Abstract

Abstract. The use of drip irrigation in agriculture has enhanced the efficiency in the management of water and nutrients. Due to the increasing use of subsurface drip irrigation on large cultures such as sugarcane the demand for information in this field of knowledge is ever increasing. The experiments were carried in a greenhouse at Department of Natural Resources and Environmental Protection - CCA/UFSCar. Two PVC containers (500 L) filled with sandy soil followed by the installation of a network of 36 TDR probes for automatic monitoring of electrical conductivity were used. The dripper was installed at 0.30 m depth. This design provides observe the evolution of the wetted soil volume and the distribution of soil solution concomitantly as a function of time. Treatments were performed using flow rates of 1.0 and 1.6 L/h. Every hour it was applied 1.0 L of potassium nitrate (KNO3) solution to give a total of 10 applications. The results in both treatments demonstrated a gradual distribution of the soil solution and a higher concentration of the solution close to the dripper. Additionally, a superior tendency for horizontal displacement of the wetting front with the solution over 0,30 m from dripper position is observed.

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