Abstract
An experiment was conducted at the Savanna Agricultural Research Institute on a Euteric Gleisol on latitude 9 - 25 - 41” N longitude O - 58’ 42”W in the Guinea Savanna Zone of West Africa, Ghana. The objective was to establish the responses of the lowland “New Rice for Africa” (NERICA) and Sativa varieties for recommendation of optimum N and P rates. Six lowland NERICAs, three Oryza sativa and one Oryza glaberima lines were used. Number of tillers/m 2 quadrant and shoot dry biomass /15cm 2 was used to evaluate the P/N response of crop performance. For the dry biomass weight, destructive sampling was done at the 50% flowering stage. The Phosphorus and Nitrogen fertilizers rates were 0, 13, 26 kg P/ha and 0, 30, 60, 120 kg N/ha respectively. Potassium was applied at a uniform rate of 30 kg K 2 O/ha to all plots before planting. The average days of 50% flowering and 80 % maturity of all varieties used, counting from seedling emergence, were 73 to 82 days and 104 to 113 days respectively. There were significant differences on the effect of P and N - levels on shoot – biomass/15 cm 2 quadrant ( p< 0.05 ) but number of tillers/ m 2 quadrant were not ( p > 0.05 ). The interaction of P/N fertilizer levels by variety was highly significant ( p < 0.001 ). Increasing N levels increased biomass and tillers more markedly than increasing P - levels. It was noted that P may have been fixed because available Bray 1 P was not appreciably higher in the 26 kg P/ ha plots than 0 kg P/ha. It could have been due to the oxidation of Iron (II) to Iron (III) resulting in insoluble Iron (III) Phosphate complexes or by formation of complex insoluble Aluminium (III) phosphates. Varieties such as V1, V2, V3, V8 and V9 were responsive to lower P and N inputs such as P0/N0 or P0/N30 and also to moderate inputs such as P13/N30, P26/N30 or P13/N60. Varieties such as, V4, V5 and V6 are not responsive to lower inputs but were very responsive to the higher inputs outlined above. Phosphorus and Nitrogen main plots pool for two years at high input rate, (P26/N60 and P26/N120 ), has no significant advantage over the lower ( P0/N0 or P0/N30, P13/N0, P13/N30 ) and moderate combinations, ( P13/N60, P13/120 ) as regards biomass yields ( p .> 0. 05 ).
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Claims 12
Claim · model-written summary
Rice lines reached 50% flowering at 73 to 82 days after emergence.
- Taxon
- rice
Oryza sativat0 - Organ / stage
- 50% floweringe0
- Outcome
- average days of 50% floweringe0
- Value
- 73 to 82 dayse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The average days of 50% flowering and 80 % maturity of all varieties used, counting from seedling emergence, were 73 to 82 days and 104 to 113 days respectively.”
t0“rice lines”
Claim · model-written summary
Rice lines reached 80% maturity at 104 to 113 days after emergence.
- Taxon
- riceOryza sativat0
- Organ / stage
- 80 % maturitye0
- Outcome
- 80 % maturitye0
- Value
- 104 to 113 dayse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The average days of 50% flowering and 80 % maturity of all varieties used, counting from seedling emergence, were 73 to 82 days and 104 to 113 days respectively.”
t0“rice lines”
Claim · model-written summary
Phosphorus and nitrogen levels significantly affected rice shoot biomass.
- Taxon
- riceOryza sativat0
- Treatment
- P and N - levelse0
- Outcome
- shoot – biomass/15 cm 2 quadrante0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There were significant differences on the effect of P and N - levels on shoot – biomass/15 cm 2 quadrant ( p< 0.05 )”
t0“rice lines”
Claim · model-written summary
Phosphorus and nitrogen levels did not significantly affect tiller number.
- Taxon
- riceOryza sativat0
- Treatment
- P and N - levelse1
- Outcome
- number of tillers/ m 2 quadrante0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“number of tillers/ m 2 quadrant were not ( p > 0.05 )”
e1“effect of P and N - levels”
t0“rice lines”
Claim · model-written summary
The interaction of fertilizer levels with rice variety was highly significant.
- Taxon
- riceOryza sativat0
- Material
- varietye0
- Treatment
- P/N fertilizer levelse0
- Outcome
- interaction of P/N fertilizer levels by varietye0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The interaction of P/N fertilizer levels by variety was highly significant ( p < 0.001 ).”
t0“rice lines”
Claim · model-written summary
Increasing nitrogen raised rice biomass more markedly than increasing phosphorus.
- Taxon
- riceOryza sativat0
- Treatment
- Increasing N levelse0
- Outcome
- biomasse0
- Direction
- increasede0
- Comparator
- increasing P - levelse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increasing N levels increased biomass and tillers more markedly than increasing P - levels.”
t0“rice lines”
Claim · model-written summary
Increasing nitrogen raised rice tillers more markedly than increasing phosphorus.
- Taxon
- riceOryza sativat0
- Treatment
- Increasing N levelse0
- Outcome
- tillerse0
- Direction
- increasede0
- Comparator
- increasing P - levelse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increasing N levels increased biomass and tillers more markedly than increasing P - levels.”
t0“rice lines”
Claim · model-written summary
Bray 1 P was not appreciably higher in 26 kg P/ha plots than 0 kg P/ha plots.
- Taxon
- riceOryza sativat0
- Treatment
- 26 kg P/ hae0
- Outcome
- available Bray 1 Pe0
- Direction
- not appreciably highere0
- Comparator
- 0 kg P/hae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“available Bray 1 P was not appreciably higher in the 26 kg P/ ha plots than 0 kg P/ha.”
t0“rice lines”
Claim · model-written summary
V1, V2 and V3 were responsive to lower and moderate fertilizer inputs.
- Taxon
- riceOryza sativat0
- Material
- V1, V2, V3e0
- Outcome
- responsive to lower P and N inputse0
- Qualifier
- moderate inputse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Varieties such as V1, V2, V3, V8 and V9 were responsive to lower P and N inputs such as P0/N0 or P0/N30 and also to moderate inputs such as P13/N30, P26/N30 or P13/N60.”
t0“rice lines”
Claim · model-written summary
V8 and V9 were responsive to lower and moderate fertilizer inputs.
- Taxon
- riceOryza sativat0
- Material
- V8 and V9e0
- Outcome
- responsive to lower P and N inputse0
- Qualifier
- moderate inputse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Varieties such as V1, V2, V3, V8 and V9 were responsive to lower P and N inputs such as P0/N0 or P0/N30 and also to moderate inputs such as P13/N30, P26/N30 or P13/N60.”
t0“rice lines”
Claim · model-written summary
V4, V5 and V6 were unresponsive to lower inputs but highly responsive to higher inputs.
- Taxon
- riceOryza sativat0
- Material
- V4, V5 and V6e0
- Outcome
- not responsive to lower inputs but were very responsive to the higher inputse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Varieties such as, V4, V5 and V6 are not responsive to lower inputs but were very responsive to the higher inputs outlined above.”
t0“rice lines”
Claim · model-written summary
High phosphorus and nitrogen input had no significant biomass yield advantage over lower and moderate combinations over two years.
- Taxon
- riceOryza sativat0
- Treatment
- P26/N60 and P26/N120e0
- Outcome
- biomass yieldse0
- Direction
- no significant advantagee0
- Qualifier
- for two yearse0
- Comparator
- lowere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Phosphorus and Nitrogen main plots pool for two years at high input rate, (P26/N60 and P26/N120 ), has no significant advantage over the lower ( P0/N0 or P0/N30, P13/N0, P13/N30 ) and moderate combinations, ( P13/N60, P13/120 ) as regards biomass yields ( p .> 0. 05 ).”
t0“rice lines”
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