The reaction between phosphate and dry soil. II. The effect of time, temperature and moisture status during incubation on the amount of plant available P

R. G.V. BRAMLEY, N. J. BARROW

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Abstract

Subterranean clover was grown in pots in which the only source of phosphate (P) was from bands of soil which had been incubated with P for a range of times, and at different temperatures, when either moist or air‐dry. The effectiveness of these incubated soils in supplying P to plants decreased with time of incubation. Effectiveness decreased after air‐dry incubation, though not as quickly as after moist incubation. These results indicate that air‐dry storage of soil samples is to be avoided if the samples are to be assessed for their ability to supply P to growing plants. They also indicate that the cost‐saving to Australian farmers, derived from applying phosphate prior to the start of the growing season, may be balanced or even outweighed by a loss in fertilizer effectiveness due to the reaction between P and the soil in the weeks prior to germination of seed.

Original languageEnglish
Pages (from-to)759-766
Number of pages8
JournalJournal of Soil Science
Volume43
Issue number4
DOIs
Publication statusPublished - 1 Jan 1992

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