.3 |
ns |
ns |
0.5 |
4.2 |
||||||
* Hard vitreous amber color
When analyzed across four years under dryland conditions, higher seeding rate resulted in earlier bloom, reduced height, and lower hard vitreous amber color. When analyzed across three years under sprinkler irrigated conditions, higher seeding rate resulted in earlier bloom, greater lodging, lower grain protein and lower hard vitreous amber color. When analyzed across six years under flood irrigation, higher seeding rate resulted in earlier bloom, greater lodging, and higher yield.
Response of durum to four seeding rates across years.
|
Dryland fallow, 2001-2005 |
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|
variety |
Seeding Rate Seed/ac |
Heading, days from planting |
Height in |
Grain Protein |
HVAC* |
Test Wt |
Yield Bu/ac |
|||||
|
Plaza |
|
66.5 |
27.4 |
13.36 |
84.0 |
60.4 |
47.4 |
|||||
|
Mountrail |
|
66.8 |
31.0 |
13.49 |
| |||||||