Data/hora: 13/06/2024 07:15:55

Provedor de dados: | 91
País: | Brazil
Título: | ASSESSMENT OF CORN WATER UPTAKE BASED ON SAP HEAT TRACING UNDER WATER-STRESSED CONDITIONS
Autores: | Santos,Antonio Odair; Bergamaschi,Homero; Rosa,Luís M. G.; Bergonci,João I.; Radin,Bernadete.
Data: | 1999-08-01
Ano: | 1999
Palavras-chave: | Sap flow; Transpiration; Water stress; Heat pulse.
Resumo: | 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.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43661999000200145
Editor: | Departamento de Engenharia Agrícola  - UFCG
Relação: | 10.1590/1807-1929/agriambi.v3n2p145-149
Formato: | text/html
Fonte: | Revista Brasileira de Engenharia Agrícola e Ambiental  v.3 n.2 1999
Fonte: | info:eu-repo/semantics/openAccess