EFFECT OF PLACEMENT AND CONCENTRATION OF APPLIED NH4+-N ON NITROGEN LOSS FROM FLOODED SOIL

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Abstract
The effect of placement and concentration of NH4+-N in a flooded soil on nitrogen (N) loss was investigated under laboratory conditions. Applied 15NH4+-N was rapidly loss from the soil system during a 4-month incubation period regardless of where NH4+-N was applied in the soil column. Nitrogen loss was lower when N was placed in the anaerobic zone than when placed at the aerobic surface. Addition of rice straw decreased N loss where N was applied to the soil, but did not show any difference where N was applied to the overlying floodwater. Increasing the concentration of NH4+-N in the soil increased the N loss and also the thickness of the aerobic soil layer. Measurement of N distribution in the soil column showed that increasing the amount of NH4+-N applied in the anaerobic soil layer increased the accumulation of NO3--N in the aerobic layer; however, the total accumulation of NO3--N was very little as compared to the NH4+-N disappearance.

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