Discussion of Paper of P. W. Wilson and Orville Wyss

Johnstone-Wallace, D. B.

doi:10.2136/sssaj1938.036159950002000c0047x

Soil Science Soc of Amer J

1938

DOI: 10.2136/sssaj1938.036159950002000c0047x

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Discussion of Paper of P. W. Wilson and Orville Wyss

D. B. Johnstone-Wallace

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1956

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The nitrogen cycle in grassland soils

Walker¹

1956

J Sci Food Agric

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We now have a fairly complete picture of the nitrogen cycle in grassland soils and the relevant features are discussed.The large amounts of nitrogen needed to obtain high production from pastures are derived initially almost entirely from nitrogen-fixation by clovers in New Zealand, where under some of the better conditions clovers may fix about 600 lb. of nitrogen per acre per year. The associated grasses derive their nitrogen from soil organic matter, underground transference from clovers, and from excreted nitrogen when a pasture is grazed. With appropriate management and proper nutrition, clover production can be maintained and the organic matter content of soils may increase rapidly t o high levels. The various ways in which nitrogen may be lost from the cycle, and gaps in our knowledge are indicated.The tremendous influence of the clover-grass-animal association on the organic cycle is discussed, and if the C : N : organic S : organic P ratio in soils is assumed to remain fairly constant, it is clear that sulphur and phosphorus may be two most important nutrients during the phase of accumulation of organic matter under pastures where clovers are being relied upon as the main source of nitrogen.

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The nitrogen cycle in grassland soils

Walker¹

1956

J Sci Food Agric

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The acquisition of phosphorus byLupinus albus L.

Gardner

Boundy²

1983

Plant Soil

140

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Discussion of Paper of P. W. Wilson and Orville Wyss

Cited by 2 publications

References 0 publications

The nitrogen cycle in grassland soils

The nitrogen cycle in grassland soils

The acquisition of phosphorus byLupinus albus L.

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