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Foliar Micronutrients for Winter Wheat

Test the effect of spring foliar micronutrient application on yield, test weight, and protein of soft white winter wheat.

Location: Tammany, Idaho
Annual precipitation: 14 inches
Soil: Silt loam
Rotation: Wheat/fallow

Check - no foliar micronutrients

Western Farm Service - 7-14-8, 0.1% iron, 0.05% zinc, 0.15% humic acid

McGregor Bushel Builder - 5-18-2-2, 0.4% iron, 0.8% zinc, 0.4% magnesium, 0.4% manganese, 0.1% copper, 0.l% boron, 0.05% molybdenum, 0.05% cobalt

Nu Chem Harvest Plus - 5-18-2-1, 0.4% iron, 0.8% zinc, 0.4% magnesium, 0.4% manganese, 0.1% copper, 0.1% boron, 0.05% molybdenum, 0.05% cobalt

The wheat variety was Stephens soft white winter. The foliar treatments were applied in mid April when the wheat was tillering, Feke's stage 3 to 4. The field had received 55 lb N/ac anhydrous in the fall. Plot size was 50 by 500 ft.

Data

Yield, bu/ac

Treatment	Rep 1	Rep 2	Rep 3	Rep 4	Average
NuChem	54	51	51	46	51a
WFS	54	56	51	50	53a
McGregor	53	56	51	48	52a
Check	50	52	52	51	51a
LSD (5%)					3.2
CV					3.9%

Conclusion

There were no significant differences in yield or test weight (average 61.1 lb/bu), although the McGregor treatment produced significantly higher protein than the other treatments. However, all of the protein readings were below 10% and suitable for the Pacific Rim low protein market. This is the second year that micronutrients showed no effect on yield under this farmer's management conditions.

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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