Relations between relative evapotranspiration and predawn leaf water potential in soybean grown in several locations

The measurement of water consumption in the field is normally restricted to research purposes, although the development of practical field criteria for timing water application is required to improve crop productivity. To develop such a criteria irrigation experiments on Soybean were conducted from flowering to grain filling at four locations which differed in their soil properties and the convective contribution of their climates to potential evapotranspiration. A relationship has been establisherd between relative evapotranspiration and PWLP. If of general applicability, this relationship could be helpful for application in irrigation practice. / Le bilan énergétique, le potentiel hydrique de la feuille prélevée, la perte de l'humidité du sol et index de stress hydrique basés sur la température foliaire ont été mesurés - le type de sol, les phénomènes atmosphériques, produisent une relation linéaire commune entre l'évapotranspiration relative (RET) et le logarithme de PLWP. Cette relation peut être utile pour le calendrier d'irrigation une fois que les valeurs critiques de RET pour la productivité de la récolte sont connues.