Abstract
Field experiments were conducted at the Central Tuber Crops Research Institute, Thiruvananthapuram, Kerala for 5 years during 2004-09 in RBD and 2006-11 in split plot design to assess the comparative agronomic and nutritional advantages of organic management over conventional system in elephant foot yam and yams (Dioscorea spp.), respectively. Organic management resulted in significantly higher yield of 20% (57.10 tonnes/ha) over conventional practice (47.61 tonnes/ha) in elephant foot yam. Organic management also produced significantly higher yield in all the three species of yams (pooled mean of 22.21, 21.96 and 16.83 tonnes/ha for white yam, greater yam and lesser yam respectively). The yield increase observed under organic management in these species was 9%, 11% and 7%, respectively over chemical based farming. Organic management lowered the bulk density by 2.3%, improved the water holding capacity by 28.4% and the porosity of soil by 16.5% in elephant foot yam. There was significant increase in pH (0.46-0.77 unit increase) apart from higher organic C (by 15-19%), available N, P and K, bacterial and fungal populations, N fixers, P solubilizers and dehydrogenase enzyme activity of soil. Organic tubers had higher dry matter, starch, crude protein, K, Ca and Mg and lower oxalate contents. Use of organically produced seed materials, seed treatment in cow-dung, neem cake, bio-inoculant slurry, farmyard manure incubated with bio-inoculants, green manuring, use of neem cake, biofertilizers and ash formed the strategies for organic production.
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Claims 16
Claim · model-written summary
Organic management gave significantly higher elephant foot yam yield (20%, 57.10 tonnes/ha) than conventional practice (47.61 tonnes/ha).
Verbatim
e0“Organic management resulted in significantly higher yield of 20% (57.10 tonnes/ha) over conventional practice (47.61 tonnes/ha) in elephant foot yam”
Claim · model-written summary
Organic management gave significantly higher white yam yield (pooled mean 22.21 tonnes/ha), a 9% increase over chemical based farming.
- Taxon
- white yam
Dioscorea cayenensis subsp. rotundatae1 - Treatment
- Organic managemente0
- Outcome
- yielde0
- Direction
- highere0
- Value
- 9%e2
- Qualifier
- 22.21e1
- Comparator
- chemical based farminge2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Organic management also produced significantly higher yield in all the three species of yams”
e1“22.21, 21.96 and 16.83 tonnes/ha for white yam”
e2“9%, 11% and 7%, respectively over chemical based farming”
Claim · model-written summary
Organic management gave significantly higher greater yam yield (pooled mean 21.96 tonnes/ha), an 11% increase over chemical based farming.
- Taxon
- greater yam
Dioscorea alatae1 - Treatment
- Organic managemente0
- Outcome
- yielde0
- Direction
- highere0
- Value
- 11%e2
- Qualifier
- 21.96e1
- Comparator
- chemical based farminge2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Organic management also produced significantly higher yield in all the three species of yams”
e1“21.96 and 16.83 tonnes/ha for white yam, greater yam”
e2“9%, 11% and 7%, respectively over chemical based farming”
Claim · model-written summary
Organic management gave significantly higher lesser yam yield (pooled mean 16.83 tonnes/ha), a 7% increase over chemical based farming.
- Taxon
- lesser yam
Dioscorea esculentae1 - Treatment
- Organic managemente0
- Outcome
- yielde0
- Direction
- highere0
- Value
- 7%e2
- Qualifier
- 16.83e1
- Comparator
- chemical based farminge2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Organic management also produced significantly higher yield in all the three species of yams”
e1“16.83 tonnes/ha for white yam, greater yam and lesser yam”
e2“9%, 11% and 7%, respectively over chemical based farming”
Claim · model-written summary
Organic management lowered soil bulk density by 2.3% in elephant foot yam.
- Taxon
- elephant foot yame0
- Treatment
- Organic managemente0
- Outcome
- bulk densitye0
- Direction
- lowerede0
- Value
- 2.3%e0
Not reportedComparator
Verbatim
e0“Organic management lowered the bulk density by 2.3%, improved the water holding capacity by 28.4% and the porosity of soil by 16.5% in elephant foot yam”
Claim · model-written summary
Organic management improved soil water holding capacity by 28.4% in elephant foot yam.
- Taxon
- elephant foot yame0
- Treatment
- Organic managemente0
- Outcome
- water holding capacitye0
- Direction
- improvede0
- Value
- 28.4%e0
Not reportedComparator
Verbatim
e0“Organic management lowered the bulk density by 2.3%, improved the water holding capacity by 28.4% and the porosity of soil by 16.5% in elephant foot yam”
Claim · model-written summary
Organic management improved soil porosity by 16.5% in elephant foot yam.
- Taxon
- elephant foot yame0
- Treatment
- Organic managemente0
- Outcome
- porosity of soile0
- Direction
- improvede0
- Value
- 16.5%e0
Not reportedComparator
Verbatim
e0“Organic management lowered the bulk density by 2.3%, improved the water holding capacity by 28.4% and the porosity of soil by 16.5% in elephant foot yam”
Claim · model-written summary
Soil pH increased significantly by 0.46-0.77 unit under organic management in the yam trials.
Verbatim
e7“elephant foot yam and yams (Dioscorea spp.)”
e0“significant increase in pH (0.46-0.77 unit increase)”
Claim · model-written summary
Soil organic C was higher by 15-19% in the yam trials.
Verbatim
e7“elephant foot yam and yams (Dioscorea spp.)”
e0“higher organic C (by 15-19%)”
Claim · model-written summary
Soil available N, P and K were higher in the yam trials.
Verbatim
e7“elephant foot yam and yams (Dioscorea spp.)”
e0“available N, P and K”
Claim · model-written summary
Soil bacterial and fungal populations were higher in the yam trials.
Verbatim
e7“elephant foot yam and yams (Dioscorea spp.)”
e0“bacterial and fungal populations”
Claim · model-written summary
Soil N fixers, P solubilizers and dehydrogenase enzyme activity were higher in the yam trials.
Verbatim
e7“elephant foot yam and yams (Dioscorea spp.)”
e0“N fixers, P solubilizers and dehydrogenase enzyme activity”
Claim · model-written summary
Organic tubers had higher dry matter, starch and crude protein.
Verbatim
e7“elephant foot yam and yams (Dioscorea spp.)”
e0“higher dry matter, starch, crude protein”
Claim · model-written summary
Organic tubers had higher K, Ca and Mg contents.
Verbatim
e7“elephant foot yam and yams (Dioscorea spp.)”
e0“higher dry matter, starch, crude protein, K, Ca and Mg”
Claim · model-written summary
Organic tubers had lower oxalate contents.
Verbatim
e7“elephant foot yam and yams (Dioscorea spp.)”
e0“lower oxalate contents”
Claim · model-written summary
Organically produced seed materials, seed treatment, manures, neem cake, biofertilizers and ash formed the strategies for organic production of the tuberous vegetables.
Verbatim
e7“elephant foot yam and yams (Dioscorea spp.)”
e0“formed the strategies for organic production”
The same questions in other papers
cultivation system · yield · Dioscorea cayenensis (yellow yam)Positive and negative results
2 papers in the same direction as this paper · 1 in the opposite direction
- negative
- positive
- positive
cultivation system · yield · Dioscorea alata (water yam)Results agree
1 paper in the same direction as this paper
- positive
cultivation system · yield · Dioscorea esculenta (lesser yam)Results agree
1 paper in the same direction as this paper
- positive
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.