A two-year investigation was conducted on 8-replicate plots located 30 miles East of lake Michigan on sandy to sandy-loamy soil, using 1.8 m-deep lysimeters (4.8 m3 of volume) installed with minima disturbance of the soil profile and containing a bearing (2-3 year-old) apple tree each. The aims of this research were to study the movement (rate and speed) of nitrate-nitrogen (NO3- -N) through the soil profile and to evaluate the amount of nitrate-N collected by lysimeters. Nitrate-N concentration in the water collected by the lysimeters ranged from less than 10 mg L-1 (in late summer) to over 40 mg L-1 (in winter). From these values and from the volume of water collected by the lysimeters it was calculated an annual amount of N lost at 1.8 m of depth of 52 and 141 kg ha-1, in the two years of investigation. The difference between the two years were mainly explained by the rainfalls, since the daily rate of nitrate-N leaching was linearly related to the daily rate of water leaching. The application of labelled N ammonium nitrate as fertilizer increased the concentration of nitrate-N in the solution collected by soil suction tubes (SST). Labelled N was found in the water collected from the lysimeter 3 months after its application. The NO3- -N concentration of SST was correlated significantly with nitrate-N concentration of lysimeter only when the time of movement was considered.

Evaluation of nitrate-N leaching from lysimeter-grown bearing apple trees

TOSELLI, MORENO;FLORE, JAMES ALBERT
2011

Abstract

A two-year investigation was conducted on 8-replicate plots located 30 miles East of lake Michigan on sandy to sandy-loamy soil, using 1.8 m-deep lysimeters (4.8 m3 of volume) installed with minima disturbance of the soil profile and containing a bearing (2-3 year-old) apple tree each. The aims of this research were to study the movement (rate and speed) of nitrate-nitrogen (NO3- -N) through the soil profile and to evaluate the amount of nitrate-N collected by lysimeters. Nitrate-N concentration in the water collected by the lysimeters ranged from less than 10 mg L-1 (in late summer) to over 40 mg L-1 (in winter). From these values and from the volume of water collected by the lysimeters it was calculated an annual amount of N lost at 1.8 m of depth of 52 and 141 kg ha-1, in the two years of investigation. The difference between the two years were mainly explained by the rainfalls, since the daily rate of nitrate-N leaching was linearly related to the daily rate of water leaching. The application of labelled N ammonium nitrate as fertilizer increased the concentration of nitrate-N in the solution collected by soil suction tubes (SST). Labelled N was found in the water collected from the lysimeter 3 months after its application. The NO3- -N concentration of SST was correlated significantly with nitrate-N concentration of lysimeter only when the time of movement was considered.
M. TOSELLI; R. L. PERRY; J. A. FLORE
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11585/107759
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