Abstract
Summary A series of N × P field experiments with irrigated rice, conducted over the period 1958–1962 on the same plots on alluvial soils considered representative for most of the bottom ‘fadama’ land in Niger and Ilorin Provinces, Northern Nigeria, showed small increases with medium dressings of P 2 O 5 and large responses with high dressings of N. The N responses showed considerable variation between soil types and years. The variation between soil types was attributed to different cation exchange capacities, which resulted in NH 4 ′ leaching from the root zone at different rates. The variation in N responses between years was probably due to different physiological timings of the top dressings. Results of chemical analyses of straw and grain samples of the 1961 crop were used to estimate the percentage of N and P 2 O 5 recovered by the crop with the various treatments over the untreated plots in the previous years of the experiments on two soil types. The recovery percentages for the different levels of N on the clay ‘basin’ soils were moderate, about 18 per cent, whereas those for the sandy ‘levee’ soils were lower, averaging only 9 per cent. Recovery of P 2 O 5 varied from good at medium N levels (14 per cent) to moderate at high N levels (9 per cent) on the basin soils. Recovery of P 2 O 5 on the levee soils was poor. The utilisation of the recovered N (75 lb paddy/lb N) and P 2 O 5 (42 lb paddy/lb P 2 O 5 ) was very good for N and fair for P 2 O 5 .
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Claims 10
Claim · model-written summary
Medium phosphorus dressings gave small rice yield increases.
- Taxon
- rice
Oryza sativat0 - Treatment
- medium dressings of P 2 O 5e0
- Outcome
- small increasese0
- Direction
- increasese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“showed small increases with medium dressings of P 2 O 5”
t0“Rice”
Claim · model-written summary
High nitrogen dressings gave large rice responses.
- Taxon
- riceOryza sativat0
- Treatment
- high dressings of Ne0
- Outcome
- large responsese0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“large responses with high dressings of N”
t0“Rice”
Claim · model-written summary
Nitrogen response varied across soil types and years.
- Taxon
- riceOryza sativat0
- Outcome
- N responsese0
- Qualifier
- variation between soil types and yearse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The N responses showed considerable variation between soil types and years”
t0“Rice”
Claim · model-written summary
Nitrogen recovery on basin clay soils was about 18 per cent.
- Taxon
- riceOryza sativat0
- Outcome
- recovery percentagese0
- Value
- 18 per cente0
- Setting
- clay ‘basin’ soilse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The recovery percentages for the different levels of N on the clay ‘basin’ soils were moderate, about 18 per cent”
t0“Rice”
Claim · model-written summary
Nitrogen recovery on levee sandy soils averaged 9 per cent.
- Taxon
- riceOryza sativat0
- Outcome
- recovery percentagese0
- Direction
- lowere0
- Value
- 9 per cente0
- Setting
- sandy ‘levee’ soilse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The recovery percentages for the different levels of N on the clay ‘basin’ soils were moderate, about 18 per cent, whereas those for the sandy ‘levee’ soils were lower, averaging only 9 per cent”
t0“Rice”
Claim · model-written summary
Phosphorus recovery on basin soils was 14 per cent at medium nitrogen.
- Taxon
- riceOryza sativat0
- Outcome
- Recovery of P 2 O 5e0
- Value
- 14 per cente0
- Qualifier
- medium N levelse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Recovery of P 2 O 5 varied from good at medium N levels (14 per cent)”
t0“Rice”
Claim · model-written summary
Phosphorus recovery on basin soils was 9 per cent at high nitrogen.
- Taxon
- riceOryza sativat0
- Outcome
- Recovery of P 2 O 5e0
- Value
- 9 per cente0
- Qualifier
- high N levelse0
- Setting
- basin soilse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Recovery of P 2 O 5 varied from good at medium N levels (14 per cent) to moderate at high N levels (9 per cent) on the basin soils”
t0“Rice”
Claim · model-written summary
Phosphorus recovery was poor on levee soils.
- Taxon
- riceOryza sativat0
- Outcome
- Recovery of P 2 O 5e0
- Setting
- levee soilse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Recovery of P 2 O 5 on the levee soils was poor”
t0“Rice”
Claim · model-written summary
Recovered nitrogen utilization was 75 lb paddy/lb N.
- Taxon
- riceOryza sativat0
- Outcome
- recovered Ne0
- Value
- 75 lb paddy/lb Ne0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“recovered N (75 lb paddy/lb N)”
t0“Rice”
Claim · model-written summary
Recovered phosphorus utilization was 42 lb paddy/lb P 2 O 5.
- Taxon
- riceOryza sativat0
- Outcome
- P 2 O 5e0
- Value
- 42 lb paddy/lb P 2 O 5e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“P 2 O 5 (42 lb paddy/lb P 2 O 5 )”
t0“Rice”