Lecture 1 - Agricultural Sustainability, Water Footprints & Drought Tolerance Glossary
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14 Terms
Double Cropping
Two crops on the same land in a calendar year
Evaporative demand
How dry the atmosphere is, determined by relative humidity & temperature
Evapotranspiration
Water loss by evaporation (soil) & transpiration (plant)
Grafted plant
Plant with genetically distinct scion & rootstock constructed by surgery
Harvest Index
Harvest Index
Passioura Identity
Equation to partition yield into component processes
Phenology
Crop development (= germination, growth, flowering, grain filling)
Rootstock
Genetic identity of root system of grafted plant
Sap Flow
Movement of water from roots to shoots = Transpiration stream
Scion
Genetic identity of shoot system of grafted plant
Silking
Appearance of maize silks = female part of maize flower
Staygreen
Crop retains green leaf area at end of cropping cycle
Stomata
Pores formed by 2 guard cells, mostly on underside of leaf
Stomatal conductance
Regulates photosynthesis (CO2 uptake) & transpiration (H2O loss) through the stomata – determined by stomatal aperture & density
Note 
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