WATER CONSUMPTION BY POTTED CHRYSANTHEMUM UNDER GREENHOUSE CONDITIONS

rbeaa Revista Brasileira de Engenharia Agrícola e Ambiental Rev. bras. eng. agríc. ambient. 1415-4366 1807-1929 Departamento de Engenharia Agrícola - UFCG ABSTRACT The main objective of this research was to evaluate the evapotranspiration rate of the chrysanthemum (Dendrantema grandiflora cv. Puritan), cultivated in pots under greenhouse conditions. In order to get best representative data, the experiment was conducted at the Triângulo farm located in Holambra municipality in São Paulo State of Brazil, employing traditional tillage practices. The water requirement of this crop was estimated by comparing the chrysanthemum pot weight, during five different development stages of crop, with the evaporation from a modified class A pan and from a modified atmometer, and with the crop leaf area index. In each stage (treatment) five plants were evaluated, resulting in five repetitions per treatment. For a more representative weather conditions, the measurements were performed from August to December 1995 and from February to June 1996, on a two-month interval basis. A multiple regression analysis of the results showed that there is a statistical correlation between measured and estimated data, and also that the chrysanthemum evapotranspiration rate can be estimated considering the leaf area in each development stage of crop. Texto completo disponível apenas em PDF. Full text available only in PDF format. REFERÊNCIAS BIBLIOGRÁFICAS ALTHENHOFEN, J. A modified atmometer for on farm evapotranspiration determination. In: CONFERENCE ON ADVANCES IN EVAPOTRANSPIRATION, Chicago, 1985. Proceedings. Chicago: ASAE, 1985. p.177-184. ALTHENHOFEN J. A modified atmometer for on farm evapotranspiration determination CONFERENCE ON ADVANCES IN EVAPOTRANSPIRATION Chicago 1985 Proceedings Chicago ASAE 1985 177 184 KAMPF, A.N. Floricultura: um negócio lucrativo. Trigo e Soja, v. 102, p.3-4, 1989. KAMPF A.N. Floricultura: um negócio lucrativo Trigo e Soja 102 3 4 1989 KAMPF, E.; BAJAK, E.; JANK, M.S. O Brasil no mercado internacional de flores e plantas ornamentais. Informe GEP/DESR, v.3, n.4, p.3-11, abr. 1990. KAMPF E. BAJAK E. JANK M.S. O Brasil no mercado internacional de flores e plantas ornamentais Informe GEP/DESR 3 4 3 11 04 1990 MERCADO das flores. Informativo Semanal Cacex-Banco do Brasil, v. 22, n.1057, p.4-13, dez. 1987. MERCADO das flores Informativo Semanal Cacex-Banco do Brasil 22 1057 4 13 12 1987 MONTERO, J.I.; CASTILLA, N.; GUTIERREZ de RAVÉ, E.; BRETONES, F. Climate under plastic in the Almeria. Acta Horticulturae, n.170, p.227-234, 1985. MONTERO J.I. CASTILLA N. GUTIERREZ de RAVÉ E. BRETONES F. Climate under plastic in the Almeria Acta Horticulturae 170 227 234 1985 ROSENBERG, N.J.; McKENNEY, M.S.; MARTIN, P. Evapotranspiration in a greenhouse-warmed world: A review and a simulation. Agricultural and Forest Meteorology. v. 47, p.303-320, 1989. ROSENBERG N.J. McKENNEY M.S. MARTIN P. Evapotranspiration in a greenhouse-warmed world: A review and a simulation Agricultural and Forest Meteorology 47 303 320 1989 WILLMOTT, C.J. On the validation of models. Physical geography, v.2, n.2, p. 184-94, 1981 WILLMOTT C.J. On the validation of models Physical geography 2 2 184 194 1981