Andisol Environmental science, engineering & technology FAO56 dual-Kc approach Gleam Product Phreatophyte S-index Technology: general issues aggregate stability air capacity allophane arid sandy land bulk density compost cover crops deep infiltration deep soil recharge diurnal fluctuations ecological restoration evapotranspiration evapotranspiration modeling and partition forest restoration freeze–thaw groundwater gully erosion hysteresis infiltration infrastructure inter-row management macroporosity nocturnal sap flow