Evaluation Nitrogen and Phosphorus Placement With Strip Tillage
for Irrigated Pacific Northwest Corn Production David Tarkalson and
Dave Bjorneberg Agricultural Research Service, USDA Kimberly Idaho
Southern Idaho Nutrient Management Conference March 9, 2010
Shoshone, ID
Slide 2
Objective Evaluate corn production under strip tillage (ST) and
conventional tillage (CT), and various N and P fertilizer
placements under conditions found in southern Idaho
Slide 3
Methods Conducted field studies in 2007 and 2009 Soil =
Portneuf silt loam, 1-2% slope History = 80-100 years of furrow
irrigation. Erosion/Deposition Previous crop = Alfalfa Current
irrigation practices 2007 = Furrow 2009 = Linear move system (18
years) Treatments 1.Strip Tillage Band P Broadcast N 2.Strip
Tillage Broadcast P 22 N 3.Strip Tillage Band P Band N
4.Conventional Tillage Broadcast P 22 N 5.Conventional Tillage
Broadcast P Broadcast N Conventional Tillage = Chisel Plow, Tandem
Disk N rate = 105 lbs N/acre + Alfalfa credit (60 lbs N/acre)
46-0-0 and 32-0-0 P rate = 60 lbs P 2 O 5 /acre 11-52-0 and
10-34-0
Top Corn Grain Yield 20072009 ST-Band P-Broadcast N
ST-Broadcast P- 22 N ST-Band P-Band N CT-Broadcast P- 22 N
CT-Broadcast P-Broadcast N ST-Band P-Broadcast N ST-Broadcast P- 22
N ST-Band P-Band N CT-Broadcast P- 22 N CT-Broadcast P-Broadcast
N
Slide 16
ab a b b Top Corn Grain Yield 2007 a ab a b b 2009 11 bu 26 bu
ST-Band P-Broadcast N ST-Broadcast P- 22 N ST-Band P-Band N
CT-Broadcast P- 22 N CT-Broadcast P-Broadcast N ST-Band P-Broadcast
N ST-Broadcast P- 22 N ST-Band P-Band N CT-Broadcast P- 22 N
CT-Broadcast P-Broadcast N Economic Advantage (Yield + Tillage)
$56/acre Economic Advantage (Yield + Tillage) $114/acre
Slide 17
Bottom Corn Grain Yield a a a a a 2007 a a a a a 2009 ST-Band
P-Broadcast N ST-Broadcast P- 22 N ST-Band P-Band N CT-Broadcast P-
22 N CT-Broadcast P-Broadcast N ST-Band P-Broadcast N ST-Broadcast
P- 22 N ST-Band P-Band N CT-Broadcast P- 22 N CT-Broadcast
P-Broadcast N
Slide 18
Total Biomass
Slide 19
Questions
Slide 20
ab a b b Top Corn Grain Yield 2007 a ab a b b 2009 11 bu 26
bu
Slide 21
ab a b b 2007 Top Corn Grain Yield Top 11 bu
Slide 22
a ab a b b 2009 Top Corn Grain Yield Top 26 bu
Slide 23
Bottom Corn Grain Yield a a a a a 2007 a a a a a 2009