Table 2: Means and variability of nutrient concentrationsa in biosolids collected and analyzed in Pennsylvania between 1993 and 1997 [12].

NutrientTotal Kjeldahl N
(%)
NH4-N
(%)
Organic N
(%)
Total P
(%)
Total K
(%)

Mean4.740.574.132.270.31
Standard deviation1.080.301.030.890.27

aConcentrations are on a dried solids basis.