Abstract
Upland rice is an important crop in South American cropping systems. In Brazil it is mainly grown in the central area, locally known as the Cerrado region. Soils of the Cerrado region are acidic and have poor fertility. A greenhouse experiment was conducted with the objective to evaluate thirty upland rice genotypes for acidity tolerance. Two acidity levels were created: high (without lime addition) and low (addition of 2.5 g dolomitic lime per kg soil). Plant height, straw yield, grain yield, panicle number, thousand-grain weight, spikelet sterility, grain harvest index (GHI), maximum root length, and root dry weight were significantly influenced by lime and genotype treatments. Lime × genotype interactions were also significant for most of these traits, indicating variation in these treats with the variation in acidity levels. Based on grain yield acidity tolerance index (GYATI), genotypes were classified as tolerant, moderately tolerant, and susceptible to soil acidity. Among thirty genotypes, 30 percent were classified as tolerant, 53 percent were classified as moderately tolerant, and 17 percent were classified as susceptible to soil acidity. Most of the growth, yield, and yield components had significant quadratic positive association with grain yield across two acidity levels. Soil acidity indices such as pH, base saturation, calcium (Ca) saturation, magnesium (Mg) saturation, and potassium (K) saturation increased with the addition of lime. Phosphorus content also increased with the addition of lime. However, hydrogen and aluminum (H + Al) and iron (Fe) content decreased with the addition of lime. Adequate soil acidity indices for grain yield were established.
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Claims 10
Claim · model-written summary
Lime and genotype treatments significantly affected plant height, straw and grain yields, panicle number, thousand-grain weight, spikelet sterility, grain harvest index, root length and root dry weight.
- Taxon
- Rice
Oryza sativat0 - Treatment
- lime and genotype treatmentse0
- Outcome
- Plant height, straw yield, grain yield, panicle number, thousand-grain weight, spikelet sterility, grain harvest index (GHI), maximum root length, and root dry weighte0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plant height, straw yield, grain yield, panicle number, thousand-grain weight, spikelet sterility, grain harvest index (GHI), maximum root length, and root dry weight were significantly influenced by lime and genotype treatments”
t0“Upland Rice”
Claim · model-written summary
Lime by genotype interactions were significant for most measured traits.
- Taxon
- RiceOryza sativat0
- Treatment
- Lime × genotype interactionse0
- Outcome
- most of these traitse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Lime × genotype interactions were also significant for most of these traits”
t0“Upland Rice”
Claim · model-written summary
Thirty percent of genotypes were classified tolerant to soil acidity.
- Taxon
- RiceOryza sativat0
- Outcome
- tolerante0
- Value
- 30 percente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“30 percent were classified as tolerant”
t0“Upland Rice”
Claim · model-written summary
Fifty-three percent of genotypes were moderately tolerant to soil acidity.
- Taxon
- RiceOryza sativat0
- Outcome
- moderately tolerante0
- Value
- 53 percente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“53 percent were classified as moderately tolerant”
t0“Upland Rice”
Claim · model-written summary
Seventeen percent of genotypes were susceptible to soil acidity.
- Taxon
- RiceOryza sativat0
- Outcome
- susceptible to soil aciditye0
- Value
- 17 percente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“17 percent were classified as susceptible to soil acidity”
t0“Upland Rice”
Claim · model-written summary
Most growth, yield and yield components had a significant quadratic positive association with grain yield.
- Taxon
- RiceOryza sativat0
- Organ / stage
- growth, yield, and yield componentse0
- Outcome
- grain yielde0
- Direction
- positivee0
- Qualifier
- across two acidity levelse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Most of the growth, yield, and yield components had significant quadratic positive association with grain yield across two acidity levels”
t0“Upland Rice”
Claim · model-written summary
Soil pH and base, calcium, magnesium and potassium saturation increased with lime.
- Taxon
- RiceOryza sativat0
- Treatment
- addition of limee0
- Outcome
- Soil acidity indices such as pH, base saturation, calcium (Ca) saturation, magnesium (Mg) saturation, and potassium (K) saturatione0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Soil acidity indices such as pH, base saturation, calcium (Ca) saturation, magnesium (Mg) saturation, and potassium (K) saturation increased with the addition of lime”
t0“Upland Rice”
Claim · model-written summary
Soil phosphorus content increased with lime.
- Taxon
- RiceOryza sativat0
- Treatment
- addition of limee0
- Outcome
- Phosphorus contente0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Phosphorus content also increased with the addition of lime”
t0“Upland Rice”
Claim · model-written summary
Soil hydrogen and aluminum and iron content decreased with lime.
- Taxon
- RiceOryza sativat0
- Treatment
- addition of limee0
- Outcome
- hydrogen and aluminum (H + Al) and iron (Fe) contente0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“hydrogen and aluminum (H + Al) and iron (Fe) content decreased with the addition of lime”
t0“Upland Rice”
Claim · model-written summary
The study established adequate soil acidity indices for grain yield.
- Taxon
- RiceOryza sativat0
- Outcome
- soil acidity indices for grain yielde0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Adequate soil acidity indices for grain yield were established”
t0“Upland Rice”
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See all 8 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.