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EFEITOS DO MANEJO HIDRICO E DA APLICACAO DE POTASSIO NAS CARACTERISTICAS MORFOFISIOLOGICAS DE MUDAS DE Eucalyptus Grandis W. (Hill ex. Maiden)   Magali Ribeiro da Silva1; Antonio Evaldo Klar2; Jose Raimundo Passos31Departamento de Recursos Naturais, Faculdade de Ciencias Agronomicas, Universidade Estadual Paulista, Botucatu, magaliribeiro@fca.unesp.br2Departamento de Engenharia Rural, Faculdade de Ciencias Agronomicas, Universidade Estadual Paulista, Botucatu3Departamento de Bioestatistica, Instituto de Biociencias,  Universidade Estadual Paulista, Botucatu, SP   1 RESUMO  O trabalho teve por objetivo avaliar os efeitos do manejo hidrico e da adubacao potassica realizados durante a fase de rustificacao, na qualidade de mudas de Eucalyptus grandis. O experimento foi conduzido na Faculdade de Ciencias Agronomicas da UNESP – Botucatu, e constituiu-se de um fatorial 2X4, sendo dois manejos hidricos (mudas irrigadas ao atingir as tensoes de retencao de agua pelo substrato de 0,01 MPa ou 1,5 MPa) e quatro doses de K (0, 75, 150 e 300 mg L-1). Foram feitas avaliacoes de: altura da parte aerea, diâmetro de colo, materia seca da parte aerea e da radicular, materia seca total, area foliar, relacao altura da parte aerea / diâmetro de colo das mudas, teor de clorofila e taxa de transpiracao. Os resultados morfologicos indicaram que somente a materia seca radicular (MSR) diferiu estatisticamente em funcao do K aplicado. O estresse hidrico nao teve efeito nas caracteristicas morfologicas. Com relacao as caracteristicas fisiologicas, observou-se que os maiores teores de clorofila foram encontrados nas mudas submetidas ao maior estresse hidrico e maiores doses de K. As maiores taxas de transpiracao foram observadas nas mudas dos tratamentos submetidos ao estresse hidrico minimo. Nao houve variacao significativa entre as doses de K sobre a transpiracao.  UNITERMOS: Eucalyptus, rustificacao, qualidade de mudas, viveiro, fertilizacao.    SILVA, M. R. da; KLAR, A. E.; PASSOS, J. R. EFFECTS OF WATER MANAGEMENT AND POTASSIUM APPLICATION ON THE MORPHOPHYSIOLOGICAL CHARACTERISTICS OF SEEDLINGS OF Eucalyptus grandis  W. (Hill ex. Maiden)  2 ABSTRACTS  The objective of this study was to evaluate the effect of water management and potassium fertilizing applied during the hardening phase on the quality of Eucalyptus grandis seedlings. The experiment was conducted at the School of Agronomical Sciences of UNESP, Botucatu, and consisted of a factorial design 2X4; two water managements (seedlings irrigated when reaching water retention tensions by the substrate) and four doses of K (0, 75, 150 and 300 mg L-1). The following evaluations were made: shoot height, stalk diameter, shoot and root dry weight, total dry weight, leaf area, relation between seedling lap shoot height and diameter, transpiration rate and chlorophyll content. Morphological results showed that only the dry root weight differed statistically due to the K applied. The water management had no effect on the morphological characteristics. As to the physiological characteristics it was observed that the highest the chlorophyll contents were found in seedlings that had undergone the greatest water stress and K doses. The highest transpiration rates were observed in the seedlings of the treatments undergoing minimum water stress. The K levels did not influence transpiration statistically.  KEYWORDS: Eucalyptus, hardening, quality of seedlings, nursery, fertilization

EFEITOS DO MANEJO HÍDRICO E DA APLICAÇÃO DE POTÁSSIO NAS CARACTERÍSTICAS MORFOFISIOLÓGICAS DE MUDAS DE Eucalyptus Grandis W. (Hill ex. Maiden)