Abstract
Grain sorghum [ Sorghum bicolor (L.) Moench] is an important crop in semiarid regions of the world because of its drought tolerance. Nitrogen is one of the most limiting nutrients in crop production due to low availability and loss. We hypothesize that there are differences in physiological and yield traits among grain sorghum genotypes in response to N. The objectives of this study were to determine the responses of sorghum genotypes (hybrids and inbred lines) to N fertilizer and the relationship between their physiological and yield traits. Field experiments were conducted at two locations in Kansas for two seasons (2010 and 2011). Genotype × N regimes and year × genotype interactions were significant for leaf chlorophyll, aboveground biomass, grain yield, and seed number. Overall, the hybrids were superior to inbred lines for grain yield and total aboveground biomass, but grain yields of inbred lines TX2783 and TX7000 were comparable to hybrids. Maximum total aboveground biomass, leaf chlorophyll index, and grain yield were obtained at 90 kg N ha −1 . Across years, application of 45 and 90 kg N ha −1 resulted in an increase in yield of 13 and 48% over 0 kg N ha −1 , respectively. No strong relationship was detected between genotypes and leaf chlorophyll index or chlorophyll a fluorescence and grain yield, but there was a strong relationship between seed number and total aboveground biomass and grain yield. Leaf chlorophyll index and chlorophyll a fluorescence did not provide physiological basis for differences in N response among the genotypes for grain yield.
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Claims 8
Claim · model-written summary
Hybrids were superior to inbred lines for grain yield and total aboveground biomass.
- Taxon
- Sorghum bicolor
Sorghum bicolore1 - Material
- hybridse2
- Outcome
- grain yield and total aboveground biomasse2
- Direction
- superiore2
- Comparator
- inbred linese2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Grain sorghum [ Sorghum bicolor (L.) Moench] is an important crop in semiarid regions”
e2“Overall, the hybrids were superior to inbred lines for grain yield and total aboveground biomass”
Claim · model-written summary
Grain yields of inbred lines TX2783 and TX7000 were comparable to those of hybrids.
- Taxon
- Sorghum bicolorSorghum bicolore1
- Material
- TX2783 and TX7000e3
- Outcome
- grain yieldse3
- Direction
- comparablee3
- Comparator
- hybridse3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Grain sorghum [ Sorghum bicolor (L.) Moench] is an important crop in semiarid regions”
e3“grain yields of inbred lines TX2783 and TX7000 were comparable to hybrids”
Claim · model-written summary
Maximum total aboveground biomass, leaf chlorophyll index and grain yield were obtained at 90 kg N ha −1.
- Taxon
- Sorghum bicolorSorghum bicolore1
- Treatment
- 90 kg N ha −1e4
- Outcome
- total aboveground biomass, leaf chlorophyll index, and grain yielde4
- Direction
- Maximume4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Grain sorghum [ Sorghum bicolor (L.) Moench] is an important crop in semiarid regions”
e4“Maximum total aboveground biomass, leaf chlorophyll index, and grain yield were obtained at 90 kg N ha −1”
Claim · model-written summary
Across years, 45 kg N ha −1 increased grain yield by 13% over 0 kg N ha −1.
- Taxon
- Sorghum bicolorSorghum bicolore1
- Treatment
- application of 45 and 90 kg N ha −1e5
- Outcome
- yielde5
- Direction
- increasee5
- Value
- 13e5
- Comparator
- 0 kg N ha −1e5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Grain sorghum [ Sorghum bicolor (L.) Moench] is an important crop in semiarid regions”
e5“Across years, application of 45 and 90 kg N ha −1 resulted in an increase in yield of 13 and 48% over 0 kg N ha −1 , respectively”
Claim · model-written summary
Across years, 90 kg N ha −1 increased grain yield by 48% over 0 kg N ha −1.
- Taxon
- Sorghum bicolorSorghum bicolore1
- Treatment
- application of 45 and 90 kg N ha −1e5
- Outcome
- yielde5
- Direction
- increasee5
- Value
- 48%e5
- Comparator
- 0 kg N ha −1e5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Grain sorghum [ Sorghum bicolor (L.) Moench] is an important crop in semiarid regions”
e5“Across years, application of 45 and 90 kg N ha −1 resulted in an increase in yield of 13 and 48% over 0 kg N ha −1 , respectively”
Claim · model-written summary
No strong relationship was detected between genotypes and leaf chlorophyll index or chlorophyll a fluorescence, or grain yield.
- Taxon
- Sorghum bicolorSorghum bicolore1
- Material
- genotypese6
- Outcome
- grain yielde6
- Qualifier
- leaf chlorophyll index or chlorophyll a fluorescencee6
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Grain sorghum [ Sorghum bicolor (L.) Moench] is an important crop in semiarid regions”
e6“No strong relationship was detected between genotypes and leaf chlorophyll index or chlorophyll a fluorescence and grain yield”
Claim · model-written summary
Seed number had a strong relationship with total aboveground biomass and grain yield.
- Taxon
- Sorghum bicolorSorghum bicolore1
- Organ / stage
- seed numbere7
- Outcome
- total aboveground biomass and grain yielde7
- Qualifier
- strong relationshipe7
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Grain sorghum [ Sorghum bicolor (L.) Moench] is an important crop in semiarid regions”
e7“there was a strong relationship between seed number and total aboveground biomass and grain yield”
Claim · model-written summary
Leaf chlorophyll index and chlorophyll a fluorescence did not explain differences in N response among genotypes for grain yield.
- Taxon
- Sorghum bicolorSorghum bicolore1
- Material
- genotypese0
- Outcome
- differences in N responsee0
- Qualifier
- did not provide physiological basise0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Grain sorghum [ Sorghum bicolor (L.) Moench] is an important crop in semiarid regions”
e0“Leaf chlorophyll index and chlorophyll a fluorescence did not provide physiological basis for differences in N response among the genotypes for grain yield”
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