LSU Soil Testing and Plant Analysis
Laboratory Analytical Performance
North American Proficiency Test (NAPT) Quarterly Results for last three years.
|
Test Date |
Percent Acceptable (%) ** |
|
Soil Analysis |
Plant Analysis |
|
1st Q, 2003
2nd Q, 2003
3rd Q, 2003
4th Q, 2003
1st Q, 2004
2nd Q, 2004
3rd Q, 2004
4th Q, 2004
1st Q, 2005
2nd Q, 2005
3rd Q, 2005
4th Q, 2005
|
95
94
95
90
90
99
93
92
91
97
95
96
|
100
95
100
90
97
80
85
95
75
100
95
87
|
** Based on a total of 133 and 42 analyses submitted for each round of proficiency soil and plant samples, respectively. The NAPT program sets 4xMAD (Median Absolute Deviation) as its control limits for each analysis. The common acceptable proficiency level for routine commercial laboratories is 75% on a yearly basis.