Effects of different fertilization levels on water use efficiency of winter wheat under dryland conditions

aridoculture contenido de agua en el suelo contenido de materia seca cultivos de invierno culture d'hiver dry farming dry matter content fertilisation fertilizer application leaf area potentiel hydrique du sol shaanxi soil water content soil water potential superficie foliar surface foliaire teneur en eau du sol transpiration triticum uso del agua utilisation de l'eau water use winter crops