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This study had the objective to evaluate the effect of irrigation and fertigation (N) in the log pressure head of an Oxisol cultivated with sugarcane (second year). 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 (N). 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 fully realized at planting. Nitrogen was spread only in the treatment with 0% water replacement. Was evaluated log pressure head versus water content, at a depth of 40 cm, using RETC software. The logarithmic pressure head became more negative to a water content greater than 0.69 and 0.52 cm cm for water replacement of 25 and 50% with fertigation.

LOGARITHMIC PRESSURE HEAD AND WATER CONTENT OF AN OXISOL CULTIVATED WITH SUGARCANE (SECOND YEAR)