Abstract
Introduction of improved cassava varieties may require proper fertilizer management for increased and sustained root production. A factorial experiment involving five cassava genotypes and four levels of fertilizer with three replications was established at the Council for Scientific and Industrial Research (CSIR)-Crop Research Institute, Fumesua near Ejisu, Ghana (6 0 43’00’N and 1 0 28’0”W). The five cassava genotypes (Debor, Afisafi, Tuaka, Afebankye and Sisipi 290) were fertilized with NPK at the following rates:F0: 0 N – 0 P2O5 – 0 K2O kg/ha (Control), F1: 60N – 30 P2O5 – 90 K2O kg/ha (Low), F2: 120N – 60 P2O5 – 180 K2O kg/ha (Medium) and F3: 180N – 90 P2O5 – 270 K2O kg/ha (High). The two trials were conducted from 9 th September 2007 to 17 th September 2008 and 22 nd May 2009 to 22 nd July 2010. Fertilizer significantly (P < 0.05) increased tuber yields. Fresh tuber yields of all the genotypes except Afisafi and Sisipe 290, generally, increased with increasing rates of fertilizer application. Whereas fresh root yields of Debor increased with increasing rates of the fertilizer up to the maximum rate (F3), yield reductions of Tuaka, Afisafi and Sisipe also occurred at this rate. All the genotypes gave similar root yield except Sisipe 290 which produced significantly lower root yield. Interaction between genotypes and fertilizer was significant. Fresh root yields of Debor, Tuaka and Afebankye were significantly (P < 5%) higher over the control at the lowest rate (F1). The economic rate of fertilization for higher fresh root yield of all other genotypes except Debor is F1. Sisipe 290 had the highest starch content at the F1 fertilizer treatment. For higher fresh root yields, 60N – 30 P2O5 – 90 K2O kg/ha (F1), 120N – 60 P2O5 – 180 K2O kg/ha (F2) and 180N – 90 P2O5 – 270 K2O kg/ha (F3) are recommended for Afebankye and Tuaka, Afisafi and Debor respectively. With regards to starch content, 60N – 30 P2O5 – 90 K2O kg/ha (F1 ) rate is recommended for Debor, Afisafi and Sisipe 290, while F2: 120N – 60 P2O5 – 180 K2O kg/ha for Tuaka.
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Claims 12
Claim · model-written summary
Fertilizer significantly increased cassava tuber yields.
- Taxon
- cassava
Manihot esculentat0 - Treatment
- Fertilizere1
- Outcome
- tuber yieldse1
- Direction
- increasede1
- Qualifier
- P < 0.05e1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Cassava Genotypes”
e1“Fertilizer significantly (P < 0.05) increased tuber yields”
Claim · model-written summary
Fresh tuber yields of most cassava genotypes increased with increasing fertilizer rates.
- Taxon
- cassavaManihot esculentat0
- Material
- all the genotypes except Afisafi and Sisipe 290e2
- Treatment
- increasing rates of fertilizer applicatione2
- Outcome
- Fresh tuber yieldse2
- Direction
- increasede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Cassava Genotypes”
e2“Fresh tuber yields of all the genotypes except Afisafi and Sisipe 290, generally, increased with increasing rates of fertilizer application”
Claim · model-written summary
Fresh root yield of Debor increased with fertilizer rates up to the maximum rate F3.
- Taxon
- cassavaManihot esculentat0
- Material
- Debore3
- Treatment
- up to the maximum rate (F3)e3
- Outcome
- fresh root yieldse3
- Direction
- increasede3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Cassava Genotypes”
e3“Whereas fresh root yields of Debor increased with increasing rates of the fertilizer up to the maximum rate (F3), yield reductions of Tuaka, Afisafi and Sisipe also occurred at this rate”
Claim · model-written summary
Yield of Tuaka, Afisafi and Sisipe 290 was reduced at the maximum fertilizer rate F3.
- Taxon
- cassavaManihot esculentat0
- Material
- Tuaka, Afisafi and Sisipee3
- Treatment
- up to the maximum rate (F3)e3
- Outcome
- yielde3
- Direction
- reductionse3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Cassava Genotypes”
e3“Whereas fresh root yields of Debor increased with increasing rates of the fertilizer up to the maximum rate (F3), yield reductions of Tuaka, Afisafi and Sisipe also occurred at this rate”
Claim · model-written summary
Sisipe 290 gave significantly lower root yield than the other genotypes.
- Taxon
- cassavaManihot esculentat0
- Material
- Sisipe 290e4
- Outcome
- root yielde4
- Direction
- lowere4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Cassava Genotypes”
e4“All the genotypes gave similar root yield except Sisipe 290 which produced significantly lower root yield”
Claim · model-written summary
All cassava genotypes gave similar root yield, apart from Sisipe 290.
- Taxon
- cassavaManihot esculentat0
- Material
- All the genotypese4
- Outcome
- root yielde4
- Direction
- similare4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Cassava Genotypes”
e4“All the genotypes gave similar root yield except Sisipe 290 which produced significantly lower root yield”
Claim · model-written summary
The interaction between genotypes and fertilizer was significant.
- Taxon
- cassavaManihot esculentat0
- Outcome
- Interaction between genotypes and fertilizere5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Cassava Genotypes”
e5“Interaction between genotypes and fertilizer was significant”
Claim · model-written summary
Fresh root yields of Debor, Tuaka and Afebankye were significantly higher than the control at the lowest rate F1.
- Taxon
- cassavaManihot esculentat0
- Material
- Debor, Tuaka and Afebankyee6
- Treatment
- lowest rate (F1)e6
- Outcome
- Fresh root yieldse6
- Direction
- highere6
- Qualifier
- P < 5%e6
- Comparator
- the controle6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Cassava Genotypes”
e6“Fresh root yields of Debor, Tuaka and Afebankye were significantly (P < 5%) higher over the control at the lowest rate (F1)”
Claim · model-written summary
Fertilizer rate F1 is the economic rate for higher fresh root yield of all genotypes except Debor.
- Taxon
- cassavaManihot esculentat0
- Material
- all other genotypes except Debore7
- Outcome
- economic rate of fertilization for higher fresh root yielde7
- Value
- F1e7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Cassava Genotypes”
e7“The economic rate of fertilization for higher fresh root yield of all other genotypes except Debor is F1”
Claim · model-written summary
Sisipe 290 had the highest starch content at the F1 fertilizer treatment.
- Taxon
- cassavaManihot esculentat0
- Material
- Sisipe 290e0
- Treatment
- F1 fertilizer treatmente0
- Outcome
- starch contente0
- Direction
- higheste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Cassava Genotypes”
e0“Sisipe 290 had the highest starch content at the F1 fertilizer treatment”
Claim · model-written summary
Fertilizer rates of 60N, 120N and 180N per ha are recommended for higher fresh root yields of the five genotypes.
- Taxon
- cassavaManihot esculentat0
- Material
- Afebankye and Tuaka, Afisafi and Debore1
- Outcome
- higher fresh root yieldse1
- Value
- 60N – 30 P2O5 – 90 K2O kg/ha (F1)e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Cassava Genotypes”
e1“For higher fresh root yields, 60N – 30 P2O5 – 90 K2O kg/ha (F1), 120N – 60 P2O5 – 180 K2O kg/ha (F2) and 180N – 90 P2O5 – 270 K2O kg/ha (F3) are recommended for Afebankye and Tuaka, Afisafi and Debor respectively”
Claim · model-written summary
Rate F1 is recommended for starch content of Debor, Afisafi and Sisipe 290.
- Taxon
- cassavaManihot esculentat0
- Material
- Debor, Afisafi and Sisipe 290e2
- Outcome
- starch contente2
- Value
- 60N – 30 P2O5 – 90 K2O kg/ha (F1 )e2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Cassava Genotypes”
e2“With regards to starch content, 60N – 30 P2O5 – 90 K2O kg/ha (F1 ) rate is recommended for Debor, Afisafi and Sisipe 290”
The same questions in other papers
fertilization · yield · Manihot esculenta (cassava)Positive and negative results
140 papers in the same direction as this paper · 10 in the opposite direction · 2 reporting no difference from an alternative
- no effect
- positive
- negative
149 papers more in this group
See all 153 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.