Abstract
The effects of N rates, in different proportions, at different growth stages were evaluated on lowland rice varieties in a derived Savannah of Nigeria. Field experiments (2020 and 2021) were conducted at the Teaching and Research Farms, Federal University of Agriculture, Abeokuta. Nitrogen rates (0, 60, 90 and 120 kg N ha−1), variations in its proportion at different growth stages [50% transplanting (TP) + 50% tillering (TL), 50% TP + 25% TL + 25% panicle initiation (PI), 33.3% TP + 33.3% TL +33.3 PI] and varieties (NERICA L-19 and WITA 4) were in the main plot, sub plot and sub-sub plot, respectively. The experiments were in split-split design with three replicates. Data were subjected to Analysis of Variance, treatment means were separated using Least Significant Difference at 5% probability level. Increasing N rates significantly increased leaf assimilatory surface, shoot dry weight (SDW), and sink size. Partial Factor Productivity of N (PFPN) was in the order 60 > 90 and 120 kg N ha−1. Growth and sink size of rice were significantly higher when sown with N in the proportion 33.3% (TR+TL+PI) than others. WITA 4 had significantly higher Agronomic Use efficiency of N and Physiological Efficiency of N (2020), SDW, plant height and 1000-grain weight than NERICA L-19. Grain yield was favored at increasing application of N, optimum PFPN was at 60 kg N ha−1. Nitrogen applied in the proportion 33.3% (TR+TL+PI) improves the sink size. WITA 4 is desirable in this agroecology considering its N use efficiency.
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Claims 7
Claim · model-written summary
Increasing nitrogen rates significantly increased leaf assimilatory surface, shoot dry weight and sink size.
- Taxon
- lowland ricet0
- Treatment
- Increasing N ratese0
- Outcome
- leaf assimilatory surface, shoot dry weight (SDW), and sink sizee0
- Direction
- increasede0
Not reportedComparator
Verbatim
e0“Increasing N rates significantly increased leaf assimilatory surface, shoot dry weight (SDW), and sink size.”
t0“lowland rice varieties”
Claim · model-written summary
Partial Factor Productivity of N was highest at 60 kg N ha−1.
Verbatim
e0“Partial Factor Productivity of N (PFPN) was in the order 60 > 90 and 120 kg N ha−1.”
e1“Nitrogen rates (0, 60, 90 and 120 kg N ha−1)”
t0“lowland rice varieties”
Claim · model-written summary
Equal thirds of nitrogen at growth stages gave higher rice growth and sink size.
- Taxon
- rice
Oryza sativae0 - Treatment
- N in the proportion 33.3% (TR+TL+PI)e0
- Outcome
- Growth and sink sizee0
- Direction
- highere0
- Comparator
- otherse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Growth and sink size of rice were significantly higher when sown with N in the proportion 33.3% (TR+TL+PI) than others.”
Claim · model-written summary
WITA 4 had higher agronomic and physiological N use efficiency than NERICA L-19.
Verbatim
e0“WITA 4 had significantly higher Agronomic Use efficiency of N and Physiological Efficiency of N (2020), SDW, plant height and 1000-grain weight than NERICA L-19.”
t0“lowland rice varieties”
Claim · model-written summary
WITA 4 had higher shoot dry weight, plant height and thousand grain weight than NERICA L-19.
Verbatim
e0“WITA 4 had significantly higher Agronomic Use efficiency of N and Physiological Efficiency of N (2020), SDW, plant height and 1000-grain weight than NERICA L-19.”
t0“lowland rice varieties”
Claim · model-written summary
Grain yield was favored by increasing nitrogen application.
Not reportedComparator
Verbatim
e0“Grain yield was favored at increasing application of N”
t0“lowland rice varieties”
Claim · model-written summary
WITA 4 was recommended for its nitrogen use efficiency in this agroecology.
Verbatim
e0“WITA 4 is desirable in this agroecology considering its N use efficiency.”
t0“lowland rice varieties”
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