Salinity and nutrient distribution in soil profiles of long-term crop rotations

alberta aridoculture azote barbecho chimie du sol continuous cropping cultivo continuo culture continue depth dry farming experimentation fallow fosforo ion exchange nitrate nitrates nitratos nitrogen phosphore phosphorus procesos de transporte en el suelo profondeur profundidad rotation culturale rotational cropping sales salinidad salinity salts sel sodio sodium soil chemicophysical properties soil chemistry soil morphological features soil transport processes spatial distribution trait morphologique du sol transport dans le sol triticum aestivum