Actual evapotranspiration and the pattern of soil water extraction of a soybean (Glycine max) crop

Autores/as

  • Lucía Curto Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Ciencias de la Atmósfera y los Océanos. Intendente Güiraldes 2160, Ciudad Universitaria. Ciudad Autónoma de Buenos Aires. Argentina. (C1428EGA).
  • Mauro Covi Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Ciencias de la Atmósfera y los Océanos. Intendente Güiraldes 2160, Ciudad Universitaria. Ciudad Autónoma de Buenos Aires. Argentina. (C1428EGA).
  • María Isabel Gassmann Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET). Godoy Cruz 2290. Ciudad Autónoma de Buenos Aires. Argentina (C1425FQB).

Palabras clave:

balance de agua en el suelo, secano, Argentina, estrés hídrico, consumo de agua, soja

Resumen

Crop evapotranspiration knowledge during different phenological stages helps determine crop water requirements and water use efficiency. This study was intended to estimate evapotranspiration of soybean grown under field conditions using the water balance equation and to characterize root water extraction across different soil layers analyzing daily values of its availability. In order to estimate the crop daily water consumption, temporal and spatial variability (vertical) of soil water content up to a depth of 1.10 m was investigated. At the beginning of the experiment, measurements showed that the soybean crop extracted water from the upper levels, and as it continued to grow, water uptake at deeper levels increased. The highest water uptake occurred during reproductive growth stages, which matched the period of highest atmospheric demand. The crop showed a better response to atmospheric demand under water availability, whereas under stress conditions, both evapotranspiration and soil water content decreased.

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Publicado

09-12-2019

Número

Sección

Ecofisiología y Manejo de cultivo