Abstract
Agricultural land use in the Mekong Delta of Vietnam is dominated by intensive irrigated rice cropping systems on both alluvial and acid sulfate soils.A stagnating and occasionally declining productivity may be linked on the alluvial soils to low N use efficiency and low soil organic matter content while on acid sulfate soils to acidity, Al toxicity and P deficiency.For economic reasons, farmers increasingly diversify their cropping system by replacing the dry season rice by high-value horticultural crops grown under upland conditions.However, upland cropping is likely to further exacerbate the soil-related problems.Organic substrates from decentralized waste and waste water management are widely available and may help to alleviate the reported soil problems.During the dry season of 2003/2004, the effect of the application of various types and rates of locally available waste products on crop performance was evaluated at both an alluvial and an acid sulfate soil site.The C and N mineralization dynamics of nine organic substrates from waste and waste water treatment were determined by anaerobic (N) and aerobic (C) incubation in the laboratory.The response of 12 week-old mungbean (dry matter accumulation) to substrate application (1.5 -6.0 Mg ha -1 ) was evaluated on a degraded alluvial and on an acid sulfate soil.In the alluvial soil, largest mineralization rates were observed from anaerobic sludge.Biomass increases in 12 week-old mungbean ranged from 25-98% above the unfertilized control.In the acid sulfate soil, highest net-N release rates were observed from aerobic composts with high P content.Mungbean biomass was related to soil pH and exchangeable Al 3+ and was highest with the application of aerobic composts.We conclude that the use of organic substrates in the rice-based systems of the Mekong Delta needs to be soil specific.
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Claims 6
Claim · model-written summary
In the alluvial soil, the largest mineralization rates came from anaerobic sludge.
Not reportedTaxon
Verbatim
e0“In the alluvial soil, largest mineralization rates were observed from anaerobic sludge”
Claim · model-written summary
Organic substrate application increased 12 week-old mungbean biomass by 25-98% above the unfertilized control on a degraded alluvial soil.
- Taxon
- mungbean
.jpg?width=60)
Vigna radiatae1 - Treatment
- substrate applicatione2
- Outcome
- biomasse1
- Direction
- increasese1
- Value
- 25-98%e1
- Comparator
- unfertilized controle1
- Setting
- degraded alluviale2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e1“Biomass increases in 12 week-old mungbean ranged from 25-98% above the unfertilized control”
e2“The response of 12 week-old mungbean (dry matter accumulation) to substrate application (1.5 -6.0 Mg ha -1 ) was evaluated on a degraded alluvial and on an acid sulfate soil”
Claim · model-written summary
In the acid sulfate soil, the highest net-N release rates came from aerobic composts with high P content.
Not reportedTaxon
Verbatim
e3“In the acid sulfate soil, highest net-N release rates were observed from aerobic composts with high P content”
Claim · model-written summary
Mungbean biomass was related to soil pH and exchangeable Al3+.
- Taxon
- MungbeanVigna radiatae4
- Compound
- exchangeable Al 3+e4
- Outcome
- biomasse4
- Qualifier
- soil pHe4
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“Mungbean biomass was related to soil pH and exchangeable Al 3+ and was highest with the application of aerobic composts”
Claim · model-written summary
Mungbean biomass was highest with the application of aerobic composts.
- Taxon
- MungbeanVigna radiatae4
- Treatment
- application of aerobic compostse4
- Outcome
- biomasse4
- Direction
- higheste4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“Mungbean biomass was related to soil pH and exchangeable Al 3+ and was highest with the application of aerobic composts”
Claim · model-written summary
The authors conclude that the use of organic substrates in rice-based systems of the Mekong Delta needs to be soil specific.
- Taxon
- rice
Oryza sativae5 - Outcome
- use of organic substratese5
- Qualifier
- soil specifice5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“We conclude that the use of organic substrates in the rice-based systems of the Mekong Delta needs to be soil specific”
The same questions in other papers
fertilization · growth · Vigna radiata (mung bean)Positive and negative results
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- no effect
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See all 145 papers →growing medium · growth · Vigna radiata (mung bean)Results agree
4 papers in the same direction as this paper
- positive
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See all 5 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.