Relação entre densidade de plantas e genótipos de soja roundup readyTM

Souza, Clóvis Arruda; Gava, Fernando Henrique; Casa, Ricardo Trezzi; Bolzan, Jonathan Marcel; Kuhnem, Paulo Roberto

doi:10.1590/s0100-83582010000400022

Cited by 35 publications

(29 citation statements)

References 13 publications

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“…These results showed that the plant densities at harvest were well below the desired densities at sowing. These findings were in agreement with the results of Cox and Cherney (2011) and Suhre et al (2014). These authors reported that many biotic and abiotic factors, such as machinery malfunction, seed diseases, soil compaction and hail rain, interfere in the establishment of a stand.…”

Section: Resultssupporting

confidence: 91%

“…We observed a linear reduction in the percentage of green seeds with an increase in the seeding rate. In contrast to what was hypothesized, an increase in the intraspecific competition caused by a higher plant density (SOUZA et al, 2010), especially when associated with water and thermal stress, did not provoke forced maturation of the seeds, causing the retention of chlorophyll in the cotyledons. This result reinforces the aforementioned theory that supported the production of larger seeds at high plant densities, since the best water supply at high densities prevented the forced degradation of chlorophyll, and thus, the In the 2013/14 crop, the occurrence of green seeds was affected by the seeding rate ( Figure 5) and seed size (Table 1).…”

Section: Evaluation Of the Mass Of One Thousand Seeds And The Percentcontrasting

confidence: 82%

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Size, physiological quality, and green seed occurrence influenced by seeding rate in soybeans

Ferreira

Zucareli

Balbinot

et al. 2017

SCA

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The seeding rate influences the intraspecific competition, which might affect the development and quality of seeds in soybean. However, the impact of seeding rate on the physical and physiological qualities of soybean seeds needs to be better elucidated. This study aimed to evaluate the effects of soybean plant density on the seed size as well as the effects of the interaction between the plant density and seed size on the seed mass, green seed occurence, and physiological seed quality. The experiments were carried out in the growing seasons of the years 2013/14 and 2014/15 in a Latossolo Vermelho distroférrico, under a randomized complete block design, using the NK 7059 RR cultivar with six replications. Four plant densities (150, 300, 440, and 560 thousand viable seeds ha -1 ) were evaluated. After the classification of seeds into four sizes, using a set of sieves, a 4 ×4 factorial scheme was used for the statistical analysis of the four plant densities and four seed sizes. The seed samples were evaluated for the seed mass, green seed percentage, germination, and vigor. Under thermal and water stress during seed development, an increase in the seeding rate led to a reduction in the green seed occurrence and an increase in the seed size and mass. However, in the absence of thermal and water stress, the seed size and mass were not altered by the seeding rate and, there was no occurrence of green seeds. Key words: Plant density. Chlorophyll retention. Green seeds. Seed vigor. ResumoA densidade de semeadura, por influenciar na competição intraespecífica, pode afetar o desenvolvimento e a qualidade das sementes de soja produzidas. Entretanto, o impacto da densidade de semeadura sobre a qualidade física e fisiológica das sementes de soja precisa ser melhor elucidado. Objetivou-se avaliar os efeitos da densidade de semeadura sobre o tamanho das sementes produzidas e a interação entre a densidade de semeadura e o tamanho das sementes sobre a massa, a ocorrência de sementes verdes e a qualidade fisiológica das mesmas. O experimento foi conduzido nas safras 2013/14 e 2014/15, em um Latossolo Vermelho distroférrico, sob o delineamento de blocos casualizados, utilizando-se a cultivar NK7059 RR, com seis repetições. Os tratamentos consistiram de quatro densidades de semeadura (150, 300, 440 e 560 mil sementes viáveis ha -1 ). Após a classificação em peneiras das sementes produzidas, adotou-se o esquema fatorial 4 x 4, com 4 densidades e 4 tamanhos de sementes. Avaliaram-se a massa de mil sementes, porcentagem de sementes verdes, germinação e vigor. O aumento na densidade de

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Section: Resultssupporting

confidence: 91%

Section: Evaluation Of the Mass Of One Thousand Seeds And The Percentcontrasting

confidence: 82%

Size, physiological quality, and green seed occurrence influenced by seeding rate in soybeans

Ferreira

Zucareli

Balbinot

et al. 2017

SCA

View full text Add to dashboard Cite

show abstract

“…Plant spatial arrangement is determined by plant density and row spacing, and a change in these elements may increase grain yield, without a major impact in production cost (Souza et al 2010). Plant density affects intraspecific competition for water, light and nutrients and may alter plant architecture, the use of environmental resources and phytosanitary management (Procópio et al 2013).…”

Section: Introductionmentioning

confidence: 99%

Plant density and mineral nitrogen fertilization influencing yield, yield components and concentration of oil and protein in soybean grains

et al. 2016

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“…However, there are few studies considering cultivars with indeterminate growth habit, development cycle shorter than 120 days and plants with low size and compact architecture -attributes increasingly desired in soybean genetic breeding programs (Souza et al, 2010). Another factor that influences soybean growth and yield is the supply of nitrogen (N).…”

Section: Introductionmentioning

confidence: 99%

Soybean growth affected by seeding rate and mineral nitrogen

Werner

Balbinot

Ferreira

et al. 2016

Rev. bras. eng. agríc. ambient.

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A B S T R A C TThis study aimed to evaluate the effect of seeding rates and nitrogen (N) fertilization on plant growth in soybean cultivar with indeterminate growth habit. Two experiments were conducted in the 2013/14 and 2014/15 growing seasons, in a complete block design with split-plot scheme and six replicates. Four seeding rates (150, 300, 440 and 560 000 viable seeds ha -1 ) and two N doses (0 and 45 kg ha -1 ) were allocated in the plots and subplots, respectively. The cultivar NK7059 RR was used. The following traits were assessed: leaf, stem and total shoot dry matter, leaf/stem dry matter ratio, stem and leaf N content, SPAD index, plant height, first pod height, number of branches per plant and grain yield. Soybean growth is not affected by the interaction of plant density and mineral N fertilization. Higher seeding rates increase plant dry matter in the initial development stages and reduce leaf/ stem ratio and the number of branches per plant. The effects of N fertilization on soybean growth vary between growing seasons, but do not affect grain yield, even considering a wide range of seeding rates.Crescimento de plantas de soja influenciado pela densidade de semeadura e nitrogênio mineral R E S U M O Neste trabalho o objetivo foi avaliar o efeito de densidades de semeadura e adubação nitrogenada sobre o crescimento de plantas de soja em cultivar com tipo de crescimento indeterminado. Dois experimentos foram conduzidos nas safras 2013/14 e 2014/15 com delineamento de blocos casualizados em parcelas subdivididas e seis repetições. Nas parcelas foram alocadas quatro densidades de semeadura (150, 300, 440 e 560 mil sementes viáveis ha -1 ) e nas subparcelas dois níveis de nitrogênio (0 e 45 kg N ha -1 ). A cultivar de soja utilizada foi a NK7059 RR. Foram avaliados a massa seca de caules, folhas e total, relação folha/caule, o teor de nitrogênio nas folhas e no caule, índice SPAD, altura de plantas e da inserção da primeira vagem, número de ramos por planta e produtividade de grãos. O crescimento de plantas de soja não é afetado pela interação da densidade de semeadura e a adubação nitrogenada mineral. O aumento da densidade de semeadura incrementa a massa seca de plantas nas fases iniciais de desenvolvimento e reduz a relação folha/caule e o número de ramos por planta. O efeito da adubação nitrogenada no crescimento das plantas é variável entre as safras mas não aumenta a produtividade mesmo considerando ampla variação de densidade de semeadura.

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Relação entre densidade de plantas e genótipos de soja roundup readyTM

Cited by 35 publications

References 13 publications

Size, physiological quality, and green seed occurrence influenced by seeding rate in soybeans

Size, physiological quality, and green seed occurrence influenced by seeding rate in soybeans

Plant density and mineral nitrogen fertilization influencing yield, yield components and concentration of oil and protein in soybean grains

Soybean growth affected by seeding rate and mineral nitrogen

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