Abstract
The influence of NPK fertilizer on the incidence, severity and gravity of cassava mosaic disease (CMD) was investigated using eight genetically improved cassava varieties and eight local farmer’s varieties. The study was carried out in a savannah region (Gandajika) in D.R. Congo at two locations. The varieties were planted with and without NPK fertilization. Application of NPK fertilizer significantly (P<0.05) increased CMD incidence, severity (AUDPC) and gravity overtime compared to the trials without fertilizers for all the improved cassava varieties evaluated. The CMD incidence remained below 30% of infected plants for improved cassava varieties and reached 100% of plants for local varieties during the six months trial. The same trend was observed for CMD gravity (number of infected leaves per plant) that was below 50% for improved varieties while reaching 100% for all the local varieties at 6 MAP. High incidence and gravity of CMD were observed on local varieties just one month after planting. NPK fertilizers increased significantly the CMD incidence and gravity compared to control site during the first month after plantation. Thereafter, the effect of NPK fertilizer on CMD symptom expression was not noticeable since all the plants from local varieties were infected regardless of the fertilization regimen.
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Claims 8
Claim · model-written summary
NPK fertilizer significantly increased CMD incidence, severity and gravity in improved cassava varieties.
- Taxon
- cassava
Manihot esculentat0 - Material
- improved cassava varietiese0
- Treatment
- NPK fertilizere0
- Outcome
- CMD incidence, severity (AUDPC) and gravitye0
- Direction
- increasede0
- Comparator
- trials without fertilizerse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Application of NPK fertilizer significantly (P<0.05) increased CMD incidence, severity (AUDPC) and gravity overtime compared to the trials without fertilizers for all the improved cassava varieties evaluated.”
t0“cassava”
Claim · model-written summary
CMD incidence was below 30% in improved cassava varieties.
- Taxon
- cassavaManihot esculentat0
- Material
- improved cassava varietiese0
- Outcome
- CMD incidencee0
- Direction
- belowe0
- Value
- 30%e0
- Qualifier
- during the six months triale0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The CMD incidence remained below 30% of infected plants for improved cassava varieties and reached 100% of plants for local varieties during the six months trial.”
t0“cassava”
Claim · model-written summary
CMD incidence reached 100% in local varieties.
- Taxon
- cassavaManihot esculentat0
- Material
- local varietiese0
- Outcome
- CMD incidencee0
- Direction
- reachede0
- Value
- 100%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The CMD incidence remained below 30% of infected plants for improved cassava varieties and reached 100% of plants for local varieties during the six months trial.”
t0“cassava”
Claim · model-written summary
CMD gravity was below 50% in improved varieties.
- Taxon
- cassavaManihot esculentat0
- Material
- improved varietiese0
- Outcome
- CMD gravitye0
- Direction
- belowe0
- Value
- 50%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“CMD gravity (number of infected leaves per plant) that was below 50% for improved varieties while reaching 100% for all the local varieties at 6 MAP.”
t0“cassava”
Claim · model-written summary
CMD gravity reached 100% in local varieties at 6 MAP.
- Taxon
- cassavaManihot esculentat0
- Material
- local varietiese0
- Outcome
- CMD gravitye0
- Direction
- reachinge0
- Value
- 100%e0
- Qualifier
- at 6 MAPe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“CMD gravity (number of infected leaves per plant) that was below 50% for improved varieties while reaching 100% for all the local varieties at 6 MAP.”
t0“cassava”
Claim · model-written summary
Local varieties showed high CMD incidence and gravity one month after planting.
- Taxon
- cassavaManihot esculentat0
- Material
- local varietiese0
- Outcome
- incidence and gravity of CMDe0
- Direction
- Highe0
- Qualifier
- just one month after plantinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“High incidence and gravity of CMD were observed on local varieties just one month after planting.”
t0“cassava”
Claim · model-written summary
NPK fertilizer significantly increased CMD incidence and gravity during the first month.
- Taxon
- cassavaManihot esculentat0
- Treatment
- NPK fertilizerse0
- Outcome
- CMD incidence and gravitye0
- Direction
- increasede0
- Qualifier
- during the first month after plantatione0
- Comparator
- control sitee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“NPK fertilizers increased significantly the CMD incidence and gravity compared to control site during the first month after plantation.”
t0“cassava”
Claim · model-written summary
Later, fertilizer did not noticeably alter CMD symptoms in local varieties after all plants became infected.
- Taxon
- cassavaManihot esculentat0
- Material
- local varietiese0
- Treatment
- NPK fertilizere0
- Outcome
- CMD symptom expressione0
- Direction
- not noticeablee0
- Comparator
- regardless of the fertilization regimene0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Thereafter, the effect of NPK fertilizer on CMD symptom expression was not noticeable since all the plants from local varieties were infected regardless of the fertilization regimen.”
t0“cassava”
The same questions in other papers
fertilization · disease · Manihot esculenta (cassava)Positive and negative results
6 papers in the same direction as this paper · 2 in the opposite direction
- no effect
- positive
- positive
5 papers more in this group
See all 9 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.