Yield component analysis of grain sorghum grown under water stress

Tolk, Judy A.; Howell, Terry A.; Miller, Fred R.

doi:10.1016/j.fcr.2013.02.006

Cited by 29 publications

(24 citation statements)

References 32 publications

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“…Cada redução de 25% na ET c , observou-se decréscimo de 0,05 m no comprimento médio das panículas e 0,006 kg na massa de grãos por panícula. A redução na massa de grãos por panícula é o resultado direto da redução no comprimento da panícula, pois a redução no comprimento reduz o volume de grãos por panícula, acarretando menor massa de grãos (TOLK et al, 2013). GODBHARLE et al (2010) afirmam haver uma correlação positiva entre o comprimento da panícula e a produção de grãos, e ainda apontam que essa pode ser uma importante característica para melhorar a produção de grãos por planta.…”

Section: Figura 1 íNdice De áRea Foliar (A) E Altura De Plantas De Sunclassified

Desempenho produtivo e retorno econômico da cultura do sorgo submetida à irrigação deficitária

et al. 2015

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RESUMO:A irrigação deficitária é comumente utilizada em regiões de reduzida disponibilidade de água ou de energia para a irrigação e visa incrementar a eficiência de uso da água. Essa técnica pode ser adequada à cultura do sorgo, que apresenta produtividades satisfatórias, mesmo em condições limitadas de disponibilidade de água no solo. Os objetivos do trabalho foram: avaliar os efeitos de diferentes manejos de irrigação deficitária sobre o índice de área foliar, altura de plantas e rendimento de grãos do sorgo, e identificar o nível crítico de irrigação deficitária que proporciona maior produtividade da água irrigada e retorno econômico. O experimento foi desenvolvido no ano agrícola de 2012/2013, sob uma cobertura móvel, que impedia a ocorrência de chuva na área experimental. Foram testados quatro manejos de irrigação deficitária: 100; 75; 50 e 25% de reposição da evapotranspiração da cultura (ET c ). A redução de 25% na reposição da ET c resultou na diminuição de 7% na altura das plantas, 5% no índice de área foliar e 17% no rendimento de grãos. A maior receita líquida da cultura foi alcançada utilizando o manejo de irrigação com reposição de 75% da ET c . A produtividade da água e o retorno econômico da aplicação de água apresentaram uma resposta linear positiva em relação à redução na reposição da ET c . PALAVRAS-CHAVE: evapotranspiração da cultura, produtividade da água irrigada, Sorghum bicolor. PRODUCTIVE PERFORMANCE AND ECONOMIC RETURN OF SORGHUM CROP SUBMITTED TO DEFICIT IRRIGATION ABSTRACT:The deficit irrigation is commonly used in regions of reduced water and energy availability for irrigation with a view to increase water use efficiency. This technology can be a strategy to increase sorghum production under the conditions of limited soil water availability. The objectives of this study were to: (i) evaluate the effects of different deficit irrigation management on leaf area index, plant height and grain yield of sorghum, and (ii) identify the critical level of deficit irrigation for optimum irrigated water productivity and economic return. The experiment was conducted in a Rainout Shelter during the 2012/13 cropping season. The deficit irrigation management consisted of water replacement in the crop root zone by: 100, 75, 50 and 25% of crop evapotranspiration (ET c ). A 25% reduction in the replacement of ET c resulted in about 7% decrease in plant height, 5% in leaf area index and 17% in sorghum grain yield . The highest net revenue of the culture was achieved using ET c replacement of 75%. The water productivity and economic return of water application showed a positive linear response in relation to the reduction in ET c replacement .

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Section: Figura 1 íNdice De áRea Foliar (A) E Altura De Plantas De Sunclassified

Desempenho produtivo e retorno econômico da cultura do sorgo submetida à irrigação deficitária

et al. 2015

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“…Plants under stress at GS2 exhibit a pre-flowering response that directly affects panicle size, grain number, and grain yield. Under GS3 stress, premature plant death, increased susceptibility to charcoal rot, stalk collapse and lodging, and a significant reduction in seed size may occur; each of these can result in decreased yield (Rosenow et al, 1996;Magalhães et al, 2003;Tolk et al, 2013;Borrell et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Evaluation of grain yield in sorghum hybrids under water stress

et al. 2015

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ABSTRACT. Sorghum grain yield can be significantly affected by climatic changes, especially drought and high temperature. The purpose of this study was to evaluate hybrids of grain sorghum grown under normal irrigation conditions or water stress in order to select those likely to be more tolerant of drought. Forty-nine hybrids were grown in a randomized block design experiment, with three replications. The plots consisted of four rows of 5 m length. Grain yield, weight of 1000 grains, harvest index, days to flowering, and plant height were measured. All of these characteristics were affected by water stress; however, grain yield showed the largest relative reduction. Comparison of the various genotypes showed that some hybrids had an acceptable grain yield under water stress, and maintained a high average yield compared to growth without stress. Several hybrids gave better grain yield than commercial check

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“…These factors have allowed the expansion of sorghum crops through Brazil, mainly in the off season, in regions with low rainfall and weather conditions that are less favorable to corn cultivation (Parrella et al, 2014;Tolk;Howell;Miller, 2013;Vasconcelos et al, 2001). Even so, in many areas, sorghum production is low due to inadequate handling practices and marginal growth conditions, which are primarily caused by low spending on mineral nutrition; many producers believe that grain sorghum is more "rustic" and does not need the phytosanitary treatments that are applied to other crops, which is not the case Many experiments that have evaluated the productivity of the different grain sorghums have shown the high potential that this crop has for grain production under adverse growing conditions, even in central Brazilian regions (Almeida Filho et al, 2014;Almeida Filho et al, 2010;Silva et al, 2009) or in semiarid regions (Albuquerque et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Agronomic characteristics and macronutrient export of grain sorghum hybrids from different sowing dates

et al. 2017

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Brazilian off-season cropping is increasing the production of cereals, particularly in the Brazilian savannah. Sorghum has been widely used for its grain production capacity and dry matter. Several hybrids are commercially available, each with its own peculiar nutrient absorption capacity. Thus, this study analyzed the agronomic characteristics and nutrient exportation in grain sorghum hybrids sown on different dates. The experiment was conducted at the Paulista Agency Regional Center of Agricultural Technology (APTA) in the city of Votuporanga, São Paulo. The experiment was conducted in a randomized block design with four replications and 4 hybrids. Sorghum hybrids (50A10, 50A50, BUSTER and 1G282) were the different treatments sown on four different dates, beginning with February 26, 2013, with the other dates 17, 30 and 41 days after the first sowing (DAFS). Each sowing date was considered an individual experiment and, subsequently, grouped for analysis to compare characteristics. Macronutrient content in the grain, one thousand grain weight, productivity and exportation of macronutrients (kg ha -1 ) by grains in the area were evaluated. The productivity of the sorghum hybrids varied depending on the sowing dates. The one thousand grain mass of the sorghum hybrids varied depending on the sowing dates. The average exportation of macronutrients by sorghum grains is as follows, in decreasing order: N> K> P>Ca> Mg> S. The mean values of macronutrient accumulation needed to produce one ton of sorghum grains are as follows: 20.05 kg N, 3.33 kg P, 3.70 kg K, 3.49 kg Ca, 1.77 kg Mg, and 0.72 kg S.

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Yield component analysis of grain sorghum grown under water stress

Cited by 29 publications

References 32 publications

Desempenho produtivo e retorno econômico da cultura do sorgo submetida à irrigação deficitária

Desempenho produtivo e retorno econômico da cultura do sorgo submetida à irrigação deficitária

Evaluation of grain yield in sorghum hybrids under water stress

Agronomic characteristics and macronutrient export of grain sorghum hybrids from different sowing dates

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