Abstract
Abstract. 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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Claims 13
Claim · model-written summary
Rock phosphate amended soil had 6.0–11.5 mg kg−1 P mineralization.
Verbatim
e0“P mineralization in soil amended with RP was 6.0–11.5 mg kg−1”
t0“chilli ( Capsicum annuum L.)”
Claim · model-written summary
Soluble P fertilizers produced 68–73 mg P kg−1 at day 0.
Not reportedComparatorDirection
Verbatim
e0“both soluble P fertilizers resulted in 68–73 mg P kg−1 at day 0”
t0“chilli ( Capsicum annuum L.)”
e2“P mineralization in soil amended with RP”
Claim · model-written summary
Mineralized P under soluble fertilizers decreased 79–82% by incubation end.
Verbatim
e0“decreased by 79–82 % at the end of incubation”
e1“both soluble P fertilizers”
t0“chilli ( Capsicum annuum L.)”
e3“P mineralization in soil amended with RP”
Claim · model-written summary
T11 with PSB and manure released a maximum of 25 mg P kg−1 without loss.
- Taxon
- chillit0
- Treatment
- PSB and PM with RP in T11e0
- Outcome
- P mineralizatione0
- Direction
- stimulatede0
- Value
- 25 mg P kg−1e0
Not reportedComparator
Verbatim
e0“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”
t0“chilli ( Capsicum annuum L.)”
Claim · model-written summary
PSB reduced soil pH.
Not reportedComparator
Verbatim
e0“Use of PSB decreased soil pH”
t0“chilli ( Capsicum annuum L.)”
Claim · model-written summary
Rock phosphate alone had no significant impact on chilli growth.
Not reportedComparatorDirection
Verbatim
e0“RP alone or RP+PSB did not have a significant impact on plant growth”
t0“chilli ( Capsicum annuum L.)”
Claim · model-written summary
Rock phosphate plus PSB had no significant impact on chilli growth.
Not reportedComparatorDirection
Verbatim
e0“RP alone or RP+PSB did not have a significant impact on plant growth”
t0“chilli ( Capsicum annuum L.)”
Claim · model-written summary
Combined RP, manure and PSB gave chilli growth similar to DAP.
Verbatim
e0“combined use of RP, PM and PSB in T11 resulted in similar growth, yield and P uptake of chilli as DAP”
Claim · model-written summary
Combined RP, manure and PSB gave chilli yield similar to DAP.
Verbatim
e0“combined use of RP, PM and PSB in T11 resulted in similar growth, yield and P uptake of chilli as DAP”
Claim · model-written summary
Combined RP, manure and PSB gave chilli P uptake similar to DAP.
Verbatim
e0“combined use of RP, PM and PSB in T11 resulted in similar growth, yield and P uptake of chilli as DAP”
Claim · model-written summary
P utilization efficiency ranged from 4 to 29%.
Verbatim
e0“PUE of applied P varied from 4 to 29 %”
t0“chilli ( Capsicum annuum L.)”
Claim · model-written summary
P utilization efficiency was higher with PSB treatments.
Verbatim
e0“PUE of applied P varied from 4 to 29 % and was higher in the treatments that included PSB”
t0“chilli ( Capsicum annuum L.)”
Claim · model-written summary
The authors propose PSB and manure with rock phosphate or soluble fertilizers to enhance P availability for crop production.
Verbatim
e0“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”
t0“chilli ( Capsicum annuum L.)”
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