dc.contributor.advisor |
Kutu, F. R. |
|
dc.contributor.author |
Chauke, Rhandu
|
|
dc.contributor.other |
Mariga, I. K. |
|
dc.date.accessioned |
2015-03-06T09:40:43Z |
|
dc.date.available |
2015-03-06T09:40:43Z |
|
dc.date.issued |
2014 |
|
dc.identifier.uri |
http://hdl.handle.net/10386/1171 |
|
dc.description |
Thesis (MSc. Agriculture (Soil Science)) -- University of
Limpopo, 2014 |
en_US |
dc.description.abstract |
Phospho-composts of different mix ratios (5:5, 7:3, 8:2 and 9:1) were produced
through thermophilic co-composting of poultry manure (PM) and sewage sludge
(SS) with ground phosphate rock (GPR). Composted PM and SS without GPR
addition were included as control. Cured phospho-composts were chemically
characterised and used for both laboratory incubation and greenhouse studies,
respectively for phosphorus (P) mineralisation and bioavailability, over a period of
42 days. Results revealed that Bray-P1 concentration measured in compost
amended soils at 14, 21 and 42 DAI differed significantly (P<0.05) and ranged
between 5.47 and 11.14 mg kg-1 and between 5.28 and 11.78 mg kg-1 in poultry
manure and sewage sludge-based phospho-composts, respectively. The maximum
amount of cumulative P mineralised of 16.06 and 9.98 mg kg -1, respectively in PM
and SS-based phospho-composts were obtained from the 8:2 mix ratio. The
content of the acid detergent fibre of the different phospho-composts showed
positive and significant correlation with cellulose, lignin and total organic carbon
(TOC). Similarly, cellulose as well as C:P ratio showed significant correlation with
both lignin and TOC. The polynomial relationship between cumulative P mineralised
and the various GRP and manure mix ratios revealed significant and positive R2-
values of 0.731 and 0.613 for PM and SS-based phospho-composts, respectively.
The maximum amount of maize tissue P uptake of 0.12 and 0.11 mg pot-1 in PM and
SS-based phospho-compost respectively were also obtained from the 8:2 mix ratio
while the least amount of 0.04 mg P pot-1 was obtained from GPR and unamended
pots. Maize tissue P uptake following the phospho-compost application was
significantly affected by the differences in soil type. Tissue P uptake was 0.06 and
0.11 mg P/pot, respectively in low potential and high potential soils with a
significantly higher value. The use of the different phospho-composts showed great
potential for amelioration of P-deficiency problems in crops while thermophilic cocomposting
improved the solubility and bioavailability of P from non-reactive GPR.
Keywords: Ground phosphate rock; poultry manure; sewage sludge; phosphocomposts;
phosphorus mineralisation; soil fertility management. |
en_US |
dc.format.extent |
xi, 58 leaves : col. ill. |
en_US |
dc.language.iso |
en |
en_US |
dc.publisher |
University of Limpopo (Turfloop Campus) |
en_US |
dc.relation.requires |
Adobe Acrobat Reader, version 6 |
en_US |
dc.subject |
Phosphorus composts |
en_US |
dc.subject |
Poultry manure |
en_US |
dc.subject.lcsh |
Phosphorus -- Bioavailability |
en_US |
dc.subject.lcsh |
Phosphorus in agriculture |
en_US |
dc.subject.lcsh |
Poultry -- Manure |
en_US |
dc.subject.lcsh |
Sewage sludge as fertilizer |
en_US |
dc.title |
Mineralisation and bioavailability of phosphorus from poultry manure and sewage sludge-based phospho-composts for maize production |
en_US |
dc.type |
Thesis |
en_US |