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Nitrogen Movement Comparisons in Cropped versus Fallowed Soils¹

The movement and accumulation patterns of N, applied as KNO₃ to cropped and fallowed plots, were studied on two widely different soils, Marlboro and Davidson. Generally, the movement and accumulation patterns indicated movement of N to a greater depth and extent on the cropped than on fallowed plots. Nitrogen movement in the Marlboro surface and subsoil was considerably greater than in Davidson soil. Even with excessive rainfall, most of the N recovered 11 to 12 months after application was concentrated between the 46 to 122-cm depths with the largest accumulation occurring in the 61 to 91-cm layer. After 10 weeks and 29 on1 of rainfall, 78% of the applied N was recovered on the fallowed Davidson soil while after 50 weeks and 154 cm of rainfall 53% was recovered. Comparable recoveries for the cropped plots were 89 and 49% respectively. After 5 weeks and 12 cm rainfall, the recovery on the fallowed plots of the Marlboro soil was 109% but had decreased to 33% after 46 weeks and 124 cm of accumulated rainfall. Data for cropped plots indicated 119 and 25% recovery for the respective sampling periods. Recovery increased approximately 5 to 10% on the cropped plots when the plant N uptake values were included.

Key Words: Leaching • Clay content • Nitrogen accumulation • Crop uptake

² Associate Professor of Soil Chemistry and Professor of Soil Science, respectively, Georgia Station, Experiment, Ga. 30212. The authors wish to express their appreciation to O. L. Brooks and Charles Perry, Southeast Ga. Station, Midville, for their cooperation in this study.

Received for publication November 29, 1969.