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Type: | Journal article |
Title: | Mobilisation of rock phosphate by surface application of compost |
Author: | Verma, S. Penfold, C. Marschner, P. |
Citation: | Biology and Fertility of Soils, 2013; 49(3):287-294 |
Publisher: | Springer-Verlag |
Issue Date: | 2013 |
ISSN: | 0178-2762 1432-0789 |
Statement of Responsibility: | Suman Lata Verma, Chris Penfold, Petra Marschner |
Abstract: | The poor solubility of rock phosphate limits its usefulness for crop production, but it has been shown that combined application of rock phosphate with plant residues can increase its P availability compared to rock phosphate alone. To investigate if compost mulch has a similar effect as residues, the effect of two rock phosphates [Nutriphos Guano Powder (RPA) and Indian Potash Limited (RPB)] with or without two different composts C1 (from garden waste) and C2 (from wood chips and bark), on soil P pools and P uptake by wheat was evaluated in a 75-day glasshouse experiment in a loamy sand soil. The composts were applied as a 2.5-cm-thick layer on the soil surface and rock P was mixed in the soil at a rate of 0.250 g kg⁻¹ soil (equivalent to 35 mg P kg⁻¹ of RPA and 26 mg P kg⁻¹ soil as RPB). Further treatments included an unamended soil and a soil amended with soluble P (KH₂PO₄) at a rate of 50 mg P kg⁻¹ soil. Wheat was sown and harvested after 42 and 75 days. At sampling, the compost layer was removed and the underlying soil was sampled. Soil pH and total organic C concentration were not affected by the amendments. Soil respiration was significantly higher in soil amended with composts with or without rock P compared to unamended and inorganic fertiliser treatments. On day 75, addition of composts alone or with rock P increased plant growth and P uptake by 30–50 % compared to the unamended soil, which was greater increase than with soluble P. Compared with either rock P or compost applied alone, the combination of rock P with compost increased the concentration of NaHCO₃-Pi and microbial P by about 30 %, suggesting that compost increased the mobilisation of rock P. The combination of compost and rock P also changed the concentrations of non-labile P pools compared to rock P alone indicating effects on P flux between the pools. This study showed that surface compost application can increase P mobilisation from rock P, but plant growth and P uptake were not increased compared to compost alone indicating that the composts supplied sufficient P to the plants. |
Keywords: | Compost Inorganic fertilisers Mobilisation P pools |
Rights: | © Springer-Verlag 2012 |
DOI: | 10.1007/s00374-012-0717-y |
Published version: | http://dx.doi.org/10.1007/s00374-012-0717-y |
Appears in Collections: | Agriculture, Food and Wine publications Aurora harvest 4 |
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