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Losses of nitrogen and other plant nutrients to drainage from soil under grass

Published online by Cambridge University Press:  27 March 2009

E. A. Garwood
Affiliation:
The Grassland Research Institute, Hurley, Berkshire
K. C. Tyson
Affiliation:
The Grassland Research Institute, Hurley, Berkshire

Summary

Drainage lysimeters were used to estimate actual transpiration of a perennial ryegrass sward; this is compared with the calculated values for potential transpiration. Losses to drainage of nitrate nitrogen (NO3–-N) under differing levels of application of nitrogen fertilizer were examined. When 250 kg N/ha were applied annually losses of NO3-N were negligible; when 500 kg N/ha were applied up to 142·9 kg N/ha were lost to drainage. Concentration of NO3-N in the leachate with an application of 250 kg N/ha was low (1–5 ppm); with 500 kg N/ha the concentration ranged from 10 to 109 ppm. Losses of NO3–-N were particularly severe during winter following a dry autumn. When drainage occurred during the growing season losses were minimal.

Concentrations and quantities of K, Ca, Mg, Na, P, Cl and S (as sulphate) leached wore also examined.

Type
Research Article
Copyright
Copyright © Cambridge University Press 1973

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