Abstract
Abstract Lowland rice is a staple food for more than 50% of the world's population and phosphorus (P) deficiency is one of the main constraints in rice production in tropical lowlands. A field experiment was conducted for two years consecutive with the objective to evaluate 12 lowland rice genotypes for P use efficiency. The P rates used were 0, 22, 44, 66, and 88 kg P ha−1 (0, 50, 100, 150 and 200 kg P2O5 ha−1) applied to an Inceptisol. The genotypes used were BRS Jaçanã, CNAi 8860, BRS Fronteira, CNAi 8879, CNAi 8880, CNAi 8886, CNAi 8885, CNAi 8569, BRSGO Guará, BRS Alvorada, BRS Jaburu and BRS Biguá. There were significant and quadratic responses of genotypes to phosphorus fertilization. Adequate P rates for maximum grain yield varied from genotype to genotype. However, across 12 genotypes, maximum grain yield was obtained with the application of 54 kg P ha−1. Genotype BRS Jaçanã was most efficient and genotype CNAi 8569 was most inefficient in P use efficiency. Shoot dry weight and panicle number was also increased significantly and quadratically with increasing P rates in the range of 0 to 88 kg P ha−1. These two plant parameters were positively associated with grain yield. Agronomic efficiency (kg grain produced per kg P applied) was significantly decreased with increasing P rates in the range of 22 to 88 kg P ha−1. Keywords: agronomic efficiencygrain yieldInceptisolyield components
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Claims 8
Claim · model-written summary
Lowland rice genotypes responded significantly and quadratically to phosphorus fertilization.
- Taxon
- rice
Oryza sativat0 - Treatment
- phosphorus fertilizatione1
- Outcome
- responses of genotypese1
- Qualifier
- quadratice1
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“LOWLAND RICE GENOTYPES”
e1“There were significant and quadratic responses of genotypes to phosphorus fertilization”
Claim · model-written summary
Adequate phosphorus rates for maximum grain yield varied from genotype to genotype.
- Taxon
- riceOryza sativat0
- Outcome
- Adequate P rates for maximum grain yielde2
- Qualifier
- varied from genotype to genotypee2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“LOWLAND RICE GENOTYPES”
e2“Adequate P rates for maximum grain yield varied from genotype to genotype”
Claim · model-written summary
Across 12 genotypes, maximum grain yield was obtained with the application of 54 kg P ha−1.
- Taxon
- riceOryza sativat0
- Treatment
- the application of 54 kg P ha−1e3
- Outcome
- maximum grain yielde3
- Direction
- maximume3
- Value
- 54 kg P ha−1e3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“LOWLAND RICE GENOTYPES”
e3“maximum grain yield was obtained with the application of 54 kg P ha−1”
Claim · model-written summary
Genotype BRS Jaçanã was the most efficient genotype in P use efficiency.
- Taxon
- riceOryza sativat0
- Material
- BRS Jaçanãe4
- Outcome
- P use efficiencye4
- Direction
- most efficiente4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“LOWLAND RICE GENOTYPES”
e4“Genotype BRS Jaçanã was most efficient and genotype CNAi 8569 was most inefficient in P use efficiency”
Claim · model-written summary
Genotype CNAi 8569 was the most inefficient genotype in P use efficiency.
- Taxon
- riceOryza sativat0
- Material
- CNAi 8569e4
- Outcome
- P use efficiencye4
- Direction
- most inefficiente4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“LOWLAND RICE GENOTYPES”
e4“Genotype BRS Jaçanã was most efficient and genotype CNAi 8569 was most inefficient in P use efficiency”
Claim · model-written summary
Shoot dry weight and panicle number increased significantly and quadratically with P rates from 0 to 88 kg P ha−1.
- Taxon
- riceOryza sativat0
- Treatment
- increasing P rates in the range of 0 to 88 kg P ha−1e5
- Outcome
- Shoot dry weight and panicle numbere5
- Direction
- increasede5
- Qualifier
- quadraticallye5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“LOWLAND RICE GENOTYPES”
e5“Shoot dry weight and panicle number was also increased significantly and quadratically with increasing P rates in the range of 0 to 88 kg P ha−1”
Claim · model-written summary
Shoot dry weight and panicle number were positively associated with grain yield.
- Taxon
- riceOryza sativat0
- Organ / stage
- Shoote5
- Outcome
- grain yielde6
- Direction
- positively associatede6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“LOWLAND RICE GENOTYPES”
e5“Shoot dry weight and panicle number was also increased significantly and quadratically with increasing P rates in the range of 0 to 88 kg P ha−1”
e6“These two plant parameters were positively associated with grain yield”
Claim · model-written summary
Agronomic efficiency decreased significantly with P rates from 22 to 88 kg P ha−1.
- Taxon
- riceOryza sativat0
- Treatment
- increasing P rates in the range of 22 to 88 kg P ha−1e7
- Outcome
- Agronomic efficiencye7
- Direction
- decreasede7
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“LOWLAND RICE GENOTYPES”
e7“Agronomic efficiency (kg grain produced per kg P applied) was significantly decreased with increasing P rates in the range of 22 to 88 kg P ha−1”
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See all 475 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.