1. Results from Regional Algorithm Evaluation Study
Robert Mullen and Newell Kitchen
August 6, 2009
4/23/2019
NUE Meeting

2. Overview Discussion on how work has been done Individual site data
SAS discussion
Models currently used
Individual site data
Brief illustration of individual sites
Algorithm performance across all sites
Correlation information
Other analysis performed
4/23/2019
NUE Meeting

3. Analytical Approach Everything is SAS based SAS parameters
Very intricate code that allows us to conduct all the analysis with actually touching the data
SAS parameters
Low stands are thrown out of the data set (<19,000 plants/acre)
Inverse simple ratio (ISR) is computed from NDVI
For some reason, certain sites have disagreement between NDVI and ISR
4/23/2019
NUE Meeting

4. Analytical Approach
Currently using a quadratic plateau model to identify optimum N rates for each location
Each algorithm is hard coded so that N recommendations can easily be compared to optimum N rates for each location
4/23/2019
NUE Meeting

5. By-Site Data Y = -0.0055x2 + 1.18x + 71.52 Joint = 107 Plat = 135
4/23/2019
NUE Meeting

6. By-Site Data Y = -0.0039x2 + 1.08x + 102.49 Joint = 137 Plat = 177
4/23/2019
NUE Meeting

7. By-Site Data Y = -0.0031x2 + 0.82x + 113.04 Joint = 133 Plat = 168
4/23/2019
NUE Meeting

8. By-Site Data Y = -0.012x2 + 1.80x + 140.98 Joint = 75 Plat = 209
4/23/2019
NUE Meeting

9. By-Site Data Y = -0.0097x2 +1.79x + 137.32 Joint = 92 Plat = 220
4/23/2019
NUE Meeting

10. By-Site Data Y = -0.020x2 + 1.10x + 216.75 Joint = 27 Plat = 232
4/23/2019
NUE Meeting

11. By-Site Data Y = -0.020x2 – 0.14x + 141.25 Joint = 0 Plat = 141
4/23/2019
NUE Meeting

12. By-Site Data Y = -0.0021x2 + 0.92x + 72.16 Joint = 180 Plat = 168
4/23/2019
NUE Meeting

13. By-Site Data Y = -0.00x2 + 0.29x + 143.97 Joint = 180 Plat = 196
4/23/2019
NUE Meeting

14. By-Site Data Y = -0.0027x2 + 1.12x + 82.21 Joint = 180 Plat = 195
4/23/2019
NUE Meeting

15. By-Site Data Y = -0.0021x2 + 0.47x + 202.90 Joint = 109 Plat = 228
4/23/2019
NUE Meeting

16. By-Site Data Y = -0.020x2 + 1.17x + 79.15 Joint = 29 Plat = 96
4/23/2019
NUE Meeting

17. By-Site Data Y = -0.020x2 + 0.83x + 135.80 Joint = 21 Plat = 145
4/23/2019
NUE Meeting

18. By-Site Data Y = -0.020x2 + 0.80x + 199.87 Joint = 20 Plat = 208
4/23/2019
NUE Meeting

19. By-Site Data Y = -0.0035x2 + 1.04x + 132.45 Joint = 147 Plat = 209
4/23/2019
NUE Meeting

20. By-Site Data Y = -0.0048x2 + 1.12x + 156.95 Joint = 117 Plat = 222
4/23/2019
NUE Meeting

21. By-Site Data Y = -0.020x2 + 0.74x + 100.23 Joint = 18 Plat = 107
4/23/2019
NUE Meeting

22. By-Site Data Y = -0.0017x2 + 0.66x + 118.93 Joint = 180 Plat = 183
4/23/2019
NUE Meeting

23. By-Site Data Y = -0.0032x2 + 0.52x + 143.00 Joint = 81 Plat = 164
4/23/2019
NUE Meeting

24. By-Site Data Y = -0.020x2 – 1.01x + 194.76 Joint = 0 Plat = 195
4/23/2019
NUE Meeting

25. By-Site Data Y = -0.0037x2 + 1.01x + 115.19 Joint = 137 Plat = 185
4/23/2019
NUE Meeting

26. By-Site Data Y = -0.020x2 + 0.97x + 150.40 Joint = 24 Plat = 162
4/23/2019
NUE Meeting

27. By-Site Data Y = -0.020x2 - 0.16x + 147.53 Joint = 0 Plat = 148
4/23/2019
NUE Meeting

28. By-Site Data Y = -0.0034x2 + 0.66x + 110.87 Joint = 97 Plat = 143
4/23/2019
NUE Meeting

29. By-Site Data Y = -0.0043x2 + 1.45x + 68.74 Joint = 171 Plat = 193
4/23/2019
NUE Meeting

30. By-Site Data Y = -0.00078x2 + 0.78x + 69.29 Joint = 180 Plat = 184
4/23/2019
NUE Meeting

31. By-Site Data Y = -0.0011x2 + 0.35x + 110.53 Joint = 166 Plat = 140
4/23/2019
NUE Meeting

32. By-Site Data Y = -0.0062x2 + 1.14x + 127.34 Joint = 93 Plat = 180
4/23/2019
NUE Meeting

33. By-Site Data Y = -0.0021x2 + 0.63x + 117.28 Joint = 154 Plat = 166
4/23/2019
NUE Meeting

34. By-Site Data Y = -0.00046x2 + 0.48x + 42.11 Joint = 180 Plat = 114
4/23/2019
NUE Meeting

35. Algorithm Performance
4/23/2019
NUE Meeting

36. Algorithm Performance
4/23/2019
NUE Meeting

37. Algorithm Performance
4/23/2019
NUE Meeting

38. Algorithm Performance
4/23/2019
NUE Meeting

39. Algorithm Performance
4/23/2019
NUE Meeting

40. Algorithm Performance
4/23/2019
NUE Meeting

41. Algorithm Performance
4/23/2019
NUE Meeting

42. Algorithm Performance
4/23/2019
NUE Meeting

43. Algorithm Performance
4/23/2019
NUE Meeting

44. Algorithm Performance
4/23/2019
NUE Meeting

45. Algorithm Performance
4/23/2019
NUE Meeting

46. Algorithm Performance
4/23/2019
NUE Meeting

47. Algorithm Performance
4/23/2019
NUE Meeting

48. Algorithm Performance
4/23/2019
NUE Meeting

49. Additional Analysis Y = -0.014x2 + 3.01x + 5.81 r2 = 0.75 Joint = 107
Plat = 167
4/23/2019
NUE Meeting

50. Thanks!!!
Questions?
4/23/2019
NUE Meeting

51. Change in Nitrogen Need by Year
Data from NW Ohio – corn after beans
Year
Opt. N
Yield
1998
187
239
1999
160
184
2000a
170
157
2000b
149
153
2001
233
189
2002
169 89
2003
218
237
2004
162
193
2005
175
204
Avg
181
4/23/2019
NUE Meeting