Late Season N Opportunities in Corn

Transcription

1 Late Season N Opportunities in Corn John Fulton 2016 South Dakota Agronomy Conference, Sioux Falls, SD

2 Today s Discussion Late-season N strategy Information to drive late-season N decisions **Field Execution Realities Touch on a few results

3 Nitrogen Use Efficiency = 0.97

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5 Nitrogen Application Windows Plant Side-dress Mid-season Late-season 100% 50% Percent of Total Nitrogen Uptake by plant 0% Image Source: Corn Stages by N Uptake

6 N Fuel Gauge Seasonal conditions? Apply Plenty of N EVALUATING - Applied N - Soil Supplied N - Optimized to profit - Year s growing conditions Soil Bank

7 Different Late-Season Practices Rescue N add more fertilizer after entire N budget has been applied. Late-Season N intentionally delaying part of N budget to late season. - V10 to R - Variable-rate N opportunities (profitable) - Improve N recovery and yield - Delay how much? 10% to 40% of N budget

8 Late-Season N Strategy Delay decision on total applied N for the year. - Allow mother nature to play her cards - Evaluate corn and soil situation - Adjust Planned N, if needed

9 Information for Late-Season Decisions Food, Agricultural and Biological Engineering

10 Nitrogen Application Windows Plant Side-dress Mid-season Late-season 100% 50% Percent of Total Nitrogen Uptake by plant 0% Image Source: Corn Stages by N Uptake Field Intel and Executional Precision

11 Bare Soil (April 17) Food, Agricultural and Biological Engineering

12 Soil Sampling Sites Food, Agricultural and Biological Engineering

13 Food, Agricultural and Biological Engineering ADVI Image; Biomass Footprint July 12th

14 How much to apply (lb N /ac)? Soil Nitrate Results Sample ID NO3-N (ppm)

15 Prescription Creation (Rx) INFORMATION Imagery (WHERE) = zones Agronomic knowledge (HOW MUCH) - Smart Scouting - Weather information - Soil N samples? - Prior production knowledge

16 Field Execution Realities Food, Agricultural and Biological Engineering

17 Field Execution RX High Clearance Placement

18 Late-season Application 2016 Machine Learnings - RTK - High clearance Food, Agricultural and Biological Engineering

19 Clearance Height (inches) Food, Agricultural and Biological Engineering

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21 Clearance Considerations Food, Agricultural and Biological Engineering

22 Clearance Considerations Food, Agricultural and Biological Engineering

23 Late-season Placement Options Droptube Coulter Injection Y-drop $38k to $45k new / $20k to $25k used (40-ft NTB) $16,500 for 60-ft

24 Yield / Profit Results Food, Agricultural and Biological Engineering

25 Late-Season Results Purdue University, The earlier the application the better but profitable responses have been obtained as late as 2 to 3 weeks after tasseling. +17 BU +12 BU Ohio State Most profitable (+$40/ac): Planter: Side-dress: Lateseason

26 2016 Focus Field Results TRT Total Applied Units of N (lb/ac) N Cost ($/ac) AVG Yield (bu/ac) Profit /Loss ($/ac) NUE (lb N/bu) N Application Timing Standard 200 $ $ Pre-plant + 2x2 B (Rx) 199 $ $ Pre-plant + 2x2 + LS C 160 $ $ Pre-plant + 2x2 Late-Season Pass Cost ($/ac) Custom $14.00 Owned Machine $4.00

27 Aim for Optimum N Rates Adaptive N Mngt - Adjust as appropriate for N loss conditions - Soil mineralization of N. - Set N budget for each field o Assess your own N loss risk (imagery & models) o +/- 30 to 40 lbs N in any given year Field-by-field basis Evaluate in-season with imagery + smart scouting. Consideration: Good Starter, Solid Side-dress, *Late-season Strive to improve your nutrient management and consider on-farm research.

28 Digital Agriculture Providing solutions to meet world demand John Fulton Ohio State Precision Ag Program Facebook: Ohio State Precision Ag