Soil PH and nitrogen changes following cattle and sheep urine deposition
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Communications in Soil Science and Plant Analysis;28(15-16): 1253-1268
Permanent link to this item: http://hdl.handle.net/10568/32871
The changes in soil pH and mineral N concentrations of cattle and sheep urine patches were compared to those occurring in fertilizer urea placement zones in a study in Niger. Urine and fertilizer solutions each containing 400 mg N (800 kg N/ha) were spread onto individual plots covering a surface area of 4 cm radius. The treatments included a control, which consisted of distilled water. Soil samples from three replicate plots were taken in 4 cm increments to a depth of 16 cm and distance of 16 cm on a grid pattern at days 1, 7, 21, 49, 90, 120, and 150 after application. Significant pH and mineral N gradients developed near fertilizer and urine placement zones, which declined towards the periphery and the deeper soil layers. The pH at the centre of the urine zone remained >7.5 throughout the 150 days of the study period. After the initial increase, the soil pH below the fertilizer placement sites declined to the control level by day 90. Concentrations of ammonium + nitrate also increased markedly in the imme.