Determination of the requirement and regime of reserve irrigations [wheat, spring and autumn irrigation]

agronomic characters agua del suelo analisis analyse analyse statistique analysis automne autumn cereales cereals condiciones ambientales condition de milieu contenido de agua en el suelo crops cultivation cultivo cultivos cultivos de grano eau du sol economic plants environment environmental conditions environmental temperature environnement grain crops irrigation medio ambiente methode methods necesidades de agua periodicidad periodicity plantas plante plante de culture plants pratique culturale primavera printemps productividad productivity profitability rendement rendimiento rentabilidad riego saison seasons soil water soil water content spring statistical analysis statistical methods statistics temperatura temperature temps teneur en eau du sol tiempo time timing trigo trigo de invierno water requirements wheats winter wheat yields