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| Titel |
Mineralization of soluble P fertilizers and insoluble rock phosphate in response to phosphate-solubilizing bacteria and poultry manure and their effect on the growth and P utilization efficiency of chilli (Capsicum annuum L.) |
| VerfasserIn |
M. K. Abbasi, N. Musa, M. Manzoor |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 12, no. 15 ; Nr. 12, no. 15 (2015-08-05), S.4607-4619 |
| Datensatznummer |
250118048
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| Publikation (Nr.) |
 copernicus.org/bg-12-4607-2015.pdf |
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| Zusammenfassung |
| The ability of soil microorganisms and organic manure to convert insoluble
phosphorus (P) to an accessible form offers a biological rescue system for
improving P utilization efficiency in soil–plant systems. Our objective was
to examine the P mineralization potential of two soluble P fertilizers (SPF),
i.e., single superphosphate (SSP) and diammonium phosphate (DAP), and of
insoluble rock phosphate (RP) with and without phosphate-solubilizing
bacteria (PSB) and poultry manure (PM) and their subsequent effect on the
growth, yield and P utilization efficiency (PUE) of chilli (Capsicum
annuum L.). An incubation study was carried out on a loam (slightly
alkaline) soil with 12 treatments: T0 – control; T1 – RP; T2
– SSP; T3 – DAP; T4 – PM; T5 – 1/2 RP+1/2 SSP;
T6 – 1/2 RP+1/2 DAP; T7 – 1/2 RP+1/2 PM; T8 –
RP+PSB; T9 – 1/2 RP+1/2 SSP+PSB; T10 – 1/2 RP+1/2
DAP+PSB; and T11 – 1/2 RP+1/2 PM+PSB. Phosphorus mineralization
was measured by analyzing extractable P from the amended soil incubated under
controlled conditions at 25 °C for periods of 0, 5, 15, 25, 35 and
60 days. A complementary greenhouse experiment was conducted in pots with
chilli (Capsicum annuum L.) as a test crop. Growth, yield, P uptake
and PUE of the chilli was determined during the study. Results indicated that
P mineralization in soil amended with RP was 6.0–11.5 mg kg−1, while
both soluble P fertilizers resulted in 68–73 mg P kg−1 at day 0,
which decreased by 79–82 % at the end of incubation. The integrated use
of PSB and PM with RP in T11 stimulated P mineralization by releasing
a maximum of 25 mg P kg−1 that was maintained at high levels without
any loss. Use of PSB decreased soil pH. In the greenhouse experiment, RP
alone or RP+PSB did not have a significant impact on plant growth. However,
the combined use of RP, PM and PSB in T11 resulted in similar growth,
yield and P uptake of chilli as DAP. The PUE of applied P varied from 4 to
29 % and was higher in the treatments that included PSB. We conclude that
the use of PSB and PM with insoluble RP or with soluble P fertilizers could
be a promising approach to enhance P availability from both low-grade RP and
SPF for crop production in intensive cropping systems. |
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