Abstract
Cassava is an important staple food in subtropical regions; however, its production is adversely affectedby cassava brown streak disease and poor soil fertility. Five improved and two local cassava varieties wereevaluated for three seasons across two sites in Kizimbani, Zanzibar. Highly significant differences were detectedamong varieties, sites and years for fresh shoot yield, and fresh root yield. For cassava brown streak diseaseassociated root necrosis, highly significant differences were detected only between varieties but not sites oryears. On average, the site that had a slightly higher soil nitrogen level recorded ∼126% higher fresh root yield. Two improved varieties, ‘Kizimbani’ and ‘Machui’, produced significantly higher fresh root yields than the bestlocal variety, ‘Mwari’. However, the local variety ‘Boma’ is preferred by farmers in Zanzibar because it has betterfresh consumption qualities than ‘Mwari’. ‘Boma’ is highly susceptible to cassava brown streak disease andproduces a poor yield. The four released varieties, ‘Kama’, ‘Kizimbani’, ‘Mahonda’ and ‘Machui’ were superior to‘Boma’ in cassava brown streak disease resistance and yield. Further, soil fertility improvement and productionsystem intensification are needed to enhance productivity.
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Claims 10
Claim · model-written summary
Cassava fresh shoot yield and fresh root yield differed highly significantly among varieties, sites and years.
- Taxon
- cassava
Manihot esculentat0 - Outcome
- fresh shoot yield, and fresh root yielde0
- Qualifier
- differences were detectedamong varieties, sites and yearse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Highly significant differences were detectedamong varieties, sites and years for fresh shoot yield, and fresh root yield”
t0“cassava”
Claim · model-written summary
Cassava brown streak disease-associated root necrosis differed highly significantly only between varieties, not between sites or years.
- Taxon
- cassavaManihot esculentat0
- Outcome
- cassava brown streak diseaseassociated root necrosise0
- Qualifier
- only between varieties but not sites oryearse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“For cassava brown streak diseaseassociated root necrosis, highly significant differences were detected only between varieties but not sites oryears”
t0“cassava”
Claim · model-written summary
The site with a slightly higher soil nitrogen level recorded about 126% higher cassava fresh root yield.
- Taxon
- cassavaManihot esculentat0
- Compound
- soil nitrogen levele0
- Outcome
- fresh root yielde0
- Direction
- highere0
- Value
- ∼126%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the site that had a slightly higher soil nitrogen level recorded ∼126% higher fresh root yield”
t0“cassava”
Claim · model-written summary
The improved cassava variety Kizimbani produced significantly higher fresh root yield than the best local variety Mwari.
- Taxon
- cassavaManihot esculentat0
- Material
- Kizimbanie0
- Outcome
- fresh root yieldse0
- Direction
- highere0
- Comparator
- Mwarie0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Two improved varieties, ‘Kizimbani’ and ‘Machui’, produced significantly higher fresh root yields than the bestlocal variety, ‘Mwari’”
t0“cassava”
Claim · model-written summary
The improved cassava variety Machui produced significantly higher fresh root yield than the best local variety Mwari.
- Taxon
- cassavaManihot esculentat0
- Material
- Machuie0
- Outcome
- fresh root yieldse0
- Direction
- highere0
- Comparator
- Mwarie0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Two improved varieties, ‘Kizimbani’ and ‘Machui’, produced significantly higher fresh root yields than the bestlocal variety, ‘Mwari’”
t0“cassava”
Claim · model-written summary
The local cassava variety Boma is preferred by farmers in Zanzibar because it has better fresh consumption qualities than Mwari.
- Taxon
- cassavaManihot esculentat0
- Material
- Bomae0
- Outcome
- preferred by farmerse0
- Qualifier
- betterfresh consumption qualitiese0
- Comparator
- Mwarie0
- Setting
- Zanzibare0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the local variety ‘Boma’ is preferred by farmers in Zanzibar because it has betterfresh consumption qualities than ‘Mwari’”
t0“cassava”
Claim · model-written summary
The cassava variety Boma is highly susceptible to cassava brown streak disease.
- Taxon
- cassavaManihot esculentat0
- Material
- Bomae0
- Outcome
- highly susceptible to cassava brown streak diseasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“‘Boma’ is highly susceptible to cassava brown streak disease andproduces a poor yield”
t0“cassava”
Claim · model-written summary
The cassava variety Boma produces a poor yield.
- Taxon
- cassavaManihot esculentat0
- Material
- Bomae0
- Outcome
- poor yielde0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“‘Boma’ is highly susceptible to cassava brown streak disease andproduces a poor yield”
t0“cassava”
Claim · model-written summary
The four released cassava varieties Kama, Kizimbani, Mahonda and Machui were superior to Boma in cassava brown streak disease resistance and yield.
- Taxon
- cassavaManihot esculentat0
- Material
- four released varietiese0
- Outcome
- cassava brown streak disease resistance and yielde0
- Direction
- superiore0
- Comparator
- Bomae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The four released varieties, ‘Kama’, ‘Kizimbani’, ‘Mahonda’ and ‘Machui’ were superior to‘Boma’ in cassava brown streak disease resistance and yield”
t0“cassava”
Claim · model-written summary
The authors recommend soil fertility improvement and production system intensification to enhance cassava productivity.
- Taxon
- cassavaManihot esculentat0
- Outcome
- productivitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“soil fertility improvement and production system intensification are needed to enhance productivity”
t0“cassava”