soil data soil degradation soil depth soil disturbance soil does not soil drainage soil dries soil erosion soil fertility soil formation soil functions soil has soil have soil health soil here soil improvement soil improvers soil information soil is dry soil is rich soil layer soil layers soil level soil life soil liquefaction soil loss soil management soil map soil may soil mechanics soil microbes soil microbial soil microorganisms soil mix soil mixing soil mixture soil moisture soil more soil must soil needs soil nitrogen soil nutrient soil nutrients soil or water soil organic soil organic carbon soil organic matter soil organisms soil parameters soil particles soil ph soil pipe soil pollution soil preparation soil productivity soil profile soil properties soil protection soil quality soil reinforcement soil release soil release agents soil release polymers soil remediation soil removal soil research soil resources soil respiration soil rich soil salinity soil sample soil samples soil sampling soil science soil scientist soil scientists soil sealing soil should soil so soil solution soil stabilization soil structure soil surface soil survey soil taxonomy soil temperature soil temperatures soil test soil testing soil tests soil texture soil to grow soil treatment soil type soil types soil used soil vapour soil water soil water content