Publication Date
1993
Description
The results of a long-term grazed, border dyke-irrigated trial studying the effects of annual maintenance rates of superphosphate (0, 188 and 376 kg/ha) for 40 years are outlined and discussed. Superphosphate applications increased pasture dry matter yields and this was attributed to a response to both added P and S. There was a build-up of soil organic matter over the duration of the experiment which was greater for the superphosphate treatments than control. Grazing sheep caused a redistribution of nutrients across experimental plots due to their behaviour of camping on the raised level areas of the plots. A balance sheet of nutrient inputs and outputs showed that only 51-59% of applied P and 15-35% of applied S were retained in the soil. Ma;or losses were attributed to runoff of P and Sas particulate matter during flood irrigation and leaching of sulphate mainly during irrigation.
Citation
Haynes, R J. and Williams, P H., "An Overview of Pasture Response, Nutrient Turnover and Nutrient Accumulation on the Grazed, Long-Term Superphosphate Trial at Winchmore, New Zealand" (2024). IGC Proceedings (1993-2023). 10.
https://uknowledge.uky.edu/igc/1993/session40/10
Included in
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An Overview of Pasture Response, Nutrient Turnover and Nutrient Accumulation on the Grazed, Long-Term Superphosphate Trial at Winchmore, New Zealand
The results of a long-term grazed, border dyke-irrigated trial studying the effects of annual maintenance rates of superphosphate (0, 188 and 376 kg/ha) for 40 years are outlined and discussed. Superphosphate applications increased pasture dry matter yields and this was attributed to a response to both added P and S. There was a build-up of soil organic matter over the duration of the experiment which was greater for the superphosphate treatments than control. Grazing sheep caused a redistribution of nutrients across experimental plots due to their behaviour of camping on the raised level areas of the plots. A balance sheet of nutrient inputs and outputs showed that only 51-59% of applied P and 15-35% of applied S were retained in the soil. Ma;or losses were attributed to runoff of P and Sas particulate matter during flood irrigation and leaching of sulphate mainly during irrigation.
