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Nutrient cycling and losses based on a mass-balance model in grazed pastures receiving long-term superphosphate applications in New Zealand: 1. Phosphorus

Published online by Cambridge University Press:  27 March 2009

M. L. Nguyen  and
K. M. Goh
M. L. Nguyen
Affiliation:
Department of Soil Science, Lincoln University, Canterbury, New Zealand
K. M. Goh
Affiliation:
Department of Soil Science, Lincoln University, Canterbury, New Zealand
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Summary

Phosphorus (P) cycling and losses in irrigated, sheep-grazed pastures receiving superphosphate (SP) applications for 35 years at annual rates of 0, 188 and 376 kg/ha were studied using a massbalance approach which accounted both for P inputs to and outputs from the soil-plant-animal system. Total recoveries of applied P in the soil-plant-animal systems in the 188 and 376 kg SP/ha treatments were 94 and 83% respectively. Approximately 52–53% of the applied P was recovered in the soil within the major plant rooting zone (0–300 mm soil depth). These data suggest that P leaching losses from SP fertilizer, plant litter, root residue and sheep faeces were unlikely to occur beyond the major plant rooting zone. However, the transfer of excretal P to stock camps and the transport of P from SP fertilizer, plant litter and sheep faeces via the irrigation water along the border from the top to the bottom of the irrigated border strip accounted for less than 6% of the applied P. Superphosphate applications resulted in the accumulation of both soil inorganic and organic P fractions to a depth of 225 mm. The accumulation of soil inorganic P was most pronounced when SP was applied annually at the rate of 376 kg/ha, which was in excess of pasture P requirements.

Type
Crops and Soils
Information
The Journal of Agricultural Science , Volume 119 , Issue 1 , August 1992 , pp. 89 - 109
Copyright
Copyright © Cambridge University Press 1992

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