Abstract
This study investigated the availability of phosphorus (P) following soil application of a novel biosolids-derived organomineral fertilizer (OMF15; 15:4:4) in comparison with single superphosphate (0:18:0). Two soil types of contrasting characteristics were incubated over a period of 90 days at 25 °C and maintained near field capacity. Phosphorus was applied at rates equivalent to 0 (control), 150, and 300 kg ha−1 of P2O5, respectively. Availability of P from OMF15 was low throughout the experiment accounting for less than 6.5% of total OMF15-P applied. It was shown that after the 90 days incubation period, the overall increase in soil extractable P in OMF15-treated soil was marginal in both soil types. For single superphosphate (SSP), P availability ranged from 16% to 46% of total SSP-P applied. Application of SSP increased soil extractable P levels significantly (P < 0.001) compared with unfertilized control soils. The results of this study aided the development of fertilization strategies for the best use of OMF produced from nutrient-enriched biosolids granules for applications in winter cereal and grass crops in England.
Highlights
This article, the second in a series of two, reports the results of a laboratory investigation into the availability of phosphorus (P) following soil application of a novel biosolidsderived organomineral fertilizer (OMF) known as OMF15 (15:4:4) (Antille et al 2013a)
The fertilizer type effect was mainly due to the use of single superphosphate (SSP) since increases in soil extractable P levels observed in OMF15-treated soils were marginal compared with controls, and they appeared to be nonsignificant based on the calculated least significant differences (LSD) values
Phosphorus availability from OMF15 was low throughout the experiment, accounting for less than 6.5% relative to total P applied as fertilizer, and between 2.5% and 12% relative to that of single superphosphate P
Summary
This article, the second in a series of two, reports the results of a laboratory investigation into the availability of phosphorus (P) following soil application of a novel biosolidsderived organomineral fertilizer (OMF) known as OMF15 (15:4:4) (Antille et al 2013a). Understanding the availability of P from organic-based fertilizers applied to soil is an important agronomic and environmental consideration for nutrient management This requires matching the timing of phosphorus applications with crop demand to enhance P uptake by crops, replenish offtake, and reduce unnecessary build-up of soil P (Oladeji et al 2008). Antille et al (2013a) emphasized that OMF15 may be applied to soils that have satisfactory soil P status, as specified in current agronomic guidelines (DEFRA 2010), but provided crop requirements for P are not exceeded This criterion for P fertilization is supported by the need to ensure the maintenance of sufficient nutrient reserves in the soil (Dawson 2011) and due to the associated effects (interaction) of soil P availability on the use efficiency of other nutrients, notably, nitrogen (Mouat and Nes 1983)
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