Abstract
Summary Field experiments were made in the rainforest zone of Western Nigeria over three cropping seasons on the effects of potassium fertilizer of one local cassava cultivar 53101 and two improved cultivars 60506 and 60447 which were F 1 hybrids of the former. The results showed that K-fertilizer increased the starch yields only slightly. Cultivar 60506 produced significantly higher starch yields ( P < 0–01) than the local strain, 53101, while cultivar 60447 gave lower starch recovery than the local cultivar. A definite influence of K application on the cyanide (HCN) content of the tuber roots could not be established. The peeled tubers of the improved cultivars contained much less cyanide than those of the local 53101 strain ( P < 0–01). Potassium had the highest (0·72–1·28% dry weight basis) while phosphorus had the lowest concentration (0·06–0·12%) in the peeled tuber. Owing to its higher yielding capability the unfertilized 60506 removed larger amounts of potash (average 110·9 kg k20/ha) from the soil than unfertilized 53101 (average 82·2 kg k20/ha).
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Claims 8
Claim · model-written summary
Potassium fertilizer increased starch yield only slightly.
- Taxon
- cassava
Manihot esculentat0 - Treatment
- K-fertilizere0
- Outcome
- starch yieldse0
- Direction
- increasede0
- Qualifier
- only slightlye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“K-fertilizer increased the starch yields only slightly.”
t0“cassava cultivars (Manihot esculenta)”
Claim · model-written summary
Cultivar 60506 produced significantly higher starch yields than 53101.
- Taxon
- cassavaManihot esculentat0
- Material
- 60506e0
- Outcome
- starch yieldse0
- Direction
- highere0
- Comparator
- 53101e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cultivar 60506 produced significantly higher starch yields ( P < 0–01) than the local strain, 53101”
t0“cassava cultivars (Manihot esculenta)”
Claim · model-written summary
Cultivar 60447 had lower starch recovery than the local cultivar.
- Taxon
- cassavaManihot esculentat0
- Material
- 60447e0
- Outcome
- starch recoverye0
- Direction
- lowere0
- Comparator
- local cultivare0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cultivar 60447 gave lower starch recovery than the local cultivar”
t0“cassava cultivars (Manihot esculenta)”
Claim · model-written summary
A definite potassium effect on tuber root cyanide could not be established.
- Taxon
- cassavaManihot esculentat0
- Treatment
- K applicatione0
- Outcome
- cyanide (HCN) content of the tuber rootse0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A definite influence of K application on the cyanide (HCN) content of the tuber roots could not be established.”
t0“cassava cultivars (Manihot esculenta)”
Claim · model-written summary
Improved cultivar peeled tubers had much less cyanide than local 53101.
- Taxon
- cassavaManihot esculentat0
- Material
- improved cultivarse0
- Organ / stage
- peeled tuberse0
- Outcome
- cyanidee0
- Direction
- much lesse0
- Comparator
- local 53101 straine0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The peeled tubers of the improved cultivars contained much less cyanide than those of the local 53101 strain ( P < 0–01).”
t0“cassava cultivars (Manihot esculenta)”
Claim · model-written summary
Potassium was the most concentrated nutrient in peeled tuber.
- Taxon
- cassavaManihot esculentat0
- Organ / stage
- peeled tubere0
- Outcome
- Potassium had the higheste0
- Value
- 0·72–1·28% dry weight basise0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Potassium had the highest (0·72–1·28% dry weight basis) while phosphorus had the lowest concentration (0·06–0·12%) in the peeled tuber.”
t0“cassava cultivars (Manihot esculenta)”
Claim · model-written summary
Phosphorus was the least concentrated nutrient in peeled tuber.
- Taxon
- cassavaManihot esculentat0
- Organ / stage
- peeled tubere0
- Outcome
- phosphorus had the lowest concentratione0
- Value
- 0·06–0·12%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Potassium had the highest (0·72–1·28% dry weight basis) while phosphorus had the lowest concentration (0·06–0·12%) in the peeled tuber.”
t0“cassava cultivars (Manihot esculenta)”
Claim · model-written summary
Unfertilized 60506 removed more potash than unfertilized 53101.
- Taxon
- cassavaManihot esculentat0
- Material
- 60506e0
- Outcome
- amounts of potashe0
- Direction
- largere0
- Value
- 110·9 kg k20/hae0
- Qualifier
- 82·2 kg k20/hae0
- Comparator
- 53101e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the unfertilized 60506 removed larger amounts of potash (average 110·9 kg k20/ha) from the soil than unfertilized 53101 (average 82·2 kg k20/ha)”
t0“cassava cultivars (Manihot esculenta)”
The same questions in other papers
potassium · quality: sugar starch · Manihot esculenta (cassava)Results agree
3 papers in the same direction as this paper
- positive
- positive
- positive
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.