SGP/CO2FLX/C1 - Farm operation

Soil temperature, soil moisture, soil heat flux and upwelling surface radiation (long, 
short, and PAR) measurements were not valid from 20070822 to 20070907 due to farm operations.

Do not use specified data during the time period

• standard error of mean_t_soil_lower note maximum of two values used in
  calculation(stderr_mean_t_soil_lower)
• photosynthetic photon flux density (PAR)(ppfd_up)
• standard error of mean_g_soil(stderr_mean_g_soil)
• standard error of mean_m_soil_lower(stderr_mean_m_soil_lower)
• standard error of mean_t_soil_upper note maximum of two values used in
  calculation(stderr_mean_t_soil_upper)
• upwelling longwave hemispheric irradiance t_rad corrected(r_up_long_hemisp)
• standard error of mean_m_soil_upper(stderr_mean_m_soil_upper)
• average of four upper soil moisture sensors(mean_m_soil_upper)
• average of four lower soil moisture sensors(mean_m_soil_lower)
• standard error of mean_t_soil_middle note maximum of two values used in
  calculation(stderr_mean_t_soil_middle)
• average of up to four soil heat flux sensors(mean_g_soil)
• average of two middle soil temperature sensors(mean_t_soil_middle)
• average of two upper soil temperature sensors(mean_t_soil_upper)
• upwelling shortwave hemispheric irradiance t_rad corrected(r_up_short_hemisp)
• average of two lower soil temperature sensors(mean_t_soil_lower)