[Protection and recovery of agricultural soils]

amendement calcique conservation des sols contour cultivation cover plants crops cultivo en curvas de nivel cultivos culture en courbe de niveau drainage drenaje eau d'infiltration enmiendas calizas erosion farmland fertilisation fertilizer application groundwater recharge infiltration water labranza liming materials physiographic features plantas de cobertura plante de couverture plante de culture recharge de la nappe rompeviento rotation culturale rotational cropping soil conservation terre agricole tillage travail du sol windbreaks