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Relações água-solo-planta-atmosfera • Rev. bras. eng. agríc. ambient. 3 (2) • May-Aug 1999 • https://doi.org/10.1590/1807-1929/agriambi.v3n2p145-149 linkcopy

Open-access ASSESSMENT OF CORN WATER UPTAKE BASED ON SAP HEAT TRACING UNDER WATER-STRESSED CONDITIONS1

AVALIAÇÃO DE ABSORÇÃO DE ÁGUA BASEADA NA TÉCNICA DO PULSO DE CALOR SOB CONDIÇÕES DE ESTRESSE HÍDRICO

AuthorshipSCIMAGO INSTITUTIONS RANKINGS

    ABSTRACT

    Crop water monitoring is an important aspect for precise control of irrigation. A reliable and movable technique is needed to properly assess water uptake of crops in the field. Water uptake by field grown maize ( Zea mays L.), in water-limited conditions was verified with the heat pulse system. The temperature difference between two radially inserted thermocouples, one 9 mm above and the other 4 mm below a heater piercing the maize stem, was measured every 0.3 sec following emission of a heat pulse in conditions of varied atmospheric demand. Comparisons of heat pulse system outputs and a high precision transpiration model estimates were done on hourly and daily basis, when low sap velocities were expected to occur. Hourly and daily basis of the heat pulse outputs and model estimates were in agreement. Sensitiveness of the technique was observed even for very low sap velocities.

    Key words:
    sap flow; transpiration; water stress; heat pulse

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    Unidade Acadêmica de Engenharia Agrícola Unidade Acadêmica de Engenharia Agrícola, UFCG, Av. Aprígio Veloso 882, Bodocongó, Bloco CM, 1º andar, CEP 58429-140, Tel. +55 83 2101 1056 - Campina Grande - PB - Brazil
    E-mail: revistagriambi@gmail.com
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