Abstract
Field experiments were conducted to investigate the effects of application and residues of organomineral and NPK fertilizers on two cassava varieties in a tropical alfisol in Ibadan, southwestern Nigeria in 2007, 2008 and 2009. Five Organomineral Fertilizer (OF) rates (1.5, 2.5, 3.5, 4.5 and 6.0 t/ha), NPK 15-15-15 at 600 kg/ha and no fertilizer (control) treatments as subplots were evaluated on the performance of TMS 30572 and TMS 92/0326 planted at 10,000 plants per hectare as main plots. Fertilizer was applied at planting using a split plot arrangement in a Randomized Complete Block Design (RCBD) with three replicates. After harvest at 12 Months After Planting (MAP), cassava was replanted in-situ with minimum soil disturbance, without fertilizer application to assess the residual effects of previously applied treatments. Fertilizer application significantly increased cassava root yield but had no significant influence on plant growth parameters and number of storage roots per plant. Yield obtained with NPK application was similar to those obtained with various OF rates. Residues of OF applied at 2.5 to 6.0 t/ha produced yields similar to those of previous application. Fresh and dry root yields of NPK and control treatments were significantly low. The optimum OF rate (2.5 t/ha) is capable of producing optimum cassava root yields in two consecutive cropping seasons.
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Claims 6
Claim · model-written summary
Fertilizer application significantly increased cassava root yield.
- Taxon
- cassava
Manihot esculentae1 - Treatment
- Fertilizer applicatione1
- Outcome
- root yielde1
- Direction
- increasede1
- Setting
- Ibadan, southwestern Nigeriat0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Fertilizer application significantly increased cassava root yield but had no significant influence on plant growth parameters and number of storage roots per plant”
t0“two cassava varieties in Ibadan, southwestern Nigeria”
Claim · model-written summary
Fertilizer application had no significant influence on cassava plant growth parameters or storage root number.
- Taxon
- cassavaManihot esculentae1
- Treatment
- Fertilizer applicatione1
- Outcome
- plant growth parameters and number of storage roots per plante1
- Direction
- no significant influencee1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Fertilizer application significantly increased cassava root yield but had no significant influence on plant growth parameters and number of storage roots per plant”
Claim · model-written summary
NPK application gave cassava yield similar to various organomineral rates.
- Taxon
- cassavaManihot esculentat0
- Treatment
- NPK applicatione2
- Outcome
- Yielde2
- Direction
- similare2
- Comparator
- various OF ratese2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“two cassava varieties in Ibadan, southwestern Nigeria”
e2“Yield obtained with NPK application was similar to those obtained with various OF rates”
Claim · model-written summary
Residues of organomineral fertilizer at 2.5 to 6.0 t/ha gave cassava yields similar to those of the previous application.
- Taxon
- cassavaManihot esculentat0
- Treatment
- Residues of OF applied at 2.5 to 6.0 t/hae3
- Outcome
- yieldse3
- Direction
- similare3
- Comparator
- those of previous applicatione3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“two cassava varieties in Ibadan, southwestern Nigeria”
e3“Residues of OF applied at 2.5 to 6.0 t/ha produced yields similar to those of previous application”
Claim · model-written summary
Fresh and dry cassava root yields under NPK and control treatments were significantly low.
- Taxon
- cassavaManihot esculentat0
- Treatment
- NPK and control treatmentse4
- Outcome
- Fresh and dry root yieldse4
- Direction
- significantly lowe4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“two cassava varieties in Ibadan, southwestern Nigeria”
e4“Fresh and dry root yields of NPK and control treatments were significantly low”
Claim · model-written summary
An organomineral fertilizer rate of 2.5 t/ha can produce optimum cassava root yields over two consecutive cropping seasons.
- Taxon
- cassavaManihot esculentae5
- Treatment
- OF rate (2.5 t/ha)e5
- Outcome
- optimum cassava root yieldse5
- Qualifier
- in two consecutive cropping seasonse5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“The optimum OF rate (2.5 t/ha) is capable of producing optimum cassava root yields in two consecutive cropping seasons”
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