Redução na população de plantas sobre a produtividade e a qualidade fisiológica da semente de soja

Vazquez, Gisele Herbst; Carvalho, N. M.; Borba, Maria Madalena Zocoller

doi:10.1590/s0101-31222008000200001

Cited by 30 publications

(32 citation statements)

References 4 publications

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“…O uso de populações muito acima da recomendada, além de acarretar aumento nos gastos com sementes, pode levar ao acamamento de plantas e não proporcionar acréscimo na produtividade. Já a adoção de populações abaixo da recomendada favorece o desenvolvimento de plantas daninhas e pode resultar em elevadas perdas no momento da colheita (Vasquez et al, 2008).…”

Section: Introductionunclassified

Relação entre densidade de plantas e genótipos de soja roundup readyTM

et al. 2010

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RESUMO -A presente pesquisa teve por objetivo estudar a influência de diferentes densidades de plantas e genótipos de soja Roundup Ready™ (RR) em algumas características morfoagronômicas da soja, semeada em duas safras distintas. O experimento foi conduzido na região dos Campos de Cima da Serra, no Estado do Rio Grande do Sul, nas safras agrícolas 2006/07 e 2007/08, com os cultivares CD 213RR e BRS 255RR, nas densidades de 12, 18, 24, 30 e 36 plantas aptas por m 2 . O delineamento experimental utilizado foi de blocos ao acaso, com quatro repetições. Para isso, foram avaliados altura de plantas, diâmetro da haste, número de ramificações por planta, número de vagens por planta, número de grãos por planta, número de grãos por vagem, massa de mil grãos e rendimento de grãos por hectare. O manejo das plantas daninhas com glyphosate em duas etapas (pré-semeadura e em V4) evitou eficientemente a matocompetição. O aumento da densidade de plantas de soja RR promoveu incremento linear da altura das plantas (0,5 a 0,9 cm por planta m -2 ), influenciada pelo genótipo e pelo ano de cultivo. O diâmetro da haste foi diminuído com o aumento da densidade de plantas de soja RR de forma linear (-0,03 a -0,2 mm por planta m -2 ). O número de ramos por planta reduziu com o aumento da densidade (-0,05 a -0,19 ramos por planta). Na segunda safra, o rendimento de grãos e a massa de mil grãos foram menores, afetados por um período de estiagem e também por uma geada no final do ciclo, mais acentuadamente para o CD 213RR. A combinação de maior número de plantas m -2 levou a uma redução do número de vagens por planta e de grãos por vagem, embora de magnitudes distintas entre as cultivares, o que foi discutido pela interação entre os fatores; no entanto, o rendimento de grãos não foi alterado nas diferentes densidades testadas, e sim sofreu influência da safra de cultivo.Palavras-chave: características agronômicas, Glycine max, população de plantas, produtividade.ABSTRACT -This work studied the influence of different plant densities and Roundup Ready™ (RR) soybean genotypes, on some morphoagronomic characteristics of soybean sown in two distinct crops. The experiment was carried out in Campos de Cima da Serra in the state of Rio Grande do Sul, Brazil, in the 2006/07 and 2007/08 growing seasons with CD 213RR and BRS 255RR cultivars, at densities of 12, 18, 24, 30 and 36 suitable plants m -2 . The experimental layout used was randomized blocks with four repetitions. Plant height, stem diameter, number of ramifications per plant, number of pods per plant, number of grains per plant, number of grains per pod, mass of a thousand grains and yield of grains per hectare were evaluated. Weed plant management with glyphosate in two applications (pre-sowing and V4) efficiently prevented weed competition. Increasing RR soybean plant density led to a linear increase in plant height (0.5 to 0.9 cm per plant m -2 ), influenced by genotype and crop year. Stem diameter reduced linearly with an increase in plant density (-0.03 to -0.2 mm per plant m -2 ). Th...

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Section: Introductionunclassified

Relação entre densidade de plantas e genótipos de soja roundup readyTM

et al. 2010

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“…Several studies have been indicating contradictory results of mass of one thousand seeds in relation to plant population. Crusciol et al (2002) and Vazquez et al (2008) did not find variations in the mass of seeds in function of the evaluated plant populations. On the other hand, Tourino et al (2002), evaluating the effect of sowing density and uniformity on productivity and agronomical characteristics of soybeans, found decreases in the mass of seeds.…”

Section: Resultsmentioning

confidence: 72%

“…In their work, Vazquez et al (2008) concluded that variations in plant populations did not cause changes in the germination percentage and accelerated aging in soybeans seeds. On the other hand, Lazarini et al (2001) reported that the sowing density affected seed vigor when evaluated by the accelerated aging and the germination speed index.…”

Section: Resultsmentioning

confidence: 99%

Physiological potential of bean seeds as a function of population densities on winter crop season, in northern Minas Gerais

et al. 2015

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ABSTRACT:For adapting well to various soil and climatic conditions in Brazil and the tradition of high consumption, bean plays a key role in feeding the population. Despite the different environmental conditions, there are few specific cultivars for each planting season, particularly when aimed at the production of quality seeds. The objective of this study was to evaluate the physiological potential of bean seeds from five population densities, under the edafoclimatic conditions of Janaúba, northern Minas Gerais. The experiment was conducted on winter crop season, with planting in August 2011. The experimental design was a randomized block in 3 x 5 factorial, with four replicates. The treatments consisted of three cultivars of common bean with different growth types (Ouro Vermelho, Ouro Negro and BRSMG Madrepérola), and five densities (100, 200, 300, 400 and 500 thousand plants ha -1 ). Seeds were evaluated for water content, germination and vigor (tests of first count, seedling emergence, emergence speed and accelerated aging). From the results, it can be concluded that the bean seeds of the cultivar Ouro Negro present superior physiological potential in relation to the cultivars Ouro Vermelho and BRSMG Madrepérola. Increasing the sowing density up to 300 thousand plants ha -1 is suitable for the production of bean seeds on winter crop season, representing a good alternative for cultivation in the region.

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“…It was the third year of use of the area with agroecological managements, in the beginning of the conversion process from a conventional area to an agroecological, its observed a productivity decrease, which increased with the establishment of the system [36] [37].…”

Section: Resultsmentioning

confidence: 99%

Agronomic and Productivity Performance for Quinoa Genotypes in an Agroecological and Conventional Production System

Belmonte¹,

Vasconcelos²,

Tsutsumi³

et al. 2018

AJPS

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The objective of this research was to evaluate the agronomic performance and productivity of sixteen genotypes of Chenopodium quinoa cultivated in agroecological and conventional production systems. The evaluations were carried out, based on agronomic characteristics and yields of sixteen C. quinoa genotypes, grown in two simultaneous experiments, in an agroecological production and a conventional production system carried out at the town of Entre Rios do Oeste, Paraná, Brazil in the harvest 2015/16. Each experiment was composed of three replicates, following the randomized block design. Number of plants in flowering, number of plants per linear meter, height of insertion of the first panicle, number of days for maturation and productivity were the parameters evaluated. The data were submitted to statistical analysis with the aid of the GENES computational application. Genotype Q13-24 showed a more suitable production for the conventional production system. While the genotype Q13-01, presented the increase of productivity, being more indicated to the system of agroecological production. The characteristics height of plant flowers (HPF) and height of insertion of the first panicle (HIP) had higher values when the plants were cultivated in a conventional system. The number of plants per linear meter (NPLM) was higher in the agroecological crop, when compared to conventional cultivation. The same quinoa genotype can behave differently depending on the area management, being a productivity and the genotype cycle depends on the production system and the genotype used.

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Redução na população de plantas sobre a produtividade e a qualidade fisiológica da semente de soja

Cited by 30 publications

References 4 publications

Relação entre densidade de plantas e genótipos de soja roundup readyTM

Relação entre densidade de plantas e genótipos de soja roundup readyTM

Physiological potential of bean seeds as a function of population densities on winter crop season, in northern Minas Gerais

Agronomic and Productivity Performance for Quinoa Genotypes in an Agroecological and Conventional Production System

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