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Nitrogen Rates for Mustard

Stephen Guy, Roy Patten, Robert Gareau, John Johan

Objective

Evaluate nitrogen fertilizer rates on spring yellow mustard.

Location: Genesee, ID
Annual precipitation: 22 inches
Soil: Palouse
Rotation: 1992 - pea; 1993 - barley

Treatments

60 lb N/ac
100 lb N/ac
140 lb N/ac

Comments

Barley stubble was chiseled in the fall, leaving a large amount of residue and low residual N. On 15 April 94, 120 lbs/A of 16-20-0-14 was applied to all plots and incorporated with 2 passes of a field cultivator, followed by a harrowing. Yellow mustard was planted on 20 April at 8.5 lb seed/A. The nitrogen treatments were applied after seeding using a 14 ft drop spreader. It rained soon after fertilizing. Plots were harvested using an International 453 combine and weigh wagon. There were no herbicides or insecticides applied, and no significant weed or insect problems existed. Differences between N rate treatments were visible during the entire season.

Data

**Yield,** lb/ac
Treatment	Rep 1	Rep 2	Rep 3	Rep 4	Average
60 lb N/ac	1021	898	749	853	905a
100 lb N/ac	1252	1021	844	967	1021b
140 lb N/ac	1157	953	817	994	980ab
LSD (5%)					79
CV					4.7%

Test weight, lb/ac

Treatment Rep 1 Rep 2 Rep 3 Rep 4 Average

60 lb N/ac 56 55 55 55 55a

100 lb N/ac 56 56 56 53 55a

140 lb N/ac 56 55 55 55 55a

LSD (5%) 1.41

CV 1.5%

Conclusion

Fertilizer application rates were similar to the trial at the Lloyd ranch. A moderate N rate would appear to be the best for plant performance and economics. The limited response to N and low yield level may be due to lack of available moisture later in the growing season. Further testing is needed.

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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