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**Table \ref{tab:conversions}: Useful conversions for entering site, management, yield, and trait data \label{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 |  | % roots | root:shoot (q) | $Y=\frac{X}{1-X}$ | $\% \text{roots} = \frac{\text{root biomass}}{\text{total biomass}}$ |  | $\mu$ 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$^2$ | $Y=X\times 10^4$ | |