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. Research Article
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Claims 11
Claim · model-written summary
NPK fertilizer increased CMD incidence in improved cassava varieties.
- Taxon
- cassava
Manihot esculentat0 - Material
- improved cassava varietiese0
- Treatment
- NPK fertilizere0
- Outcome
- CMD incidencee0
- 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
NPK fertilizer increased CMD severity in improved varieties.
- Taxon
- cassavaManihot esculentat0
- Material
- improved cassava varietiese0
- Treatment
- NPK fertilizere0
- Outcome
- severity (AUDPC)e0
- 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
NPK fertilizer increased CMD gravity in improved varieties.
- Taxon
- cassavaManihot esculentat0
- Material
- improved cassava varietiese0
- Treatment
- NPK fertilizere0
- Outcome
- 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 Mosaic Disease (CMD) Expression”
Claim · model-written summary
CMD incidence stayed below 30% in improved varieties.
- Taxon
- cassavaManihot esculentae0
- Material
- improved cassava varietiese0
- Outcome
- CMD incidencee0
- Value
- 30%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“CMD incidence remained below 30% of infected plants for improved cassava varieties”
Claim · model-written summary
CMD incidence reached 100% in local varieties.
- Taxon
- CassavaManihot esculentat0
- Material
- local varietiese0
- Outcome
- CMD incidencee1
- Value
- 100%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“reached 100% of plants for local varieties during the six months trial”
t0“Cassava Mosaic Disease (CMD)”
e1“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”
Claim · model-written summary
CMD gravity stayed below 50% in improved varieties.
- Taxon
- CassavaManihot esculentat0
- Material
- improved varietiese0
- Outcome
- CMD gravitye0
- 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”
t0“Cassava”
Claim · model-written summary
CMD gravity reached 100% in local varieties at six months.
- Taxon
- CassavaManihot esculentat0
- Material
- local varietiese0
- Outcome
- CMD gravitye1
- Value
- 100%e0
- Qualifier
- 6 MAPe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“reaching 100% for all the local varieties at 6 MAP”
t0“Cassava Mosaic Disease (CMD)”
e1“CMD gravity (number of infected leaves per plant) that was below 50% for improved varieties”
Claim · model-written summary
Local varieties had high CMD incidence and gravity one month after planting.
- Taxon
- CassavaManihot esculentat0
- Material
- local varietiese0
- Outcome
- incidence and gravity of CMDe0
- Qualifier
- 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 increased CMD incidence in local varieties during the first month.
- Taxon
- CassavaManihot esculentat0
- Treatment
- NPK fertilizerse0
- Outcome
- CMD incidencee0
- Direction
- increasede0
- Qualifier
- 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
NPK fertilizer increased CMD gravity during the first month.
- Taxon
- CassavaManihot esculentat0
- Treatment
- NPK fertilizerse0
- Outcome
- gravitye0
- Direction
- increasede0
- Qualifier
- 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 fertilization effects on symptoms were not noticeable because all local plants were infected.
- Taxon
- CassavaManihot esculentat0
- Material
- local varietiese0
- Treatment
- NPK fertilizere0
- Outcome
- CMD symptom expressione0
- Direction
- not noticeablee0
- Comparator
- fertilization regimene0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“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
- positive
- positive
- negative
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.