Data/hora: 03/06/2024 07:59:44

Biblioteca(s): | Embrapa Meio Norte / UEP-Parnaíba.
Data corrente: | 10/03/1993
Data da última atualização: | 10/03/1993
Autoria: | NIELSEN, D. C.; ANDERSON, R. L.
Título: | Infrared thermometry to measure single leaf temperatures for quantification of water stress in sunflower.
Ano de publicação: | 1989
Fonte/Imprenta: | Agronomy Journal, v.81, p.840-42, 1989.
Idioma: | Inglês
Conteúdo: | Quantification of water stress by infrared thermometry is routinely done on complete plant canopies to minimize the influence of viewed soilsurface. When plants are small or widely spaced, canopies may not be complet. This study was conducted to determine if Crop Water Stress Index (CWSI) values computed from infrared thermometer measurements of single-leaf temperatures of sunflower \{Helianthus annuus (L.) Triunph 566DW'] were correlated with oher measures of plant water stress. Plantswere grown under an automated rainotu shelter and subjected to four water treatments ranging from 0.0 to 100% replacement of evapotranspirational losses. The soil type is a Rago silt loam (fine, montmorillonitic, mesic Pachic Argiustoll). Statiscally significant correlations were found between CWSI calculated from single-leaf temperatures and stomatal conductance, CO2 exchange rate, leaf water potential, transpiration rate, and potential, transpiration rate, and percent available water in the active root zone. Calculating CWSI from single-leaf temperaturs measured with an infrared thermometer can provide a rapid means of assessing plant water status in incomplete canopies.
Palavras-Chave: | Canopy temperature; Infrared thermometry; Single leaf temperature; Techniques measurement.
Categoria do assunto: | --
Registro original: | Embrapa Meio Norte / UEP-Parnaíba (CPAMN-UEPP)
Exemplares: | CPAMN-UEPP - (2294-1) - ADD - SP - -- -  -  - 1993.01162 - DIS