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Poucos sao os estudos que destacam o efeito de diferentes regimes hidricos sobre o crescimento de plantas da Caatinga; ao passo que modelos matematicos empiricos sao utilizados em larga escala na modelagem de crescimento de plantas, mas tambem tem sido pouco aplicados para especies desse bioma. Objetivou-se avaliar o crescimento inicial e o desempenho de modelos matematicos no ajuste de dados biometricos e de biomassa de especies ocorrentes na caatinga sob diferentes regimes hidricos. Um experimento foi conduzido, em condicoes de viveiro, no municipio de Serra Talhada, PE, com as especies Caesalpinia pyramidallis Tul. (catingueira) e Prosopis juliflora Sw (DC.) (algaroba) submetidas a regimes hidricos com base na evapotranspiracao de referencia (ETo) (50%.ETo, 75%.ETo, 100%.ETo e 125%.ETo). Ao longo do tempo foram feitas medicoes biometricas e de biomassa nas plantas. Foram testados os modelos de Gompertz, Sigmoidal, Logistico, Chapman e Gaussiano, usando como variaveis independentes, os dias apos a semeadura e graus dias acumulados. Os quatro regimes hidricos nao exerceram influencia na materia seca da raiz, e nao se observou diferencas para o acumulo de materia seca das folhas e da planta nas lâminas superiores a 75% de ETo. P. juliflora apresentou maior emissao de foliolos, porem nao se diferenciou em area foliar da C pyramidalis. As variaveis biometricas da catingueira e da algaroba foram melhores ajustadas pelo modelo de Gompertz, enquanto os de Chapman e Gaussiano foram os que mais explicaram a variacao dos dados de biomassa nos distintos regimes hidricos, utilizando como variavel independente os graus dias acumulados. A B S T R A C T Few are the studies that highlight the effect of different water regimes on the plants growth of the Caatinga; while empirical mathematical models are used in a large scale in the modelling of plants growth, but it also has been applied to species of this biome. Objective to evaluate the initial growth and performance of mathematical models in the adjustment of biometric and biomass data of species occurring in the caatinga under different water regimes. An experiment was conducted under conditions of viveiro, in the municipality of Serra Talhada, State of Pernmabuco, with the species Caesalpinia pyramidallis Tul. (catingueira) and Prosopis juliflora Sw (DC.) (algaroba) submitted to water regimes based on the reference evapotranspiration (ETo) (50%.ETo, 75%.ETo, 100%.ETo and 125%.ETo). Over time biometric and biomass measurements in plants were made. The Gompertz, Logistic, Sigmoid, Chapman and Gaussian models were tested, using as independent variables, the days after sowing and degrees days accumulated. The four water regimes do not exerted influence on root dry matter, and was not observed differences for dry matter accumulation of leaves and the plant in water regime greater than 75% of ETo. P. juliflora higher issuing leaflets, but not differentiated in leaf area of C. pyramidalis . Biometric variables of C. pyramidalis and P. juliflora were better adjusted by the Gompertz model, while Chapman and Gaussian were more explained the variation of biomass data in the different water regimes using as independent variable the degree days accumulated. Keywords: algaroba, biometrics, biomass, catingueira, degree days, modeling, nonlinear regression.

Espécies Caesalpinia pyramidalis Tul. e Prosopis juliflora Sw (DC.) sob Diferentes Regimes Hídricos: Crescimento e Ajuste de Modelos Matemáticos (Species Caesalpinia pyramidalis Tul. and Prosopis juliflora Sw (DC.) on Different Water Regimes: Growth ...)