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Spring Injection of Nitrogen and Sulfur on Winter Wheat

Investigate the spring application of nitrogen and sulfur by spoke wheel injection on winter wheat.

Location: Condon, Gilliam County, Oregon
Annual precipitation: 12 inches
Elevation: 2800 ft
Soil: Condon silt loam, 0 to 12 percent slopes
Rotation: Winter wheat/fallow
Tillage: Stubble mulch

Check
Inject 20 lb/ac N as solution 32 (Uran), 12-inch wheel spacing.
Inject 20 lb/ac N and 10 lb/ac S as solution 32 and Thiosol, 12-inch wheel spacing.

Anhydrous ammonia was applied at 35 lb/ac N in June 1993. Stephens winter wheat was seeded on 25 September 93 at 60 lb/ac with a JD HZ drill with 16-inch row spacing. Sencor and Finesse were applied for control of cheatgrass. Plots were injected 31 March 94. Nitrogen solution was 1:2.7 Uran:water applied at 15.5 gal/ac. Nitrogen/sulfur solution was 1:1.3:2.1 Thiosol:Uran:water applied at 15.5 gal/ac. Plots were 24 by 200 feet. Wheat was harvested on 8 August 94.

Data

Test weight of winter wheat, lb/bu

Treatment	Rep 1	Rep 2	Rep 3	Rep 4	Average
Check	59.2	59.3	59.0	58.9	59.1a
N	59.4	59.2	59.3	59.3	59.3a
N + S	60.1	59.6	59.1	58.7	59.3a
LSD (5%)					0.6
CV					0.53%

Conclusion

Winter and spring precipitation was well below average. Timely rains in May provided sufficient water to attain average yields in spite of very dry conditions. The crop did not respond to spring application of injected nitrogen or sulfur. Earlier application of injected nutrients or more spring precipitation may be necessary to get a crop response.

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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