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Comparative soil phosphorus requirements of four field crops

Dwyer, J.C. and Moody, P.W. (1988) Comparative soil phosphorus requirements of four field crops. Queensland Journal of Agricultural and Animal Sciences, 45 (2). pp. 123-128.



A range of soil phosphorus levels was established at one site on a euchrozem near Kingaroy in south-east Queensland, by dispersing rates of triple superphosphate (0-480 kg P/ha) through the 0-100 mm layer. Following two cover crops to allow equilibrium between fertiliser and soil, successive crops of barley, soybean, sorghum and peanut were grown. For each plot and each crop, Mitscherlich equations were fitted to relative seed yield versus extractable soil phosphorus levels determined on soil samples taken prior to planting. Bicarbonate extractable P levels corresponding to 90% maximum seed yield for sorghum, barley, soybean and peanut were 34, 29, 18 and 10 mg/kg respectively. Relative seed yields at the low bicarbonate extractable P levels (6-8 mg/kg) of the nil applied phosphorus plots decreased in the order: peanut > > soybean > sorghum > barley. In terms of increasing ability to utilise banded phosphorus fertiliser, the crops ranked: peanut < soybean < sorghum <barley.

Item Type:Article
Corporate Creators:Department of Agriculture and Fisheries, Queensland
Subjects:Agriculture > Agriculture (General) > Fertilisers
Plant culture > Field crops
Plant culture > Field crops > Barley
Plant culture > Field crops > Sorghum
Plant culture > Field crops > Other field crops
Live Archive:15 Apr 2024 05:19
Last Modified:15 Apr 2024 05:19

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