Influence of fusarium oxysporum age on proportions of C, N and P mineralized after chloroform fumigation in soil

Ross, D. J.; Sparling, G.P.; West, AW

doi:10.1071/sr9870563

Cited by 10 publications

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“…The greater P,-flush from those soils incubated for 10 days with phosphate, and the increased Pi-flush from those soils given larger amounts of phosphate can be attributed to the increased plant growth, giving an increased carbon input and hence larger microbial plant growth in these treatments. The Pi-flush normally comprises 30-50% of the microbial-P (Brookes et al, 1982;Ross et al, 1987). It can thus be calculated that on the Kerikeri soil the microbial uptake of P was greater than that of clover, and was similar to that of clover on other soils.…”

Section: Microbial Biomass Phosphatementioning

confidence: 99%

Loss of availability of phosphate in New Zealand soils

Parfitt

Hume

Sparling

1989

Journal of Soil Science

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Phosphate sorption was measured by the method of Barrow (1980) using a laboratory incubation procedure for up to 60 d on four soils which had different mineralogies but medium to high phosphate retention. All the soils had slow reactions where phosphate sorption continued, but at a decreasing rate, with time. The rate of decrease in the slow reactions was similar on all the soils. Phosphate became less available to plants during the slow reactions, and results of a pot trial with white clover showed that, on all the soils, phosphate incubated with the soils for 218 d was about 65% as effective as phosphate incubated for 10 d.When 700 mg P kg-' was added to allophanic soils (Andisols), about 100 mg kg-l was strongly adsorbed, about 200 mg kg-I became unavailable in about 200 days and the remainder was weakly adsorbed. A similar result was obtained on Waiarikiki soil (Inceptisol), which contained ferrihydrite and Al-humus as the predominant reactive species. On the Kerikeri soil (Oxisol) about 150 mg P kg-' became unavailable with time as a result of reactions with geothite, hematite and Al-humus.The phosphate uptake by the microbial biomass was similar to the uptake by the clover, and immobilization of phosphate in the biomass can contribute to the loss of availability of phosphate in soils.

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Section: Microbial Biomass Phosphatementioning

confidence: 99%