Encontrados 6 documentos, a visualizar página 1 de 1
Sap flow scaling and crop coefficient of dry-farmed olive orchards converted to...
Santos, Francisco Lúcio; Valverde, Pedro; Reis, João; Ramos, Alice; Castanheira, NádiaTree water uptake is often estimated based in a crop coefficient kc, a ratio of the tree water uptake and a reference evapotranspiration, ET0. The concept behind estimating tree crop coefficient implies that data should be representative of the population of trees analyzed. Ideally it would require the monitoring of a large number of trees in each treatment population. This paper reports on a scaling method to ...
Efeitos da salinidade e fertilização azotada nos parâmetros hídricos e fotossin...
Coelho, Renato; Castanheira, Nádia; Santos, Francisco; Pereira, Dulce; Gonçalves, MariaUtilizando plantas de Sorgo Sacarino, investigou-se a possibilidade de atenuação do efeito inibitório da salinidade pela aplicação de fertilização azotada. As plantas foram crescidas em solo, numa estufa, e regadas com três níveis de solução de cloreto de sódio (0, 5 e 15 g L-1 NaCl) e três níveis de solução de nitrato de amónio (0, 0,4 e 0,6 g L-1 NH4NO3), num desenho experimental 3 × 3, com 4 repetições, num ...
Previsão da salinização e sodicização em solos regados com águas salinas com us...
Castanheira, Nádia Luísa Assunção SaraivaMestrado em Gestão e Conservação de Recursos Naturais - Instituto Superior de Agronomia / Universidade de Évora ; This work aims to predict the salinization and sodification in two soils when irrigated with saline waters combined with different fertigation levels. In a three years period, two experimental fields were set up with maize irrigated with a Triple emitter source (TES) irrigation system. The impact i...
Water use and response of a dry-farmed olive orchard recently converted to irri...
Santos, Francisco Lúcio; Valverde, Pedro; Ramos, Alice; Reis, João; Castanheira, NádiaExperimental results obtained in Southern Portugal from a dry-farmed mature olive tree orchard recently converted to drip irrigation are described. Water use and response to two irrigation management practices by olive trees was monitored with sap flow compensation heat pulse sensors, ‘Watermark’ granular matrix block sensors and a capacitance probe. The 80-plus-year-old mature olive tree orchard planted on a 1...
Comparative assessment of infiltration, runoff and erosion sprinkler irrigated ...
Santos, Francisco Lúcio; Reis, João; Martins, Olga; Castanheira, Nádia; Serralheiro, RicardoAbstract The impacts of sprinkler irrigation on infiltration, runoff and sediment loss of ten representative soils of Southern Portugal were assessed by laboratory sprinkler irrigation simulation tests. All soils showed very low permeability to applied water. The mechanical impact of water droplets enhanced soil dispersion and further lowered their infiltration capacity, particularly for high clay plus silt con...
Using polyacrilamide with sprinkler irrigation to improve infiltration
Bjorneberg, David; Santos, Francisco Lúcio; Castanheira, Nádia; Martins, Olga; Reis, João; Aase, J.K.; Sojka, R.EABSTRACT: Center-pivot irrigation systems often apply water at rates greater than the soil infiltration rate. Applying high molecular weight, water-soluble, anionic polyacrylamide (PAM) to the soil can improve infiltration and reduce soil erosion The objective of this study was to determine whether single and multiple PAM applications with sprinkler irrigation improved infiltration under field conditions. A tw...
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