Quantifying the Agronomic and Economic Performance of Hybrid and Conventional Rice Varieties

Nalley, Lawton Lanier; Tack, Jesse; Barkley, Andrew; Jagadish, Krishna S.V.; Brye, Kristofor R.

doi:10.2134/agronj2015.0526

Cited by 31 publications

(25 citation statements)

References 30 publications

(47 reference statements)

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“…This action was taken primarily because the university test plots administered by Louisiana State University did not grow hybrid lines continuously throughout the study's timeframe (2002)(2003)(2004)(2005)(2006)(2007)(2008)(2009)(2010)(2011)(2012)(2013); as such, these data could not be estimated. Consequently, the results from Nalley et al (2016) that were used in our study are conservative in their estimation of the total gains in the MidSouth, given that Louisiana produced 15% of the total US rice crop in 2015, whereas Arkansas produced 51% and Mississippi produced 6% (USDA-ERS, 2015). Nalley et al (2016) …”

Section: Value Of Genetic Gainmentioning

confidence: 93%

“…Consequently, the results from Nalley et al (2016) that were used in our study are conservative in their estimation of the total gains in the MidSouth, given that Louisiana produced 15% of the total US rice crop in 2015, whereas Arkansas produced 51% and Mississippi produced 6% (USDA-ERS, 2015). Nalley et al (2016) …”

Section: Value Of Genetic Gainmentioning

confidence: 93%

“…Results from Nalley et al (2016) were used to estimate the genetic gain associated with hybrid adoption in the Mid-South. The objective of their study was to quantify the economic performance of hybrid and conventional rice in the MidSouth.…”

Section: Value Of Genetic Gainmentioning

confidence: 99%

“…This objective, in partnership with their modeling approach, complemented the research goals of our study. Unlike the previously mentioned blast model, Nalley et al (2016) only estimated the amount and dollar value of heterosis for Arkansas and Mississippi, not Louisiana. This action was taken primarily because the university test plots administered by Louisiana State University did not grow hybrid lines continuously throughout the study's timeframe (2002)(2003)(2004)(2005)(2006)(2007)(2008)(2009)(2010)(2011)(2012)(2013); as such, these data could not be estimated.…”

Section: Value Of Genetic Gainmentioning

confidence: 99%

“…Previous research in the Mid-South (Arkansas) found that hybrid varieties exhibited mean paddy yield premiums of 1.6 to 2.4 Mg ha -1 relative to the best-performing conventional cultivar ('Francis') and were found to be associated with no increase in yield variability (Lyman and Nalley, 2013). A broad study by Nalley et al (2016) that covered Arkansas and Mississippi observed that hybrid and Clearfield (CL) hybrid varieties had a paddy yield premium over conventional varieties of 1.66 and 1.82 Mg ha -1 , respectively. The authors found that, on average, hybrid varieties outperform conventional rice varieties in terms of absolute profit per hectare and relative profit margin, defined as profit per cost of production, for both CL and non-CL varieties.…”

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confidence: 98%

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The Production, Consumption, and Environmental Impacts of Rice Hybridization in the United States

et al. 2017

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Th e introduction of hybrid rice in the United States gives producers an alternative to traditionally cultivated, conventional lines. Th e objective of our study is to estimate the economic (consumer and producer welfare) and environmental impacts of the commercial adoption of hybrid rice in the Mid-South of the United States. In our study, the revenue gains associated with hybrid adoption were estimated at an average of $76.24 million annually from 2003 to 2013, using existing research fi ndings in combination with original modeling. Disease packages, specifi cally the blast resistance found in all publically released hybrids, led to both cost and fungicide reductions, which in turn result in higher profi ts and increased levels of environmental sustainability. Th e cost savings from eliminating fungicide applications and mitigating yield loss through embedded blast resistance in hybrids were estimated at $14.35 million annually from 2003 to 2013. Th e RiceFlow model results from our study suggest that the yield premiums through heterosis and blast resistance associated with hybrid adoption in the MidSouth increased US exports by 383,000 Mg annually and has fed an additional 5.89 million people annually. Furthermore, the results from our detailed Life Cycle Assessment show that hybrid rice has lower environmental (fossil fuel depletion, ecotoxicity, carcinogenics, eutrophication, acidifi cation, global warming, and ozone depletion) impacts per megagram of rice than conventional rice.

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Section: Value Of Genetic Gainmentioning

confidence: 93%

Section: Value Of Genetic Gainmentioning

confidence: 93%

Section: Value Of Genetic Gainmentioning

confidence: 99%

Section: Value Of Genetic Gainmentioning

confidence: 99%

mentioning

confidence: 98%

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The Production, Consumption, and Environmental Impacts of Rice Hybridization in the United States

et al. 2017

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Determination of critical Y‐leaf potassium concentrations in pure‐line and hybrid rice

Gruener

Drescher

Slaton

et al. 2022

Agrosystems Geosci & Env

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Potassium (K) deficiency symptoms of rice (Oryza sativa L.) are difficult to visually diagnose during reproductive growth. Critical tissue–K concentrations may change across time and within cultivars. Our goal was to evaluate rice yield response to K fertilization and define continuous critical Y‐leaf–K concentrations (YLKC) for the production of ≥95% relative yield in pure‐line and hybrid rice. Ten Y‐leaves (uppermost leaf with a fully developed collar) were collected weekly during rice reproductive growth from selected fertilizer‐K rates (0–150 kg K ha–1) in 13 trials with variable soil‐test K (32–164 mg kg–1). Trials were seeded either with a pure‐line (8) or hybrid (5) cultivar. Significant yield increases from K fertilization occurred in 38% of the trials. Pure‐line cultivars were responsive to K fertilization and rice without fertilizer‐K produced 66–90% of maximum yield produced by fertilized treatments (8,506–11,153 kg ha–1). Hybrid rice receiving no fertilizer‐K produced 96–99% of maximum yield (9,067–12,572 kg ha–1) regardless of soil‐test K. The YLKC increased with increasing fertilizer‐K rate and declined across time for K‐sufficient rice or remained relatively constant across time for rice marginally sufficient or deficient in K. Rice YLKC above 16.0 g K kg–1 between R1 and R2 maximizes pure‐line cultivars yield production. The critical YLKC declined to about 13.0 g K kg–1 between R2 and R3 but was less accurate for diagnosing K deficiency than samples collected before R2. The YLKC can be used to assess pure‐line cultivars’ K nutritional status between the R1 and R2 stages.

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Use of objective imaging systems to assess subjective grain appearance traits important to the US rice industry

McClung

Chen

Jodari³

et al. 2020

Cereal Chem

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Background and objectives Milled rice grain appearance traits, including chalk, determine its grade, price, and marketability. These appearance traits are evaluated visually (VI) in the United States by officially trained inspectors and at commercial mills. Digital imaging systems (IS) provide an alternative means to objectively and rapidly measure these traits. The goals of this study were to compare chalk values determined by VI and IS and to identify IS parameters that are associated with the five grain appearance traits commonly assessed by the US rice industry. Findings Milled rice chalk determined by three VI methods used by commercial mills, a rice export company, and government inspectors, and three IS, WinSeedle, SeedCount, and S21, differed significantly. However, all six methods agreed on ranking of the best and worst of 20 US cultivars for chalkiness. Multiple linear regression analyses identified quality parameters from each IS that are associated with—bran streaks, chalk, kernel color, uniformity length, and appearance overall as determined by commercial mills. Conclusions IS can rapidly quantify rice grain appearance traits but agree with subjective ratings for chalkiness only when differences are extreme. Subjective grain appearance traits as determined by commercial mills appear to be based on several parameters detected by IS. Significance and novelty IS demonstrated that discolored kernels and grain chalkiness are the major factors explaining differences in overall appearance of US long‐grain varieties as subjectively assessed by commercial mills.

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Quantifying the Agronomic and Economic Performance of Hybrid and Conventional Rice Varieties

Cited by 31 publications

References 30 publications

The Production, Consumption, and Environmental Impacts of Rice Hybridization in the United States

The Production, Consumption, and Environmental Impacts of Rice Hybridization in the United States

Determination of critical Y‐leaf potassium concentrations in pure‐line and hybrid rice

Use of objective imaging systems to assess subjective grain appearance traits important to the US rice industry

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