Desempenho de cultivares e linhagens de arroz de terras altas sob plantio direto e convencional

Reis, Miria Hespanhol Miranda; Soares, Antônio Alves; Cornélio, Vanda Maria de Oliveira; Soares, Plínio César

doi:10.1590/s1413-70542008000500012

Cited by 6 publications

(6 citation statements)

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“…Considering the existence of genetic variability in a population as a decisive factor in any breeding program (Cruz et al, 2004;Lynch and Walsh, 1998;Falconer and MacKay, 1996;Falconer et al, 1987;Falconer and MacKay et al, 1996), the studied population proved to be promising for selection and crossing works which aim at improving these traits. Similar results were obtained in other studies with rice crop (CARGNELUTTI FILHO et al, 2012;NASCENTE et al, 2011;REIS et al, 2007). In general, the estimated values of the coefficients of experimental variation denote moderate to high experimental precision (CARGNELUTTI FILHO et al, 2012), except for NP and NS, which obtained values above 20%.…”

Section: Resultssupporting

confidence: 89%

Genetic parameters, correlations and path analysis in upland rice genotypes

Abreu¹,

Teodoro²,

Pantaleão³

et al. 2016

Biosci. J.

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ABSTRACT:Trying to obtain information relevant to the genetic improvement of rice, the aim of research was to estimate genetic parameters and identify agronomic characters directly and indirectly correlated with the grain yield of ten cultivars of upland rice. The experiment was conducted in the municipality of Aquidauna-MS, region of transition among the Savanna and Pantanal biomes. The experimental design was a randomized block with three replications. Treatments consisted of ten genotypes (BRS Aimoré, BRS Coringa, BRS Pepita, BRS Bonança, BRS Talento, BRS Maravilha, BRS Primavera, BRS Caiapó, BRS Monarca and BRS Aroma). The following variables were measured: days to flowering and maturity, plant height, number of stems and panicles, thousand grains mass and grain yield. It was determined the following genetic parameters: environmental, phenotypic and genotypic variances; coefficients of experimental and genotypic variation; heritability; b quotient; environmental, phenotypic and genetic correlations. Phenotypic correlations among traits and grain yield (principal dependent variable) were unfolded in direct and indirect effects. The population under study proved to be promising for improvement based on the traits plant height, days to flowering, thousand grains mass and grain yield. Plant height, number of panicles and thousand grains mass directly influence the yield, being recommended for direct selection of superior genotypes.

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Section: Resultssupporting

confidence: 89%

Genetic parameters, correlations and path analysis in upland rice genotypes

Abreu¹,

Teodoro²,

Pantaleão³

et al. 2016

Biosci. J.

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“…However, rice after soybean/millet and after soybean/ fallow in NTS was observed to have had the highest grain yields and they were similar to the fallow treatment in conventional tillage system (Table 3). Moura Neto et al (2002), Reis et al (2008) and Nascente et al (2011) also found similar results with no difference between conventional tillage and no-tillage systems. Moreover, it was very clear that using soybean as a previous summer crop was much better than using previous upland rice at no-tillage and conventional tillage systems (Table 3).…”

Section: Resultsmentioning

confidence: 60%

Upland rice yield as affected by previous summer crop rotation (soybean or upland rice) and glyphosate management on cover crops

Nascente

Crusciol²,

Stone³

et al. 2013

Planta daninha

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The appropriate chemical management of cover crops in no-tillage aims to obtain greater benefits with its employment in agricultural systems. The objective of this study was to assess upland rice yield as affected by the previous summer crop, species and desiccation timing of cover crops by glyphosate. Sown cover crops were sown (November 2007), followed by rice in half of the experimental area and soybean in the other half (November 2008). After the harvesting of these crops, the same cover crops were sown again (March 2009) and followed by upland rice in the total area (November 2009). The experiment consisted of the combination of five cover crops (fallow, Panicum maximum, Brachiaria ruziziensis, B. brizantha and Pennisetum glaucum), four desiccation timings (30, 20, 10 and 0 days before rice sowing), and two antecedents of the summer crop (rice or soybean) under no-tillage system (NTS), plus two control treatments at conventional tillage system (CTS). Cover crops significantly affect rice grain yield and its components. There is a significant tendency to highest yield when cover crop desiccation is conducted farther from the rice sowing date (from 2,577.1 kg ha-1 - desiccation at rice sowing to 3,115.30 kg ha-1 - desiccation 30 days before rice sowing). Soybean as an antecedent of summer crop allows better upland rice yield (3,754 kg ha-1) than rice as an antecedent of summer crop (2,635 kg ha-1); fallow/soybean/fallow (4,507 kg ha-1) and millet/soybean/millet (4,765 kg ha-1) rotation at no-tillage system, and incorporated fallow /soybean/ incorporated fallow (4,427 kg ha-1) at conventional tillage system allow the highest rice yield; upland rice yield is similar at no-till (3,194 kg ha-1) and till system (2,878 kg ha-1).

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“…Upland rice genotypes produce different grain yield, according to soil tillage (Moura Neto et al 2002, Guimarães et al 2006, Reis et al 2008, Nascente et al 2011). Nascente et al (2011) ), but noticed that other genotypes yielded more under CTS.…”

Section: Key-wordsmentioning

confidence: 99%

Seed treatment, soil compaction and nitrogen management affect upland rice

Pinheiro

Nascente

Stone

et al. 2016

Pesqui. Agropecu. Trop.

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Water availability for cultivation of irrigated rice (Oryza sativa L.) is decreasing worldwide. Therefore, new technologies are needed to grow rice under aerobic conditions, in order to produce rice grains without yield losses and with lower water consumption. This study aimed at determining the best combination of management options for producing upland rice. A randomized blocks design, in a factorial scheme, was used. The treatments consisted of a combination of five rice cultivars (BRS Caçula, BRS Serra Dourada, BRS Primavera, BRS Sertaneja and BRS Esmeralda) with two compaction pressures in the seed furrow (25 kPa or 126 kPa), two types of seed treatment (with or without pesticide) and two types of N management (all at sowing or all at topdressing). Applying N at sowing instead of at topdressing produced higher grain yield in the no-tillage system (NTS). Under this system, upland rice genotypes show higher grain yield with higher compaction pressure. Seed treatment with pesticide provided greater grain yield for the BRS Sertaneja, in NTS, and for all genotypes in the conventional tillage system (CTS). BRS Esmeralda, in NTS, and BRS Esmeralda and BRS Primavera, in CTS, were the most productive genotypes. Moreover, in NTS, the application of N at sowing and the compaction pressure on the seed furrow are important for increasing upland rice grain yield. In CTS, seed treatment is important to improve upland rice grain yield.

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Desempenho de cultivares e linhagens de arroz de terras altas sob plantio direto e convencional

Cited by 6 publications

References 0 publications

Genetic parameters, correlations and path analysis in upland rice genotypes

Genetic parameters, correlations and path analysis in upland rice genotypes

Upland rice yield as affected by previous summer crop rotation (soybean or upland rice) and glyphosate management on cover crops

Seed treatment, soil compaction and nitrogen management affect upland rice

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