Abstract
Cassava (Manihot esculenta Crantz) is an important staple crop, especially for resource-poor populations. Cassava-based diets are rich in calories but grossly deficient in essential mineral elements. A field study in southeastern Nigeria aimed at increasing yields and concentrations of bioavailable mineral elements in a β-carotene cassava variety, UMUCASS 38 (TMS 01/1371), through agronomic biofortification. A randomized complete block design experiment in triplicate, with foliar application of Zn (3.0 kg ha−1 Zn as ZnSO4), I (4.0 kg ha−1 I as KI), Se (0.25 kg ha−1 Se as Na2SeO3) and Zn + Se + I in combination at vegetative, tuber initiation and bulking stages of cassava. Results indicated neither phytotoxicity nor altered physical and chemical soil properties. Application of Zn or Zn + Se + I at the vegetative stage significantly increased cassava tuber yields. More Zn, Se, and I accumulated in fresh and processed cassava tuber products (gari, lafun), especially when Zn + Se + I was applied at tuber initiation stage. The combined application of Zn + Se + I consistently outperformed sole applications indicating a synergistic interaction effect between the three elements. It is concluded that in the Zn-deficient soils of southeast Nigeria, yield of cassava root tubers can be significantly increased by foliar application of Zn-containing fertilizer at the vegetative stage, but for optimal accumulation of elemental Zn, Se, and I, a combined Zn + Se + I fertilizer be applied at the tuber initiation stage.
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Claims 5
Claim · model-written summary
Application of Zn or Zn + Se + I at the vegetative stage significantly increased cassava tuber yields in a field study in southeastern Nigeria.
- Taxon
- cassava
Manihot esculentae1 - Material
- UMUCASS 38 (TMS 01/1371)e0
- Organ / stage
- tubere1
- Treatment
- Application of Zn or Zn + Se + I at the vegetative stagee1
- Outcome
- tuber yieldse1
- Direction
- increasede1
- Setting
- southeastern Nigeriae0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A field study in southeastern Nigeria aimed at increasing yields and concentrations of bioavailable mineral elements in a β-carotene cassava variety, UMUCASS 38 (TMS 01/1371), through agronomic biofortification”
e1“Application of Zn or Zn + Se + I at the vegetative stage significantly increased cassava tuber yields”
Claim · model-written summary
Zn + Se + I applied at tuber initiation stage increased Zn, Se and I accumulation in fresh and processed cassava tuber products (gari, lafun), especially.
- Taxon
- cassavaManihot esculentae2
- Material
- UMUCASS 38 (TMS 01/1371)e0
- Treatment
- Zn + Se + I was applied at tuber initiation stagee2
- Outcome
- Zn, Se, and I accumulated in fresh and processed cassava tuber productse2
- Direction
- Moree2
- Qualifier
- especiallye2
- Setting
- southeastern Nigeriae0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A field study in southeastern Nigeria aimed at increasing yields and concentrations of bioavailable mineral elements in a β-carotene cassava variety, UMUCASS 38 (TMS 01/1371), through agronomic biofortification”
e2“More Zn, Se, and I accumulated in fresh and processed cassava tuber products (gari, lafun), especially when Zn + Se + I was applied at tuber initiation stage”
Claim · model-written summary
The combined application of Zn + Se + I consistently outperformed sole applications, indicating a synergistic interaction effect between the three elements, in cassava.
- Taxon
- cassavaManihot esculentae6
- Treatment
- The combined application of Zn + Se + Ie3
- Outcome
- consistently outperformede3
- Direction
- outperformede3
- Qualifier
- synergistic interaction effecte3
- Comparator
- sole applicationse3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e6“with foliar application of Zn (3.0 kg ha−1 Zn as ZnSO4), I (4.0 kg ha−1 I as KI), Se (0.25 kg ha−1 Se as Na2SeO3) and Zn + Se + I in combination at vegetative, tuber initiation and bulking stages of cassava”
e3“The combined application of Zn + Se + I consistently outperformed sole applications indicating a synergistic interaction effect between the three elements”
Claim · model-written summary
Foliar application of Zn, Se and I caused neither phytotoxicity nor altered physical and chemical soil properties in cassava.
- Taxon
- cassavaManihot esculentae6
- Treatment
- foliar application of Zne6
- Outcome
- phytotoxicity nor altered physical and chemical soil propertiese4
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“Results indicated neither phytotoxicity nor altered physical and chemical soil properties”
e6“with foliar application of Zn (3.0 kg ha−1 Zn as ZnSO4), I (4.0 kg ha−1 I as KI), Se (0.25 kg ha−1 Se as Na2SeO3) and Zn + Se + I in combination at vegetative, tuber initiation and bulking stages of cassava”
Claim · model-written summary
In Zn-deficient soils of southeast Nigeria, a combined Zn + Se + I fertilizer should be applied at the tuber initiation stage for optimal accumulation of elemental Zn, Se and I in cassava.
- Taxon
- cassavaManihot esculentae5
- Treatment
- combined Zn + Se + I fertilizer be applied at the tuber initiation stagee5
- Outcome
- optimal accumulation of elemental Zn, Se, and Ie5
- Setting
- Zn-deficient soils of southeast Nigeriae5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“It is concluded that in the Zn-deficient soils of southeast Nigeria, yield of cassava root tubers can be significantly increased by foliar application of Zn-containing fertilizer at the vegetative stage, but for optimal accumulation of elemental Zn, Se, and I, a combined Zn + Se + I fertilizer be applied at the tuber initiation stage”
The same questions in other papers
zinc atom · nutrient: content · Manihot esculenta (cassava)Positive and negative results
3 papers in the same direction as this paper · 1 in the opposite direction
- negative
- positive
- positive
1 paper more in this group
See all 5 papers →zinc atom · yield · Manihot esculenta (cassava)Results agree
5 papers in the same direction as this paper
- positive
- positive
- positive
2 papers more in this group
See all 6 papers →application · crop injury · Manihot esculenta (cassava)Results agree
1 paper in the same direction as this paper
- no effect
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.