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Spring Crop Choice (Canola, Lentil and Barley) Influence on Winter Wheat Yield
Ray Olson with Paul Peterson and Lawrence Brown, Spokane Co. Extension; Baird Miller, Ron McClellan and Stewart Wuest, WSU Compare yields, N carryover, and economics of canola, lentil, and barley, and determine their influence on winter wheat yields, erosion, and profitability of the rotation. Location: Rockford,
WA Previous crop: Spring canola We are reporting yields of the initial canola, lentil and barley and residual soil N after the canola, lentil and barley crops. The winter wheat yields are following either spring canola, lentil or barley. The plots run up and over a ridge and are 30 by 650 ft. Yield data is from a 12 by 650 ft swath. Soil samples, taken from each end of the plots, were combined for each treatment. The soil N carryover appears different between canola and lentils, but having only 2 replications was not adequate to detect a significant difference. The winter wheat following these spring crops was fertilized differently so that all three previous spring crop treatments would have equal available N. The winter wheat N rates were 70 lb N/ac following canola, 60 lb N/ac following lentil, and 90 lb N/ac following barley. The higher N rate following spring barley was necessary to compensate for N tie-up by the barley residue. Data
Conclusion The canola residue remaining after the 1993 harvest was significantly higher than the lentil and barley residue. Under the droughty conditions of the 1994 growing season, the winter wheat yields following spring lentils were greater than the winter wheat yields following spring canola or spring barley. The winter wheat test weight and grain protein percentage was not significantly different among the previous crop treatments. The total crop residue (winter wheat residue + previous crop residue carried over from the previous year) was also not significantly different among the previous crop treatments. However, there was a trend for higher total crop residue following canola, possibly as a result of the higher canola residues in 1993. |
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