GPS-X Technical Reference

49 GPS-X Composite Variable Calculations
Table 4-10 - CNPLIB Nitrogen Composite Variables - ASM3 Model
STKN XTKN TKN TN
sno 1
snh 1 1 1
sni 1 1 1
snd 1 1 1
xnd 1 1 1
xbh inbm inbm inbm
xba inbm inbm inbm
xi inxi inxi inxi
xs inxs inxs inxs
ss inss inss inss
si insi insi insi
Table 4-11 - CNPLIB Nitrogen Composite Variables - NEWGENERAL model
STKN XTKN TKN TN
sno 1
snh 1 1 1
sni 1 1 1
snd 1 1 1
xnd 1 1 1
xbp fnzh fnzh fnzh
xbh fnzh fnzh fnzh
xba fnzh fnzh fnzh
xi fnzeh fnzeh fnzeh
xu fnzeh fnzeh fnzeh
Generally, soluble total phosphorus (STP) is equal to the sum of soluble phosphorus (sp)
and the phosphorus components of ss, si, and sf, as appropriate. Particulate total
phosphorus (XTP) is the sum of stored polyphosphate (xpp and xppr) and the phosphorus
components of xs, xi, xbh, xba, xbp and xmeoh. See Figure 4-6 for a schematic of these
calculations. The calculations differ slightly from model to model. Table 4-12 to Table
4-15 describe the phosphorus composite variable calculations.
GPS-X Technical Reference