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Objetivou-se, com este trabalho, estabelecer comparações entre os bulbos molhados por gotejadores localizados na superfície do solo, e enterrados no final do ciclo da irrigação, além de avaliar modelos matemáticos para estimativa das dimensões desses volumes molhados. O estudo foi conduzido em um solo Podzólico Vermelho-Amarelo, em Fortaleza, CE. Em ambos os casos, foi aplicado simultaneamente, o volume de 4,33 x 10-3 m³ (4,33 L) de água numa vazão de 7,22 x 10-7 m³ s-1 (2,6 L h-1). O monitoramento da dinâmica da água no solo foi realizado através de tensiômetros. Ao final de dois ciclos de irrigação observou-se, no volume molhado sob gotejamento enterrado, um teor de água disponível variando entre 44 a 29% maior que no caso do emissor superficial. Dentre os modelos testados o de Schwartzmass & Zur apresentou melhor correlação com as determinações experimentais. The objective of this work was to establish comparisons among characteristics and dimensions of wetted volumes under surface and subsurface drippers at the end of an irrigation cycle and to evaluate mathematical models for predicting dimensions of these wetted volumes. The study was carried out in a Yellow-Red Podzol in Fortaleza-CE. Water volume of 4.3 x 10-3 m³ (4.33 L) was applied by drippers with flow rate of 7.22 x 10-7 m³ s-1 (2.6 L h-1) during the studied irrigation cycles. Soil water dynamics monitoring was accomplished by tensiometers. Measurements of soil-water potential were done before the irrigation event and during two irrigation cycles. At the end of the two irrigation cycles the water content that was available in the wetted volume under the buried dripper was 44 to 29% larger than the water content that was available in the wetted volume under the surface dripper. The Schwartzmass & Zur model resulted in a better approximation to the experimental data

Características e dimensões do volume de um solo molhado sob gotejamento superfical e subsuperficial