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This study had the objective to evaluate the effect of irrigation and fertigation (NK) in the log hydraulic conductivity of an Oxisol cultivated with sugarcane. The experimental design comprised randomized blocks in a 5 x 2 factorial scheme, with four replications. Treatments consisted of five levels of water replacement (100, 75, 50, 25 and 0%), with and without fertirrigation (NK). The planting of sugarcane, cultivar RB85-5453, was performed in a double row (W-shaped), 8 m long, with 1.80 m spacing between the double rows, the distance between the crops in the double row was 0.40 m, with a total area of 52,8 m in each paddock. For treatments with water, replacement (WR) a drip tube was placed in the ground at a depth of 0.20 m among the furrows of the double row. The drip tube (DRIPNET PC 16150) comprised a thin wall, 1.0 bar pressure, nominal discharge 1.0 L h, and 0.50 m spacing between drippers. Nitrogen was applied by fertirrigation at a dose of 100 Kg ha, at 30-day intervals, with 10 applications throughout the development of the sugarcane culture. Potassium fertilization was done partially, in 30% of the furrows, and the remaining part was treated with the irrigation water. Nitrogen and potassium were spread only in the treatment with 0% water replacement. Was evaluated log hydraulic capacity versus pressure head, at a depth of 10 cm, using RETC software. The logarithmic hydraulic conductivity of the water replacement of 75% with fertigation was 3.3% higher than that 1 Doutor, Professor do IFGoiano – Câmpus Rio Verde. Rio Verde Goiás. Email: fredalsoares@hotmail.com 2 Doutorando, IFGoiano – Câmpus Rio Verde. Rio Verde Goiás. Email: fernandonobrecunha@hotmail.com. 3 Doutorando, IFGoiano – Câmpus Rio Verde. Rio Verde Goiás. Email: nelmiciofurtado@gmail.com 4 Doutor, Professor do IFGoiano – Câmpus Rio Verde. Rio Verde Goiás. Email: marconibt@gmail.com 5 Doutorando, IFGoiano – Câmpus Rio Verde. Rio Verde Goiás. Email: wilker.alves.morais@gmail.com 6 Graduando em Agronomia. IFGoiano Câmpus Rio Verde – GO. Email: fernandorcfilho@hotmail.com III INOVAGRI International Meeting, 2015 2755 observed in the water replacement of 75% without fertigation, even with application of a pressure head 16,9% greater in the water replacement 75% without fertigation.

LOGARITHMIC HYDRAULIC CONDUCTIVITY OF A OXISOL GROWING WITH SUGARCANE IN SOUTHWEST IRRIGATED GOIANO