Evaluation of nitrate redistribution in surface and subsurface drip irrigation systems

Nitrogen compounds added to the soil may convert nitrate and cause contamination. The distribution uniformity of in surface vs. subsurface drip irrigation systems were compared a physical model consisting transparent glass box (1.20 x 0.5 1 m) sandy loam soil, considering emitter installation depths 0 30 cm, discharge rates Q1 = 2, Q2 4, Q3 8 L/h, fertilizer levels S1 125, S2 250, S3 375 mg/L. Irrigation continued for 6 h moisture sampling was performed 68 after initiation water front advance. result showed that doubling caused wetted area triple size system whereas it only doubled system. Thus system, when increasing level, spread out extensively therefore its concentration greatly reduced. Also, by discharge, difference between two increases because non-uniformity such form 125 mg/L, from 22% 500% (for 2 L/h), 43% 352% 4 14% 166% L/h). has more uniform trend than treatment with maximum flow level will create most optimal soil.