Agronomic and Environmental Impacts of Silicate Fertilizer ......F Application of silicate...
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Agronomic and Environmental Impacts of Silicate Fertilizer Application on Rice Grown in Louisiana Soils Constancio A. Asis Jr. , Brenda S. Tubaña , Manoch Kongchum , and Ronald D. DeLaune 1 Agronomy, Soil, and Plant Physiology Division, Philippine Rice Research Institute, Maligaya, Science City of Muñoz, Nueva Ecija, Philippines 2 School of Plant, Environmental, and Soil Sciences, Louisiana State University AgCenter, Baton Rouge, LA 3 Department of Oceanography & Coastal Sciences, Louisiana State University, Baton Rouge, LA 1 2 2 3 Introduction ! of atmospheric methane [CH ] owing to 4 anaerobic decomposition of organic matter. Irrigated lowland rice fields are major sources !Mitigating CH emissions from irrigated rice 4 fields is very important to reduce its concentration in the atmosphere. Moreover, crop management could be a likely means of mitigating CH emissions. 4 Materials and Methods F Pot experiment was conducted at LSU greenhouse from April to August 2012. Objective To elucidate the effect of varying sources of Si-rich materials on rice growth and CH emission from rice field 4 Results and Discussion F CRH application did not enhance CH production potential under short-term incubation 4 period. F Application of CaSiO slag is a potential mitigation option for CH emission 3 4 from rice. ! Moreover, specific mechanisms responsible for the environmental benefits of Si application are not completely understood. However, effects of applying Si-rice fertilizer on methane emission is still limited. to abiotic and abiotic stresses. It also aids in the growth and nutrient uptake of Si-accumulating crops like rice and sugarcane. Conclusions and Recommendations 0.0 0.5 1.0 1.5 2.0 0 2 5 10 15 20 25 Control 4 t/ha 8 t/ha 0.0 2.0 4.0 6.0 8.0 Control CRH 4t/ha CRH 8 t/ha CST 4 t/ha CST 8 t/ha CCS 4 t/ha CCS 8t/ha LSD=0.05 2 n E s (mg m) Metha e mis ion CH /hr/ 4 Met ne issio ha Em n 2 (m CH /hr/m ) g 4 Fig.3. Application of CRH did not enhance CH production 4 potential of Crowley silt loam, indicating that CRH did not affect methanogenic and methanotrophic bacterial activities despite having high amount of carbon. Days After Incubation Fig. 4 Application of varying rates and sources of Si did not significantly increase tiller number and plant height of CL 261. F Research on the potential of these Si sources should be continued to understand their agronomic and environmental impacts especially in crop production systems requiring large supply of Si. F Gas samples were taken from open top chamber placed over the plant at 10, 20, and 30 minutes after covering the pot. F Methane emission was measured at maximum tillering, early panicle initiation, booting, flowering, and maturity. F Treatments: F Soil type: 1) Perry clay; 2) Crowley silt loam Variety used: CL 261 B. Rate of application: 1) 0 (control) 2) 4 t/ha 3) 8 t/ha A. Si source 1) Carbonized rice hull (CRH) 2) Carbonized sugarcane trash (CST) 3) Commercial calcium silicate (CCS) F Gas samples were analyzed using gas chromatography 2. Covering the plant with upper chamber 1. Putting of base chamber 4. Transferring s l ga samp es in a vial . ll c ing as 3 Co e t g a pe smls r i 5. Dete m ning CH content 4 t g hru as chromatography 0.0 2.0 4.0 6.0 8.0 Crowley silt loam Perry clay Fig. 1. Application of commercial calcium silicate slag significantly reduced methane emission by 17- 22%. This could be attributed by the release of active iron oxide, a source of electron acceptor, eventually resulting in decreased CH emission. 4 Fig. 2. emission CH 4 did not vary sig- nificantly between Perry clay and Crowley silt loam soil. F Application of silicate fertilizer did not affect the growth of rice cv. CL 261. Moreover, CH emission did not vary between Perry clay and Crowley silt 4 loam soils. ! have shown that silicon (Si) can substantially increase tolerance of rice Studies 2 t ne E ss o (mg C / m) Me ha mi in H hr/ 4 Acknowledgment This study was funded by the Norman E. Borlaug International Fellowship Program for Global Research Alliance on Agricultural Greenhouse Gases and Edward C. Levy Co. Source:https://www1.ethz.ch/ibp/research/environ- mentalmicrobiology/research/Wetlands H Plant eight (cm) l Ti ler Number Days After Planting 0 20 40 60 80 20 40 60 Control CRH 4t/ha CRH 8 t/ha CST 4t/ha CST 8t/ha CCS 4 t/ha CCS 8t/ha Perry clay 0 10 20 30 40 50 20 40 60 Control CRH 4t/ha CRH 8 t/ha CST 4t/ha CST 8t/ha CCS 4 t/ha CCS 8t/ha Crowley silt loam Days After Planting 0 10 20 30 40 50 20 40 60 Control CRH 4t/ha CRH 8 t/ha CST 4t/ha CST 8t/ha CCS 4 t/ha CCS 8t/ha Crowley silt loam 0 20 40 60 80 20 40 60 Control CRH 4t/ha CRH 8 t/ha CST 4t/ha CST 8t/ha CCS 4 t/ha CCS 8t/ha Perry clay
Transcript of Agronomic and Environmental Impacts of Silicate Fertilizer ......F Application of silicate...
Agronomic and Environmental Impacts of Silicate Fertilizer Application on Rice Grown in Louisiana Soils
Constancio A. Asis Jr. , Brenda S. Tubaña , Manoch Kongchum , and Ronald D. DeLaune1Agronomy, Soil, and Plant Physiology Division, Philippine Rice Research Institute, Maligaya, Science City of Muñoz, Nueva Ecija, Philippines
2 School of Plant, Environmental, and Soil Sciences, Louisiana State University AgCenter, Baton Rouge, LA3 Department of Oceanography & Coastal Sciences, Louisiana State University, Baton Rouge, LA
1 2 2 3
Introduction!
of atmospheric methane [CH ] owing to 4
anaerobic decomposition of organic matter.
Irrigated lowland rice fields are major sources
!Mitigating CH emissions from irrigated rice 4
fields is very important to reduce its concentration in the atmosphere. Moreover, crop management could be a likely means of mitigating CH emissions. 4
Materials and MethodsF Pot experiment was conducted at LSU greenhouse from April to August 2012.
Objective To elucidate the effect of varying sources of Si-rich materials on rice growth
and CH emission from rice field4
Results and Discussion
F CRH application did not enhance CH production potential under short-term incubation 4
period.
F Application of CaSiO slag is a potential mitigation option for CH emission 3 4
from rice.
!
Moreover, specific mechanisms responsible for the environmental benefits of Si application are not completely understood.
However, effects of applying Si-rice fertilizer on methane emission is still limited.
to abiotic and abiotic stresses. It also aids in the growth and nutrient uptake of Si-accumulating crops like rice and sugarcane.
Conclusions and Recommendations
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1.0
1.5
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0 2 5 10 15 20 25
Control 4 t/ha 8 t/ha
0.0
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8.0
Control CRH 4t/ha
CRH 8 t/ha
CST 4 t/ha
CST 8 t/ha
CCS 4 t/ha
CCS 8t/ha
LSD=0.05
2n
Es
(mg
m
)M
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CH
/h
r/4
Me
tn
e
issio
ha
Em
n
2(m
CH
/h
r/m
)g
4
Fig.3. Application of CRH did not enhance CH production 4
potential of Crowley silt loam, indicating that CRH did not affect methanogenic and methanotrophic bacterial activities despite having high amount of carbon.
Days After Incubation
Fig. 4 Application of varying rates and sources of Si did not significantly increase tiller number and plant height of CL 261.
F Research on the potential of these Si sources should be continued to understand their agronomic and environmental impacts especially in crop production systems requiring large supply of Si.
F Gas samples were taken from open top chamber placed over the plant at 10, 20, and 30 minutes after covering the pot.
F Methane emission was measured at maximum tillering, early panicle initiation, booting, flowering, and maturity.
F Treatments:
F Soil type: 1) Perry clay; 2) Crowley silt loam Variety used: CL 261
B. Rate of application: 1) 0 (control) 2) 4 t/ha 3) 8 t/ha
A. Si source1) Carbonized rice hull (CRH) 2) Carbonized sugarcane trash (CST) 3) Commercial calcium silicate (CCS)
FGas samples were analyzed using gas chromatography
2. Covering the plant with upper chamber
1. Putting of base chamber
4. Transferring s l ga samp es in
a vial. ll c ing as3 Co e t g
a p e s m l s
r i5. Dete m ning CH content 4
t ghru as chromatography
0.0
2.0
4.0
6.0
8.0
Crowley silt loam Perry clay
Fig. 1. Application of commercial calcium silicate slag significantly reduced methane emission by 17-22%. This could be attributed by the release of active iron oxide, a source of electron acceptor, eventually resulting in decreased CH emission. 4
Fig. 2. emission
CH 4
did not vary sig- nificantly between Perry clay and Crowley silt loam soil.
F Application of silicate fertilizer did not affect the growth of rice cv. CL 261. Moreover, CH emission did not vary between Perry clay and Crowley silt 4
loam soils.
! have shown that silicon (Si) can substantially increase tolerance of rice Studies
2t
ne
Ess
o(m
g C
/m
)M
eh
a
mi
in
H
hr/
4
AcknowledgmentThis study was funded by the Norman E. Borlaug International Fellowship Program for Global Research Alliance on Agricultural Greenhouse Gases and Edward C. Levy Co.
Source:https://www1.ethz.ch/ibp/research/environ- mentalmicrobiology/research/Wetlands
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Control
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Days After Planting
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Perry clay
