**Table [tab:conversions]: Useful conversions for entering site,
management, yield, and trait data [tab:conversions]**
| From ($X$) | to ($Y$) | Conversion | Notes | |:———–|:———|:———–|:——| |
$X_2=$root production | $X_1=$root biomass & root turnover rate |
$Y = X_2/X_1$ | Gill [2000] | | DD$^{\circ}$ MM’SS | XX.ZZZZ |
$\textrm{XX.ZZZZ} = \textrm{XX} + \textrm{MM}/60+\textrm{SS}/60$ | to
convert latitude or longitude from degrees, minutes, seconds to decimal
degrees | | lb | kg | $Y=X\times 2.2$ | | | mm/s | $\mu$ mol CO$_2$
m$^{2}$ s$^{-1}$ | $Y=X\times 0.04$ | | | m$^2$ | ha | $Y = X/10^6$ | |
| g/m$^2$ | kg/ha | $Y=X\times 10$ | | | US ton/acre | Mg/ha |
$Y = X\times 2.24$ | | | m$^3$/ha | cm | $Y=X/100$ | units used for
irrigation and rainfall | | | $\mu$ mol cm$^{-2}$ s$^{-1}$ | mmol
m$^{-2}$ s$^{-1}$ | $Y = X/10$ | | | mol m$^{-2}$ s$^{-1}$ | mmol
m$^{-2}$ s$^{-1}$ | $Y = X/10^6$ | | | mol m$^{-2}$ s$^{-1}$ | $\mu$ mol
cm$^{-2}$ s$^{-1}$ | $Y = X/ 10^5$ | | | mm s$^{-2}$ | mmol m$^{-3}$
s$^{-1}$ | $Y=X/41$ | Korner et al. [1988] | | mg CO$_2$ g$^{-1}$
h$^{-1}$ | $\mu$ mol kg$^{-1}$ s$^{-1}$ | $Y = X\times 6.31$ | used for
root_respiration_rate | | $\mu$ mol | mol | $Y= X\times 10^6$ | | |
julian day (1–365) | date | | see ref:
http://disc.gsfc.nasa.gov/julian\_calendar.shtml (NASA Julian Calendar)
| spacing (m) | density (plants m$^{2}$) |
$Y=\frac{1}{\textrm{row spacing}\times\textrm{plant spacing}}$ | | | kg
ha$^{-1}$ y$^{-1}$ | Mg ha$^{-1}$ y$^{-1}$ | $Y= X/1000$ | | | g
m$^{-2}$ y$^{-1}$ | Mg ha$^{-1}$ y$^{-1}$ | $Y= X/100$ | | | kg | mg |
$Y=X\times 10^6$ | | | cm$^2$ | m$^2$ | $Y=X\times 10^4$ | |