Renovation of phalaris pastures with special reference to nitrogen and sulphur relationships

Research output: Contribution to journalArticle

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Abstract

Renovation of phalaris (Phalaris tuberosa L.) pastures by mouldboard ploughing resulted in an increased yield of phalaris but a decreased yield of other species. Only at one of three sites was there a net increase in yield. The increased yield of phalaris may have been due to its greater ability to survive the fairly drastic ploughing treatment. The phalaris then had a competitive advantage when the pasture grew again. From data for soil ionic nitrogen, plant response to nitrogen and sulphur, and chemical analysis of plant material, it was concluded that the increase in yield was due to greater availability of nitrogen and sulphur, indicating accelerated breakdown of organic matter. This effect was considered to be due to the temporary prevention of plant growth, since the continual removal of ionic nitrogen by plants would tend to reduce the nitrogen available to microorganisms, thus widening the carbon: Nitrogen ratio. A similar competition for sulphur may also be important. Recurring sulphur deficiency due to infrequent applications of fertilizer may be important in the decline of pastures on sulphur-deficient soils. The clover fraction would be particularly affected since grasses are considered to compete strongly with clovers for sulphate. The data for ionic nitrogen in soil showed that high exchangeable ammonium occurred during the winter months.

Original languageEnglish
Pages (from-to)617-634
Number of pages18
JournalAustralian Journal of Agricultural Research
Volume8
Issue number6
DOIs
Publication statusPublished - 1 Jan 1957

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Phalaris
Sulfur
sulfur
Nitrogen
pastures
nitrogen
Medicago
plowing
Soil
Phalaris aquatica
soil
chemical analysis
carbon nitrogen ratio
Fertilizers
plant response
Poaceae
Ammonium Compounds
sulfates
fertilizer application
Sulfates

Cite this

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title = "Renovation of phalaris pastures with special reference to nitrogen and sulphur relationships",
abstract = "Renovation of phalaris (Phalaris tuberosa L.) pastures by mouldboard ploughing resulted in an increased yield of phalaris but a decreased yield of other species. Only at one of three sites was there a net increase in yield. The increased yield of phalaris may have been due to its greater ability to survive the fairly drastic ploughing treatment. The phalaris then had a competitive advantage when the pasture grew again. From data for soil ionic nitrogen, plant response to nitrogen and sulphur, and chemical analysis of plant material, it was concluded that the increase in yield was due to greater availability of nitrogen and sulphur, indicating accelerated breakdown of organic matter. This effect was considered to be due to the temporary prevention of plant growth, since the continual removal of ionic nitrogen by plants would tend to reduce the nitrogen available to microorganisms, thus widening the carbon: Nitrogen ratio. A similar competition for sulphur may also be important. Recurring sulphur deficiency due to infrequent applications of fertilizer may be important in the decline of pastures on sulphur-deficient soils. The clover fraction would be particularly affected since grasses are considered to compete strongly with clovers for sulphate. The data for ionic nitrogen in soil showed that high exchangeable ammonium occurred during the winter months.",
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Renovation of phalaris pastures with special reference to nitrogen and sulphur relationships. / Barrow, N. J.

In: Australian Journal of Agricultural Research, Vol. 8, No. 6, 01.01.1957, p. 617-634.

Research output: Contribution to journalArticle

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