MORPHOLOGICAL AND PHYSIOLOGICAL INDICES AND LETTUCE (Lactuca sativa L.) YIELD IN NATURAL AND PROTECTED AMBIENTS

rbeaa Revista Brasileira de Engenharia Agrícola e Ambiental Rev. bras. eng. agríc. ambient. 1415-4366 1807-1929 Departamento de Engenharia Agrícola - UFCG ABSTRACT The objective of this research was to evaluate and to compare the growth and yield of lettuce. Two experiments were conducted in the experimental area of Physics and Biophysics Department of the Biosciences Institute of Paulista State University, Botucatu Campus (22º54'S; 48º27'W; 850m) in the summer of 1995/96 and winter of 1996, with three plots of 7m x 5m, where two were located in the greenhouse (tunnel type), in the East-West and North-South directions, and the other plot under natural or external conditions. The absolute growth rate in the summer was 5.22 g.week-1 in the greenhouse, and 3.97 g.week-1 in the external plot, while in winter these values were 3.02 e 2.8 g.week-1. The net assimilation rate suffered more influence from greenhouse conditions than from year period. The crop growth rate showed clearly that under greenhouse conditions the growth rate was quicker. According to the yield results, it is concluded that the protected environments had a influence in the two-year periods, with little advantage for the winter. Texto completo disponível apenas em PDF. 1 Parte da Tese de Doutorado do primeiro autor REFERÊNCIAS BIBLIOGRÁFICAS BLACKMAN, G.E. The application of the concepts of growth analysis to the assessment of productivity. In: ECKARDT, F.E. (ed). Functioning of terrestrial ecosystems at the primary production level. UNESCO, Paris, p. 243-59, 1968. BLACKMAN G.E. The application of the concepts of growth analysis to the assessment of productivity ECKARDT F.E. Functioning of terrestrial ecosystems at the primary production level UNESCO Paris 243 259 1968 BENINCASA, M.M.P. Análise de crescimento de plantas. Jaboticabal: FUNEP, 1988, 42 p. BENINCASA M.M.P. Análise de crescimento de plantas Jaboticabal FUNEP 1988 42 p CAMARGO, L.S. Alface. In: As hortaliças e seu cultivo. 2. ed. São Paulo: Fundação Cargill, 1984 p. 121-9. CAMARGO L.S. Alface As hortaliças e seu cultivo 2 São Paulo Fundação Cargill 1984 121 129 CAUSTON, D.R.; VENUS, J.C The biometry of plant growth. London: Edward Arnold, 1981. 307p. CAUSTON D.R. VENUS J.C The biometry of plant growth London Edward Arnold 1981 307p FILGUEIRA, F.A.R. Cichoriáceas: alface, chicórea e almeirão. In: Manual de olericultura: cultura e comercialização de hortaliças. 2. ed. São Paulo: Agronômica Ceres, 1982. 338p. FILGUEIRA F.A.R. Cichoriáceas: alface, chicórea e almeirão Manual de olericultura: cultura e comercialização de hortaliças 2 São Paulo Agronômica Ceres 1982 338p MILTHORPE, F.L. The relative importance of the different stages of leaf growth in determining the resultant area. In MILTHORPE, F.L. (Ed) The growth of leaves. London: Butterworths Scientific, 1986. p. 141-50. MILTHORPE F.L. The relative importance of the different stages of leaf growth in determining the resultant area MILTHORPE F.L. The growth of leaves London Butterworths Scientific 1986 141 150 SEGOVIA, J.F.O.; ANDRIOLO, J. L.; BURIOL, G. A.; SCHNEIDER, F. M. Comparação do crescimento e desenvolvimento da alface (lactuca sativa L.) no interior e no exterior de uma estufa de polietileno em Santa Maria, RS. Ciência Rural, V.27, n.1, p. 37-41, 1997. SEGOVIA J.F.O. ANDRIOLO J.L. BURIOL G.A. SCHNEIDER F.M. Comparação do crescimento e desenvolvimento da alface (lactuca sativa L.) no interior e no exterior de uma estufa de polietileno em Santa Maria RS Ciência Rural 27 1 37 41 1997 STOY, U. The translocation of C14 labelled photosynthetic products from the leaf of the ear in wheat. Physiology plants. V.16, p. 851-66, 1983. STOY U. The translocation of C14 labelled photosynthetic products from the leaf of the ear in wheat Physiology plants 16 851 866 1983