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Canola Versus
Lentil in Rotation with Winter Wheat Yield
Ray
Olson
with Paul Peterson and Lawrence Brown, Spokane Co. Extension;
Baird Miller, Ron McClellan, and Stewart Wuest, WSU
Objective
Compare yields, N
carryover, and economics of canola and lentil and determine their influence
on winter wheat yields, erosion, and profitability of the rotation.
Location: Rockford,
WA
Annual precipitation: 17 inches
Soil series: Larkin silt loam
Field history: Spring wheat 92
Treatments
Previous crop:
Spring canola
Spring lentil
Comments
We are reporting
the initial canola and lentil yields and residual soil N levels after
the canola and lentil crops. The winter wheat yields are following either
spring canola or lentils. The plots run up and over a ridge and are 30
by 80 ft. Yield data is from a 12 by 800 ft swath. Soil samples, taken
from each end of the plots, were combined for each treatment.
We are considering
the soil N carryover as different between canola and lentils even though
the samples did not show a significant difference. N rates applied to
the winter wheat were 90 lb/ac following canola and 60 lb N/ac following
lentil. The lower N rate following lentils gives them a small N credit.
Data
Yield
of canola and lentil,
lb/ac
| Previous
Crop |
Rep 1 |
Rep 2 |
Rep 3 |
Rep 4 |
Rep 5 |
Rep 6 |
Average |
|
Canola |
1089 |
1325 |
1180 |
1334 |
1071 |
1207 |
1201 |
|
Lentil |
1634 |
1561 |
1833 |
1742 |
1643 |
1797 |
1702 |
Inorganic
soil N
to three feet, lb/ac. Sampled 7 Oct 93
|
Previous Crop |
North end |
South end |
Average |
|
Canola |
35 |
36 |
36a |
|
Lentil |
53 |
47 |
50a |
|
LSD (5%) |
|
|
44.5 |
|
CV |
|
|
8.2% |
Yield
of winter wheat,
bu/ac
| Previous
Crop |
Rep 1 |
Rep 2 |
Rep 3 |
Rep 4 |
Rep 5 |
Rep 6 |
Average |
|
Canola |
25.8 |
26.9 |
25.8 |
25.8 |
21.0 |
25.4 |
25.1a |
|
Lentil |
26.3 |
28.2 |
29.5 |
30.1 |
28.7 |
26.0 |
28.3b |
|
LSD (5%) |
|
|
|
|
|
|
2.9 |
|
CV |
|
|
|
|
|
|
7.4% |
Test
weight of winter wheat,
lb/ac
| Previous
Crop |
Rep 1 |
Rep 2 |
Rep 3 |
Rep 4 |
Rep 5 |
Rep 6 |
Average |
|
Canola |
13.68 |
14.12 |
14.06 |
13.86 |
13.91 |
13.52 |
13.86a |
|
Lentil |
13.97 |
13.74 |
13.88 |
13.75 |
13.62 |
13.25 |
13.70a |
|
LSD (5%) |
|
|
|
|
|
|
0.25 |
|
CV |
|
|
|
|
|
|
1.2% |
Grain
protein of winter wheat,
%
| Previous
Crop |
Rep 1 |
Rep 2 |
Rep 3 |
Rep 4 |
Rep 5 |
Rep 6 |
Average |
|
Canola |
13.68 |
14.12 |
14.06 |
13.86 |
13.91 |
13.52 |
13.86a |
|
Lentil |
13.97 |
13.74 |
13.88 |
13.75 |
13.62 |
13.25 |
13.70a |
|
LSD (5%) |
|
|
|
|
|
|
0.25 |
|
CV |
|
|
|
|
|
|
1.2% |
Winter
wheat residue,
lb/ac
| Previous
Crop |
Rep 1 |
Rep 2 |
Rep 3 |
Rep 4 |
Rep 5 |
Rep 6 |
Average |
|
Canola |
2096 |
2322 |
2142 |
3248 |
1986 |
2233 |
2338a |
|
Lentil |
2476 |
2284 |
2605 |
2328 |
3662 |
2779 |
2689a |
|
LSD (5%) |
|
|
|
|
|
|
887 |
|
CV |
|
|
|
|
|
|
23.8% |
Conclusion
Under the droughty
conditions of the 1994 growing season, the winter wheat yield following
spring lentils was higher than following spring canola. The previous crop
had no affect on the winter wheat test weight or grain protein. The winter
wheat residue production was also not significantly different between
previous crop treatments, but there was a trend for higher residue production
following lentils. This higher residue production would be associated
with the yield increases found.
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Contact
us: Hans Kok, (208)885-5971
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Accessibility | Copyright
| Policies | WebStats | STEEP Acknowledgement
Hans Kok, WSU/UI Extension Conservation Tillage Specialist, UI Ag Science
231, PO Box 442339, Moscow, ID 83844 USA Redesigned
by Leila Styer, CAHE Computer Resource Unit; Maintained by Debbie
Marsh, Dept. of Crop & Soil Sciences, WSU
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