Abstract
A field study was conducted to determine the effect of organic and mineral-based fertilizers on phytochemical contents in the tubers of two cassava varieties. Treatments were arranged in a split plot design with three replicates. The main plot was fertilizer source (vermicompost, empty fruit bunch compost and inorganic fertilizer) and sub-plot was cassava variety (Medan and Sri Pontian). The amount of fertilizer applied was based on 180 kg K(2)O ha-1. The tubers were harvested and analyzed for total flavonoids, total phenolics, antioxidant activity and cyanogenic glucoside content. Total phenolic and flavonoid compounds were determined using the Folin-Ciocalteu assay and aluminium chloride colorimetric method, respectively. Different sources of fertilizer, varieties and their interactions were found to have a significant effect on phytochemical content. The phenolic and flavonoid content were significantly higher (p < 0.01) in the vermicompost treatment compared to mineral fertilizer and EFB compost. The total flavonoids and phenolics content of vermicompost treated plants were 39% and 38% higher, respectively, than those chemically fertilized. The antioxidant activity determined using the DPPH and FRAP assays were high with application of organic fertilizer. Cyanogenic glycoside levels were decreased with the application of organic fertilizer. Among the two types of compost, vermicompost resulted in higher nutritional value of cassava tubers. Medan variety with application of vermicompost showed the most promising nutritional quality. Since the nutritional quality of cassava can be improved by organic fertilization, organic fertilizer should be used in place of chemical fertilizer for environmentally sustainable production of better quality cassava.
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Claims 8
Claim · model-written summary
Fertilizer source, variety and their interaction significantly affected cassava phytochemical content.
- Taxon
- cassava
Manihot esculentae1 - Material
- varietiese0
- Treatment
- Different sources of fertilizere0
- Outcome
- phytochemical contente0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Different sources of fertilizer, varieties and their interactions were found to have a significant effect on phytochemical content.”
e1“cassava varieties”
Claim · model-written summary
Vermicompost increased phenolic content by 38% over chemical fertilizer.
- Taxon
- cassavaManihot esculentae1
- Treatment
- vermicomposte0
- Outcome
- phenolics contente0
- Direction
- highere0
- Value
- 38%e0
- Comparator
- chemically fertilizede0
Not reportedOrgan / stage
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The total flavonoids and phenolics content of vermicompost treated plants were 39% and 38% higher, respectively, than those chemically fertilized.”
e1“cassava varieties”
e2“The phenolic and flavonoid content were significantly higher (p < 0.01) in the vermicompost treatment compared to mineral fertilizer and EFB compost.”
Claim · model-written summary
Vermicompost increased flavonoid content by 39% over chemical fertilizer.
- Taxon
- cassavaManihot esculentae1
- Treatment
- vermicomposte0
- Outcome
- flavonoidse0
- Direction
- highere0
- Value
- 39%e0
- Comparator
- chemically fertilizede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The total flavonoids and phenolics content of vermicompost treated plants were 39% and 38% higher, respectively, than those chemically fertilized.”
e1“cassava varieties”
e2“The phenolic and flavonoid content were significantly higher (p < 0.01) in the vermicompost treatment compared to mineral fertilizer and EFB compost.”
Claim · model-written summary
Organic fertilizer gave high antioxidant activity in cassava tubers.
- Taxon
- cassavaManihot esculentae1
- Treatment
- organic fertilizere0
- Outcome
- antioxidant activitye0
- Direction
- highe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The antioxidant activity determined using the DPPH and FRAP assays were high with application of organic fertilizer.”
e1“cassava varieties”
Claim · model-written summary
Organic fertilizer decreased cyanogenic glycoside levels in cassava tubers.
- Taxon
- cassavaManihot esculentae1
- Treatment
- organic fertilizere0
- Outcome
- Cyanogenic glycoside levelse0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cyanogenic glycoside levels were decreased with the application of organic fertilizer.”
e1“cassava varieties”
Claim · model-written summary
Vermicompost yielded higher nutritional value than the other compost.
- Taxon
- cassavaManihot esculentae0
- Organ / stage
- tuberse0
- Treatment
- vermicomposte0
- Outcome
- nutritional valuee0
- Direction
- highere0
- Comparator
- two types of composte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Among the two types of compost, vermicompost resulted in higher nutritional value of cassava tubers.”
Claim · model-written summary
Medan cassava with vermicompost had the most promising nutritional quality.
- Taxon
- cassavaManihot esculentae1
- Material
- Medane0
- Treatment
- vermicomposte0
- Outcome
- nutritional qualitye0
- Direction
- most promisinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Medan variety with application of vermicompost showed the most promising nutritional quality.”
e1“cassava varieties”
Claim · model-written summary
The authors recommend organic fertilizer instead of chemical fertilizer for better-quality cassava production.
- Taxon
- cassavaManihot esculentae0
- Outcome
- organic fertilizer should be used in place of chemical fertilizere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“organic fertilizer should be used in place of chemical fertilizer for environmentally sustainable production of better quality cassava.”
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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.