Abstract
The use of plant tissue analysis as a tool for attaining low cyanogenic glucoside levels in cassava roots, has hardly been investigated. Just as the quality of crops is improved through the use of plant tissue analysis, the same can probably be done to consistently attain the lowest possible cyanogenic glucoside levels in cassava roots. High levels of cyanogenic glucosides in consumed fresh cassava roots or in their products have the potential of causing cyanide intoxication, hence the need to lower them. An experiment was thus conducted to assess the occurrence of meaningful relationships between plant nutritional status and cyanogenic glucoside production in cassava roots. Total hydrogen cyanide (HCN) levels in cassava roots were used to assess cyanogenic glucoside production. Using NPK fertiliser application to induce changes in plant nutritional status, the main objective of the study was investigated using the following sub-objectives; (1) to determine the effects of increased NPK fertiliser application on cassava root HCN levels; (2) and to show the occurrence of relationships between changes in nutrient levels in plant 'indicator tissue' and HCN levels in cassava roots. The study was a field experiment laid out as a split-plot in a randomized complete block design with three replicates. It was repeated in two consecutive years, with soil nutrient deficiencies only being corrected in the second year. The varieties Salanga, Kalinda, Supa and Kiroba were used in the experiment, while the NPK fertiliser treatments included; a control with no fertiliser applied; a moderate NPK treatment (50 kg N + 10 kg P + 50 kg K /ha); and a high NPK treatment (100 kg N + 25 kg P + 100 kg K /ha). A potassium only treatment (50 kg K/ha) was also included, but mainly for comparison. The root HCN levels of Salanga, Kalinda and Kiroba were significantly influenced by NPK fertiliser application in at least one of the two field experiments, while those of Supa remained uninfluenced. Changes in plant nutritional status in response to fertiliser application were thus shown to influence cyanogenic glucoside production. The results of the multiple linear regression analysis for the first field experiment, generally showed that the root HCN levels of some cassava varieties could have been 'reduced' by decreasing concentrations of nitrogen, potassium and magnesium in plants, or by improving plant calcium concentrations along with NPK fertiliser application. However, in the second field experiment (with corrected soil nutrient deficiencies) the regression analysis generally showed that the root HCN levels of some cassava varieties could have been 'reduced' by improving either one or a combination of the nutrients phosphorous, zinc and potassium in plants along with NPK fertiliser application. Although the results obtained in the two experiments had been contradicting due to slight differences in how they were conducted, the study had nonetheless demonstrated the occurrence of meaningful relationships between plant nutritional status and cyanogenic glucoside production; confirming the possible use of plant tissue analysis in predicting fertiliser needs for the consistent attainment of low cyanogenic glucosides in cassava roots.
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Claims 7
Claim · model-written summary
NPK fertiliser application significantly influenced root HCN levels of cassava varieties Salanga, Kalinda and Kiroba in at least one of two field experiments.
- Taxon
- cassava
Manihot esculentae2 - Material
- Salanga, Kalinda and Kirobae0
- Treatment
- NPK fertiliser applicatione0
- Outcome
- root HCN levelse0
- Comparator
- a control with no fertiliser appliede1
- Setting
- field experimentse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The root HCN levels of Salanga, Kalinda and Kiroba were significantly influenced by NPK fertiliser application in at least one of the two field experiments, while those of Supa remained uninfluenced”
e1“a control with no fertiliser applied”
e2“Total hydrogen cyanide (HCN) levels in cassava roots were used to assess cyanogenic glucoside production”
Claim · model-written summary
Root HCN levels of cassava variety Supa were not influenced by NPK fertiliser application.
- Taxon
- cassavaManihot esculentae2
- Material
- Supae0
- Treatment
- NPK fertiliser applicatione0
- Outcome
- root HCN levelse0
- Comparator
- a control with no fertiliser appliede1
- Setting
- field experimentse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The root HCN levels of Salanga, Kalinda and Kiroba were significantly influenced by NPK fertiliser application in at least one of the two field experiments, while those of Supa remained uninfluenced”
e1“a control with no fertiliser applied”
e2“Total hydrogen cyanide (HCN) levels in cassava roots were used to assess cyanogenic glucoside production”
Claim · model-written summary
In the first field experiment, root HCN levels of some cassava varieties could have been reduced by decreasing nitrogen, potassium and magnesium concentrations in plants.
- Taxon
- cassavaManihot esculentae2
- Compound
- nitrogen, potassium and magnesiume3
- Outcome
- root HCN levelse3
- Direction
- reducede3
- Qualifier
- could have beene3
- Setting
- first field experimente3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“Total hydrogen cyanide (HCN) levels in cassava roots were used to assess cyanogenic glucoside production”
e3“The results of the multiple linear regression analysis for the first field experiment, generally showed that the root HCN levels of some cassava varieties could have been 'reduced' by decreasing concentrations of nitrogen, potassium and magnesium in plants, or by improving plant calcium concentrations along with NPK fertiliser application”
Claim · model-written summary
Improving plant calcium concentrations along with NPK fertiliser application could have reduced root HCN levels of cassava varieties.
- Taxon
- cassavaManihot esculentae2
- Treatment
- NPK fertiliser applicatione3
- Compound
- calciume3
- Outcome
- root HCN levelse3
- Direction
- reducede3
- Qualifier
- could have beene3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“Total hydrogen cyanide (HCN) levels in cassava roots were used to assess cyanogenic glucoside production”
e3“The results of the multiple linear regression analysis for the first field experiment, generally showed that the root HCN levels of some cassava varieties could have been 'reduced' by decreasing concentrations of nitrogen, potassium and magnesium in plants, or by improving plant calcium concentrations along with NPK fertiliser application”
Claim · model-written summary
In the second field experiment, root HCN levels of some cassava varieties could have been reduced by improving phosphorous, zinc and potassium in plants along with NPK fertiliser application.
- Taxon
- cassavaManihot esculentae2
- Treatment
- NPK fertiliser applicatione4
- Compound
- phosphorous, zinc and potassiume4
- Outcome
- root HCN levelse4
- Direction
- reducede4
- Qualifier
- with corrected soil nutrient deficienciese4
- Setting
- second field experimente4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“Total hydrogen cyanide (HCN) levels in cassava roots were used to assess cyanogenic glucoside production”
e4“in the second field experiment (with corrected soil nutrient deficiencies) the regression analysis generally showed that the root HCN levels of some cassava varieties could have been 'reduced' by improving either one or a combination of the nutrients phosphorous, zinc and potassium in plants along with NPK fertiliser application”
Claim · model-written summary
Plant nutritional status and cyanogenic glucoside production were meaningfully related in cassava.
- Taxon
- cassavaManihot esculentae2
- Treatment
- plant nutritional statuse5
- Outcome
- cyanogenic glucoside productione5
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“Total hydrogen cyanide (HCN) levels in cassava roots were used to assess cyanogenic glucoside production”
e5“the study had nonetheless demonstrated the occurrence of meaningful relationships between plant nutritional status and cyanogenic glucoside production”
Claim · model-written summary
Plant tissue analysis may be used to predict fertiliser needs for consistently low cyanogenic glucoside levels in cassava roots.
- Taxon
- cassavaManihot esculentae6
- Outcome
- plant tissue analysis in predicting fertiliser needse6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e6“confirming the possible use of plant tissue analysis in predicting fertiliser needs for the consistent attainment of low cyanogenic glucosides in cassava roots”
The same questions in other papers
fertilization · molecular: metabolites · Manihot esculenta (cassava)Results differ
5 papers in the same direction as this paper · 11 in the opposite direction
- no effect
- positive
- positive
13 papers more in this group
See all 17 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.