Produtividade de genótipos de milho em resposta à época de semeadura

Nascimento, Flávia Meinicke; Bicudo, Sílvio José; Rodrigues, José Guilherme Lanças; Furtado, Mariléia Barros; Campos, Sérgio

doi:10.1590/s0034-737x2011000200010

Cited by 7 publications

(14 citation statements)

References 6 publications

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“…Além dos fatores ambientais, é importante a escolha das cultivares; a falta de informações sobre a adaptação de cultivares ao ambiente leva à menor produtividade, portanto, a avaliação regional de cultivares de milho cultivados em diferentes épocas contribui efetivamente para o aumento da produtividade (NASCIMENTO et al, 2011). Assim, objetivou-se com este trabalho avaliar o desempenho agronômico de oito genótipos, quatro variedades de polinização aberta e quatro híbridos de milho, cultivados em duas épocas de semeadura, safra e safrinha, em dois anos agrícolas na região de Manaus, Amazonas.…”

Section: Methodsunclassified

“…In addition to environmental factors, the choice of cultivars is of great significance; the lack of information on the adaptation of cultivars to the environment leads to lower productivity. Therefore, the regional assessment of corn cultivars grown at different periods effectively contributes to increasing productivity (NASCIMENTO et al, 2011). Thus, this study aimed to evaluate the agronomic performance of eight genotypes, four open-pollinated varieties, and four corn hybrids, cultivated in two sowing seasons, harvest season and off-season, in two agricultural years in the region of Manaus, Amazonas.…”

Section: Introductionmentioning

confidence: 99%

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Agronomic performance of eight corn genotypes in two sowing periods

Oliveira

Fontes

Morais

2020

AGRO@MBIENTE ON-LINE

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Climatic factors of a region determine the critical periods of corn crop development and affect the sowing planning in order to reduce the negative effects on yield. This study aimed to evaluate the agronomic performance of eight corn genotypes and two sowing dates in the edaphoclimatic conditions of Manaus, Amazonas. Four experiments were carried out in the agricultural years 2016/2017 and 2017/2018, conducted in two sowing periods under harvest season and off-season conditions each year. The sown of the harvest season and off-season were made in October and March, respectively. The experiments were conducted in a randomized block design, with eight genotypes (four varieties - BR 106, BR 5011 Sertanejo, BRS 4103, and BRS Caimbé; and four hybrids - AG 1051, BRS 1055, BRS 3040, and BRS 3046), and four replicates evaluated in two sowing periods for each year. The data were submitted to individual variance analysis for each sowing period, joint for each year, and to the means comparison test. Corn cultivation at the Manaus region could be carried out both during the harvest season, sowing at the beginning of the rainy period (October), and in the off-season, with sowing near the end of the rainy period (March). Hybrids have higher yield potential than open-pollinated varieties for both grain and green ear cultivation, regardless of sowing, harvest, or off-season.

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Section: Methodsunclassified

Section: Introductionmentioning

confidence: 99%

Agronomic performance of eight corn genotypes in two sowing periods

Oliveira

Fontes

Morais

2020

AGRO@MBIENTE ON-LINE

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“…Nascimento et al, [54], hybrids of safrinha have been developed allowing early sowing, more efficiency for water consumption, light, temperature, and nutrient absorption.…”

Section: Feed Crop Water Productivity Scenarios and Potential Water Smentioning

confidence: 99%

The Effect of Best Crop Practices in the Pig and Poultry Production on Water Productivity in a Southern Brazilian Watershed

Carra

Palhares

Drastig

et al. 2020

Water

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This study analyzes the relation between Brazilian broiler and pig production and water productivity using recently developed reference guidelines on water footprinting for livestock production systems and supply chains. Different rainfed crop arrangements, in different scenarios and producer regions in Brazil, were assessed. Water productivity of broiler feed consumption ranged from 0.63 to 1.38 kg per m3 water input to rainfed summer maize (safra) and from 1.20 to 2.21 kg per m3 water input to winter maize (safrinha) while it ranged from 0.28 to 0.95 kg per m3 water input to rainfed soy. For pig feed consumption, rainfed maize ranged from 0.68 to 1.49 kg per m3 water input (safra) and from 1.30 to 2.38 kg per m3 water input (safrinha) while it ranged from 0.30 to 1.03 kg per m3 water input to rainfed soy. A potential amount of water saving of 0.0336 km3 year−1 and 0.0202 km3 year−1 could be attained for producing broiler and pig feed, respectively, depending on the crop rotation and producer region. The results showed that the evapotranspiration of animal feed production represents more than 99% of the total water consumption for broiler and pig production in the study area. The implementation of best crop practices resulted in higher water productivity values of chicken and pork meat and also improved the rainfall water-saving in comparison to conventional agriculture. Hence, the water productivity of the animal production chain in tropical regions demands a close relation to agriculture in order to attain a better understanding and improvement of rainfall water productivity for animal feed production.

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“…Yield increases, in part, by the improvement of cultivation techniques (Besen et al, 2019) and by the use of promising genotypes, such as more adapted maize hybrids (Nardino et al, 2016). The marketing and choosing of seeds are increasingly selective in relation to maize hybrids due to requirements from farmers, and grain yield is one of the main variables taken into account when choosing the material to be cultivated (Nascimento et al, 2011;Serpa et al, 2012;Silva et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Principal component analysis for selection of superior maize genotypes

Carnimeo¹,

Bertasello²,

Dutra³

et al. 2020

Científica

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Constant advances in studies on the behavior of maize genotypes and their interactions with the environment are of great importance for the best performance of the plant. This study verifies effects and causes of agronomic variables of maize hybrids on grain yields and performs the indirect selection of superior genotypes by principal component analysis (PCA). Two hundred and thirty maize genotypes were used, with two hundred and twenty--nine topcross hybrids (consisting of crossings of two hundred and twenty-nine partially inbred genotypes with a tester) and one check in a randomized block design with two repetitions. The genotypes were evaluated during the 2016 and 2016/2017 crops considering the agronomic variables plant height, ear insertion height, ear position, lodging, breakage, and grain yield. Data were submitted to analysis of variance and means were compared by the Scott-Knott test (p<0.05) with subsequent multivariate exploratory analysis by PCA. In the principal component analysis, components explained 52.07% and 55.69% of the variance contained in the original variables for the 2016 and 2016/2017 crops, respectively. The variable that was most significant in both crops was ear insertion height, allowing the indirect selection of more productive genotypes. Indirect selection of the most productive genotypes was also conducted through variables that contributed significantly in the principal component analysis. Thus, the use of multivariate exploratory analysis is efficient in the characterization and selection of maize genotypes evaluated in different crop seasons.

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Produtividade de genótipos de milho em resposta à época de semeadura

Cited by 7 publications

References 6 publications

Agronomic performance of eight corn genotypes in two sowing periods

Agronomic performance of eight corn genotypes in two sowing periods

The Effect of Best Crop Practices in the Pig and Poultry Production on Water Productivity in a Southern Brazilian Watershed

Principal component analysis for selection of superior maize genotypes

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