Publication Date
1993
Description
A field plot trial was conducted on irrigated pasture of a Templeton silt loam soil (Udic Ustochrept) by applying 3Ssulphur (358)-labelled urine (250 µCi/g S with 1300 µSimi urine) to field plots (600x600 mm) at a rate normally occurring in sheep urine patches (150 ml in 0.03 m1). Results showed that 27 days after urine application, approximately 55- 90% of 35S-labelled urine was incorporated into soil sulphate (SO4)-S, ester SO 4-S and carbon-bonded S fractions within the major rooting zone (0-300 mm), Labelled-S was found to a soil depth of 500 cm during a 271-day period, showing that these S fractions from soils and/ or 3SS-labelled urine were leached beyond the major rooting zone. Estimated leaching loss of applied urinary S (68%) beyond a 300 mm soil depth over a 271-day period was comparable to that (75%) predicted using the S model of the New Zealand Ministry of Agriculture and Fisheries. Lower amounts of labelled-S were found beyond the 300 mm soil depth when urinary S was applied to the soil al 25% available water-holding capacity (AWHC) than at field capacity. Varying the amount of irrigation water applied 7 days after urine application to soils al 50% or 75% A WHC did not affect recovery of labelled-S in herbage, roots and soil (0-300 mm).
Citation
Nguyen, M L. and Goh, K M., "Pasture Sulphur Recovery and Transformations of Sheep Urinary Sulphur in Irrigated Soils of Canterbury, New Zealand" (2024). IGC Proceedings (1993-2023). 12.
https://uknowledge.uky.edu/igc/1993/session40/12
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Pasture Sulphur Recovery and Transformations of Sheep Urinary Sulphur in Irrigated Soils of Canterbury, New Zealand
A field plot trial was conducted on irrigated pasture of a Templeton silt loam soil (Udic Ustochrept) by applying 3Ssulphur (358)-labelled urine (250 µCi/g S with 1300 µSimi urine) to field plots (600x600 mm) at a rate normally occurring in sheep urine patches (150 ml in 0.03 m1). Results showed that 27 days after urine application, approximately 55- 90% of 35S-labelled urine was incorporated into soil sulphate (SO4)-S, ester SO 4-S and carbon-bonded S fractions within the major rooting zone (0-300 mm), Labelled-S was found to a soil depth of 500 cm during a 271-day period, showing that these S fractions from soils and/ or 3SS-labelled urine were leached beyond the major rooting zone. Estimated leaching loss of applied urinary S (68%) beyond a 300 mm soil depth over a 271-day period was comparable to that (75%) predicted using the S model of the New Zealand Ministry of Agriculture and Fisheries. Lower amounts of labelled-S were found beyond the 300 mm soil depth when urinary S was applied to the soil al 25% available water-holding capacity (AWHC) than at field capacity. Varying the amount of irrigation water applied 7 days after urine application to soils al 50% or 75% A WHC did not affect recovery of labelled-S in herbage, roots and soil (0-300 mm).
