Estimation of Nitrate Leaching in an Entisol under Optimum Citrus Production

Leaching of fertilizer nutrients and widespread NO 3 -N contamination of drinking water wells in proximity to citrus growing regions of central Florida are a serious concern. We evaluated NO 3 -N distribution in soil solution at various depths in the vadose zone, and N leaching below the root zone for two cropping seasons under the canopy of 21-yr-old Hamlin orange [Citrus sinensis (L.) Osbeck] trees on Cleopatra mandarin (Citrus reticulata Blanco) rootstock, on an entisol of central Florida. The treatments included 112, 168, 224, and 280 kg N ha -1 yr -1 as either dry granular fertilizer (DGF; broadcast, in 4 equal doses) or fertigation (FRT; 15 applications yr -1 ), and 56, 112, and 168 N kg ha -1 yr -1 as controlled-release fertilizer (CRF; single application yr -1 ). Irrigation was scheduled using recommended tensiometer set points as guidelines, with a target wetting depth of 90 cm. The NO 3 -N was measured in soil solutions bi-weekly at 60-, 120-, and 240-cm depths using suction lysimeters (SLs) installed under the tree canopy. The 240-cm depth sample represented soil solution below the rooting depth of the trees, and the NO 3 -N at this depth could contaminate groundwater. At the 60- or 120-cm depths, the NO 3 -N concentrations occasionally peaked at 12 to 100 mg L -1 , but at 240 cm NO 3 -N concentrations mostly remained below 10 mg L -1 , The careful irrigation management, split fertilizer application, and timing of application contributed to the low leaching of NO 3 -N below the root zone. Calculated NO 3 -N leaching losses below the rooting depth increased with increasing rate of N application and the amount of water drained, and accounted for 1 to 16% of applied fertilizer N.