Ontologies

Climate

Variable	Description	Units	Name
Precipitation	Anyway of hydrometeor that falls from the atmosphere and reaches the earth's surface.	mm	prec
Temperature	Quantity referred to the notion of measurable heat.	°C	temp
Minimum temperature	Minimum temperature that the air can has in a time space.	°C	tmin
Maximum temperature	Maximum temperature that the air can has in a time space.	°C	tmax
Solar radiation	Radiant energy emitted by the sun from a nuclear fusion reaction that creates electromagnetic energy.	W/m²	sol_rad

Soil

Variable	Description	Units	Name
Salinity	Mineral salts content amount dissolved in a body of water	dS/m	sal

Abiotics indicators

Variable	Description	Units	Name
Number of water stress days	Number of days per growing season, for which the ratio of actual to potential evapotranspiration (ERATIO) is below 0.5. The ERATIO is computed following a simple water balance model as in Jones and Thornton (2009).	days	ndws
Number of days with water logging	Number of days per growing season, for which the soil is at least 50% between field capacity and saturation. Computed using the same simple water balance model as for NDWS.	days	ndwl
Extreme daily precipitation	The 95th percentile of precipitation per growing season, computed using the daily data.	mm	p95
Average precipitation	Average daily precipitation per growing season, computed using the daily data.	mm	ravg
Number of days high daytime temperature	Number of days per growing season, for which daytime temperatures exceed a threshold (depend crop). Temperatures above threshold (ºC) can affect the plant development. Daytime temperature is computed as Tday = 0.75 * Tmax + 0.25 * Tmin	days	nth
Number of days with low minimum temperatures	Number of days per growing season, for which minimum temperatures are below a threshold (depend crop). Temperatures below threshold (ºC) can affect the plant development. Daytime temperature is computed as Tday = 0.75 * Tmax + 0.25 * Tmin	days	ntl
Average minimum temperature	Average minimum temperature per growing season.	°C	tn
Average maximum temperature	Average maximum temperature per growing season.	°C	tx
Average solar radiation	Average solar radiation per growing season.	W/m²	sr
Monthly mean daylength	Daylength of the middle Julian day of month per growing season.	Hours	dl
Number of days with high VPD	The count of days per month for which VPD is equal or greater than 4 kPa. High VPD can lead to reduced stomatal conductance, and lower transpiration and photosynthesis.	days	nvpd4
Average VPD	Average per growing season VPD.	Kpa	vpd
Consecutive dry days	Maximum number of consecutive dry days (P <1 mm), per growing season.	days	cdd
Soil texture type	USDA texture class.		consecutive_dry_days_growing_season
Bulk density	Bulk density, averaged over the top 60 cm of soil.		bulk_density
Cation exchange capacity	Cation exchange capacity, averaged over the top 60 cm of soil.		cation_exchange_capacity
Organic carbon content	Soil organic carbon, averaged over the top 60 cm of soil.		organic_carbon_content