Title:	Irrigation requirements and transpiration coupling to the atmosphere of a citrus orchard.
Authors:	MARIN, F. R. ANGELOCCI, L. R.
Affiliation:	FÁBIO RICARDO MARIN, CNPTIA; LUIZ R. ANGELOCCI, ESALQ/USP.
Date Issued:	2011
Citation:	In: CONGRESSO BRASILEIRO DE AGROMETEOROLOGIA, 17., 2011, Guarapari. Riscos climáticos e cenários agrícolas futuros: anais. Guarapari: Incaper, 2011.
Description:	Crop evapotranspiration (ETc) was measured as evaporative heat flux from an irrigated acid lime orchard (Citrus latifolia Tanaka) using the aerodynamic method. Crop transpiration (T) was determined by a stem heat balance method. The irrigation requirements were determined by comparing the orchard evapotranspiration (ETc) and T with the reference evapotranspiration (ETo) derived from the Penman-Monteith equation, and the irrigation requirements were expressed as ETc/ETo (Kc) and T/ETo (Kcb) ratios. The influence of inter-row vegetation on the ETc was analyzed because the measurements were taken during the summer and winter, which are periods with different regional soil water content. In this study, the average Kc values obtained were 0.65 and 0.24 for the summer and winter, respectively. The strong coupling of citrus trees to the atmosphere and the strong coupling of the sensitivity of citrus plants to large vapor pressure deficits and air/leaf temperatures caused variations in the Kcb in relation to the ETo ranges. During the summer, the Kcb value ranged from 0.34 when the ETo exceeded 5 mm d-1 to 0.46 when the ETo was less than 3 mm d-1.
Thesagro:	Irrigação Irrigação por Aspersão
NAL Thesaurus:	Irrigation Orchards Citrus latifolia Meteorology Leaf conductance Sprinkler irrigation
Keywords:	Pomares cítricos Micrometeorologia Condutância estomática
Notes:	CBA 2011.
Type of Material:	Artigo em anais e proceedings
Access:	openAccess
Appears in Collections:	Artigo em anais de congresso (CNPTIA)