Seasonal and fertiliser effects on microbial phosphorus and nitrogen in soils under pasture

Authors

  • K.W. Perrott
  • S.U. Sarathchandra

DOI:

https://doi.org/10.33584/jnzg.1990.52.1946

Abstract

Significant quantities of phosphorus (P) and nitrogen (N) are present in the soil microbes compared with pasture requirements for these nutrients. Seasonal and fertiliser effects on microbial P and N were investigated in a controlled environment (CE) experiment, two field trials and a glasshouse trial. In the CE experiment there was a basic seasonal pattern of storage of P and N by the microbial biomass over "winter" and release of these nutrients in "spring". Climatic variations affected this pattern in the field trials. Withholding fertiliser did not affect soil microbial P and N in the field trials, despite a decline in pasture production of up to 20%. Soil microbial P and N did decline in the glasshouse trial, in which a much larger drop in herbage production (X30%) was induced by nutrient deficiency. Keywords soil microbial biomass, microbial phosphorus, microbial nitrogen, seasonal effects, withholding fertiliser, plant nutrients

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Published

1990-01-01

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Section

Articles

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