André Sampaio Ferreira

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

There are few studies on the interaction between soybean plant density and nitrogen fertilization. This research aimed to assess the effect of mineral nitrogen associated to different plant densities on yield, yield components and oil and protein concentrations of soybean grains. Two experiments were conducted in the 2013/2014 and 2014/2015 growing seasons, with randomized complete block design, in a split plots scheme, with six replications. Four sowing densities (150, 300, 440 and 560 thousand viable seeds∙ha-1) were allocated in the plots, and two nitrogen levels (0 and 45 kg N∙ha-1, applied at V2, using ammonium sulfate) were allocated in the subplots.

Agronomic performance of soybean cultivars in an agroforestry system1

The increasing demand for food, fibers and agro-energy, along with production upscaling, search for practical solutions in production processes and advancement in mechanization, have transformed modern agricultural activities into simplified and standardized systems. However, this model has been considered insufficient and has shown signals of saturation, because of excessive demands for energy and natural resources, which elevate production costs and increase risks of economic failure (Reynolds et al. 2007, Balbino et al. 2011, Nair 2011, Pezarico et al. 2013). ABSTRACT RESUMO

Semeadura cruzada, espaçamento entre fileiras e densidade de semeadura influenciando o crescimento e a produtividade de duas cultivares de soja

This research aims to evaluate the growth of two soybean cultivars with determinate and indeterminate growth habits under different spatial plant arrangements, including crossed rows. Two experiments were conducted, one with BRS 294 RR cultivar, which has determinate growth habit and relative maturity of 6.3 and another with BRS 359 RR, which has indeterminate growth habit and relative maturity of 6.0. In both experiments, the randomized complete block design in a 2x2x2 factorial design with three replications was used. The treatments were formed by two row spacing (0.4 and 0.6 m), two seeding rates (375,000 and 562,500 seeds ha-1, with 81% germination) and two forms of sowing (crossed and uncrossed rows). The effect of plant arrangement on the soybean growth was different between cultivars. In general, for BRS 294 RR, vigorous vegetative growth and high branching, the growth of plant community was not affected by the spatial plant arrangement. However, the highest yield was observed in the 0.6 m row spacing. For BRS 359 RR, which has compact plant architecture, the highest plant density and the lowest row spacing promoted the growth and the soil cover by plant community, but did not affect the grain yield. In both cultivars, the soybean grain yield was not affected by crossed rows.

Plant spatial arrangement affects grain production from branches and stem of soybean cultivars

Bragantia, Campinas, v. 77, n. 4, p.567-576, 2018 ABSTRACT: Phenotypic plasticity is the ability of plants to undergo changes in morphology and yield components to adapt themselves to distinct environmental conditions. The knowledge on the changes in yield components of branches and stems at varied plant spatial arrangements needs to be updated due to recent changes in soybean production system. Thus, this study aimed to evaluate the yield components of branches and stems, as well as to assess the share of these plant parts in the total grain yield of soybean cultivars with indeterminate growth type, under different spatial arrangements. The experiment was conducted during the growing seasons of 2013/2014 and 2014/2015, under a randomized complete-block design and in a 4 × 3 × 2 factorial scheme with three replications. Treatments consisted CROP PRODUCTION AND MANAGEMENT Article

Crossed rows, row spacing, and seeding rates influence the growth and yield of two soybean cultivars

This research aims to evaluate the growth of two soybean cultivars with determinate and indeterminate growth habits under different spatial plant arrangements, including crossed rows. Two experiments were conducted, one with BRS 294 RR cultivar, which has determinate growth habit and relative maturity of 6.3 and another with BRS 359 RR, which has indeterminate growth habit and relative maturity of 6.0. In both experiments, the randomized complete block design in a 2x2x2 factorial design with three replications was used. The treatments were formed by two row spacing (0.4 and 0.6 m), two seeding rates (375,000 and 562,500 seeds ha-1, with 81% germination) and two forms of sowing (crossed and uncrossed rows). The effect of plant arrangement on the soybean growth was different between cultivars. In general, for BRS 294 RR, vigorous vegetative growth and high branching, the growth of plant community was not affected by the spatial plant arrangement. However, the highest yield was observed in the 0.6 m row spacing. For BRS 359 RR, which has compact plant architecture, the highest plant density and the lowest row spacing promoted the growth and the soil cover by plant community, but did not affect the grain yield. In both cultivars, the soybean grain yield was not affected by crossed rows.

Semeadura cruzada, espaçamento entre fileiras e densidade de semeadura influenciando o crescimento de duas cultivares de soja

This research aims to evaluate the growth of two soybean cultivars with determinate and indeterminate growth habits under different spatial plant arrangements, including crossed rows. Two experiments were conducted, one with BRS 294 RR cultivar, which has determinate growth habit and relative maturity of 6.3 and another with BRS 359 RR, which has indeterminate growth habit and relative maturity of 6.0. In both experiments, the randomized complete block design in a 2x2x2 factorial design with three replications was used. The treatments were formed by two row spacing (0.4 and 0.6 m), two seeding rates (375,000 and 562,500 seeds ha-1, with 81% germination) and two forms of sowing (crossed and uncrossed rows). The effect of plant arrangement on the soybean growth was different between cultivars. In general, for BRS 294 RR, vigorous vegetative growth and high branching, the growth of plant community was not affected by the spatial plant arrangement. However, the highest yield was observed in the 0.6 m row spacing. For BRS 359 RR, which has compact plant architecture, the highest plant density and the lowest row spacing promoted the growth and the soil cover by plant community, but did not affect the grain yield. In both cultivars, the soybean grain yield was not affected by crossed rows.

Composição química dos grãos de milho em resposta à adubação mineral e inoculação com rizobactérias

Para o aumento da produtividade agricola no Pais, sao necessarios estudos para melhor aproveitamento da adubacao mineral, a fim de uma producao de graos com melhor qualidade nutricional. Este trabalho teve como objetivo avaliar o teor e o acumulo de proteina, de cinzas e de nutrientes em graos de milho provenientes de plantas submetidas a inoculacao com Pseudomonas fluorescens e cultivadas em diferentes niveis de adubacao NPK no solo. Foram testados seis tratamentos, em delineamento experimental de blocos casualizados, no esquema fatorial 3 x 2, sendo tres niveis de adubacao quimica com NPK (0,125 e 250 kg ha-1) e dois niveis de inoculante a base de P. fluorescens (com e sem), com quatro repeticoes, sendo instalado em Latossolo Vermelho eutroferrico, utilizando o cultivar de milho hibrido 30F35. Determinaram-se os teores e acumulo de N, P, K, Ca, Mg, Zn, Cu, Fe, Mn, proteina e cinzas dos graos. Os dados foram submetidos a analise de variância e as medias, comparadas pelo teste de Tukey (p < 0,05). A aplicacao de P. fluorescens via inoculacao incrementou os teores de P e K dos graos de milho, independentemente dos niveis de adubacao. Os teores dos nutrientes, de proteina e de cinzas dos graos de milho nao foram influenciados pelos niveis de adubacao mineral, com excecao do Cu, que aumentou com a elevacao dos niveis de adubacao.