Planilha eletrônica para auxilio à tomada de decisão em manejo de irrigação

• Autor(a) principal: Nascimento, Patricia dos Santos [UNESP]
• Data de Publicação: 2012
• Outros Autores: Bassoi, Luís Henrique [UNESP], Paz, Vital Pedro da Silva
• Tipo de documento: Artigo
• Idioma: eng; por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://irriga.fca.unesp.br/index.php/irriga/article/view/381; http://hdl.handle.net/11449/73152
• topic: Irrigation depth; Soil water retention; Tensiometer; decision making; evapotranspiration; irrigation system; matric potential; soil water; spreadsheet; tensiometer; water retention; Brazil; Pernambuco

The irrigation scheduling is basically the adoption of pre-established criteria to define the time and the amount of water to be applied through irrigation systems. Hence, the objective of this work was to develop and test a spreadsheet of easy comprehension, handling and interpretation by growers, which uses as inputs the physical-hydric soil attributes and tensiometer readings to the determination of irrigation depth and time. The spreadsheet enables the grower to make reading and to know in a fast way how much water to apply into the soil. The test of the spreadsheet was performed in an irrigated orchard of grapevines in Petrolina, State of Pernambuco, Brazil. Soil water retention curves and tensiometer readings from the effective rooting depth were used as a basis for obtaining the soil water matric potential, soil water content, water availability, soil water content to be replaced, net and gross irrigation depth and irrigation time. The analysis of the use of the irrigation scheduling spreadsheet resulted in a shorter time for irrigation in relation to the irrigation scheduling based only on the crop evapotranspiration. The spreadsheet can be helpful to growers adjust irrigation depth when irrigation scheduling is based only on crop evapotranspiration.