Cumulative inorganic N leaching (kg N ha⁻¹) at 50 and 180 cm soil depths for control (CK), organic (B1A1, B2A1, and B3A1) and conventional (LS) treatments during a single rice growth cycle.

a<p>After subtraction of the leakage quantity measured in CK.</p>b<p>Different letters in a column denote a significant difference between treatments at the 0.05 level.