Integrating Probable Fieldwork Days into Nutrient Management Plans

1. John Lory, Ray Massey and Pat Guinan University of Missouri

2.  Are we doing our job?

3.  April through November  USDA data – ▪ Reporters’ opinion of soil conditions allowing equipment into the field ▪ Reported as “days per week” ▪ Over 30 years of data ▪ http://www.nass.usda.gov/Statistics_by_State/Missouri/ Publications/Crop_Progress_and_Condition/  Probability tool originally developed for Missouri.  Work to expand to IA, IL, and KS.

4. 0 1 2 3 4 5 6 7 Mar 27 Apr 10 Apr 24 May 08 May 22 Jun 05 Jun 19 Jul 03 Jul 17 Jul 31 Aug 14 Aug 28 Sep 11 Sep 25 Oct 09 Oct 23 Nov 06 Nov 20 Daysperweek

13.  Equipment Inputs to EstimateApplication Time  Capacity of spreader/tanker  Application width  Application travel speed  Applicator discharge rate  Travel time  Infield travel time  Road travel time  Applicator load time

14.  Equipment Inputs to EstimateApplication Time  Capacity of spreader/tanker  Application width  Application travel speed  Applicator discharge rate  Travel time  Infield travel time  Road travel time  Applicator load time

15.  4,800 Grow-Finish Operation  Generates enough manure to provide N for 400 acres of corn.  Application rate 175 lbs N/A (4,375 gal/A)  Fields average 1 mile from barn  LandApplication Equipment  6000 gallon tanker  15-foot swath injector  Travel speeds: ▪ Road: 10 mph ▪ In field, not applying: 7 mph ▪ In field, applying: 3.4 mph (requires 450 gal/min discharge rate) ▪ Loading time: 10 minutes/load  Application time estimate: 200 hours  Application efficiency estimate: 0.36

16.  Scenario 1  Northwest Missouri  Apply in April  Run tanker up to 12 hours per day, 6 days per week  Need 200 hours  Analysis  Mean: 130 hours fieldwork in April 12 % probability of success 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 0 50 100 150 200 250 300 ProbablityofCompletion Hours Available

17. 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 0 100 200 300 400 500 600 ProbablityofCompletion Hours Available  Solution 1 (need 200 hrs):  Expand application to May (ApplyApril to June 2 (2 months))  Mean: 305 hours fieldwork in April-May 87% probability of success April-May

18. 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 0 50 100 150 200 250 300 ProbablityofCompletion Hours Available  Solution 2:  Increase tank size to 7200 gal.  Get a nurse tank (road time goes to zero)  Need 130 hours  Mean: 130 hours fieldwork in April 53% probability of success April

19. 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 0 100 200 300 400 500 600 ProbablityofCompletion Hours Available  Solution 3:  Increase tank size to 7200 gal.  Get a nurse tank (road time goes to zero)  ApplyApril to June 2 (2 months)  Need 130 hours  Mean: 305 hours fieldwork inApril plus May April 1 – June 2 96% chance of success April - May

20. 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 0 50 100 150 200 250 300 ProbablityofCompletion Hours Available  Solution 4:  Increase tank size to 7200 gal.  Get a nurse tank (road time goes to zero)  Move 33% of application to fall  Need 130 hours. 86 hours April 71 % chance of success 44 hours from Nov. 18 -30 80% chance of success in Nov. April 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 0 20 40 60 80 100 ProbablityofCompletion Hours Available Nov. 18-30

21. 165 170 175 180 185 190 195 200 205 Field Distance (-) Swath Width (+) Tanker size (+) Road Travel Speed (+) FieldTravel Speed (+) Hourstocover400acres Base 20% change Field distance: 1.0 to 0.8 miles Tanker size: 6000 to 7200 gal. Field travel speed: 7.0 to 8.4 mph Swath width: 15 to 18 feet Road travel speed: 10 to 12 mph

22.  Expand to other states  Integrate into nutrient management reporting software  Quantitative approach for April - November

23.  Not covered by the Fieldwork database  Factors to consider  Soil temperature below 32oF (frozen soils)  Snow cover  Precipitation  Saturated soils

24. 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 Fractionofdayssoilsare<32oFon thatdayoftheyear Albany South Farm Lamar

25. 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 30 50 70 90 110 Lamar Novelty South Farm Probabilityofsuccess Days wanted

26.  Critical to integrate the concept of risk into nutrient management decisions. http://swine.missouri.edu/swine/PDFM.xls

Integrating Probable Fieldwork Days into Nutrient Management Plans

You are reading a preview.

Check these out next

Integrating Probable Fieldwork Days into Nutrient Management Plans

More Related Content

More from LPE Learning Center (20)

Recently uploaded (20)