Interferência de populações de Euphorbia heterophylla e Ipomoea ramosissima isoladas ou em misturas sobre a cultura de soja

Rizzardi,; Roman, E. S.; Borowski, Detlef; Marcon, Roberta K.

doi:10.1590/s0100-83582004000100004

Cited by 41 publications

(42 citation statements)

References 14 publications

(10 reference statements)

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“…Therefore, weed control is much more important than the timing of fertilizer application. These results converge to the observations of Rizzardi et al (2004).…”

Section: Soybean Biomass and Total Biomasssupporting

confidence: 92%

Effects of early compost application on no-till organic soybean

2012

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Weed control has always been an important issue in agriculture. With the advent of no-till systems, soil erosion was reduced but herbicide use was increased. Organic no-till systems try to adjust reduced erosion to the no use of herbicides. Nevertheless, this adjustment is limited by the cost of mechanical weed control. This cost may be reduced by improved cultural weed control with cover crops mulches. In this paper we report a study on the application of compost manure on an oats winter cover crop, preceding soybean, instead of on the soybean summer crop. Treatments comprised a control without compost manure, and compost manure doses of 4 and 8 Mg ha-1 applied either on oats in winter or soybean in summer, organized in a randomized block design, with five replications. In summer, plots were split into weed-controlled or not controlled subplots. The timing of application and the manure doses did not affect the oats biomass or the soybean performance. However, in summer, without water stress, the application of manure at 8 Mg ha-1 directly on soybean has reduced weed biomass in this crop.

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“…Therefore, weed control is much more important than the timing of fertilizer application. These results converge to the observations of Rizzardi et al (2004).…”

Section: Soybean Biomass and Total Biomasssupporting

confidence: 92%

Effects of early compost application on no-till organic soybean

2012

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“…Those authors reported the highest dry weight of A. tenuifolius per unit area at its highest density. Similarly, Silva et al (2008) and Rizzardi et al (2004) Means not sharing same letter in a column were significantly different at 5% probability level. ** Indicates significance at P ≤ 0.01 level of probability.…”

Section: Resultsmentioning

confidence: 62%

Wild onion (Asphodelus tenuifolius) competition in rainfed chickpea-chickpea cropping system

et al. 2015

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-Chickpea yield potential is limited by weed competition in typical chickpea growing areas of Pakistan where zero tillage crop grown on moisture conserved from rains received during the months of September and August. The objective of this work was to evaluate the growth and yield characteristics of chickpea grown in coexistence with increasing densities of wild onion (Asphodelus tenuifolius). The experiment was comprised of six density levels viz. zero, 20, 40, 80, 160 and 320 plants m -2 of A. tenuifolius. A decrease in chickpea primary and secondary branches per plant, pods per plant, seeds per pod, 100-seed weight and seed yield was observed due to more accumulation of dry matter per increasing densities of A. tenuifolius. The increase in A. tenuifolius density accelerated chickpea yield losses and reached the maximum values of 28, 35, 42, 50, 58 and 96% at 20, 40, 80, 160 and 320 A. tenuifolius plants m -2 , respectively. The yield loss estimation model showed that chickpea losses with infinite A. tenuifolius density were 60%. Yield reduction could be predicted by 2.52% with increase of one A. tenuifolius plant m -2 . It is concluded that A. tenuifolius has a strong influence on chickpea seed yield and showed a linear response at the range of densities studied. Keywords:Cicer arietinum, weed density, yield components, grain yield. de densidade viz. de zero, 20, 40, 80, 160 28, 35, 42, 50, 58 e 96% em 20, 40, 80, 160 e 320 A. tenuifolius RESUMO -Grão de bico potencial de produção é limitada pela competição com plantas daninhas em áreas de cultivo de sementes do grão típico do Paquistão, onde o plantio direto de culturas cultivadas em umidade conservada de chuvas de monção de verão. O objetivo deste trabalho foi avaliar o crescimento ea produção de grão de bico personagens cultivadas em convivência com o aumento da densidade de cebola Silvestre (Asphodelus tenuifolius). O experimento foi composto de seis níveis

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“…The highest relative yield total (RYT) compared to what is expected reflects the behavior that demonstrates that a species is more aggressive than the other and contributes to total yield more than what is expected (Radosevich, 1987). According to Rizzardi et al (2004), the reduction in soybean biomass is more intense when in the presence of morning glory (Ipomoea ramosissima) than milkweed (Euphorbia heterophylla) and this is aggravated in situations in which the weed is established prior to culturing. When in mixed infestation, the authors have found that Ipomoea ramosissima was more competitive than milkweed.…”

Section: Resultsmentioning

confidence: 99%

Soybeans Competitiveness with Morning Glory

et al. 2016

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-Weeds interfere negatively on development, yield and quality of soybeans (Glycine max). Inadequate weed control by herbicide use can select for resistant or tolerant biotypes, leading to a shift in the weed flora. An example is the increase of incidence of morning glory (Ipomoea spp.) in soybeans growing areas in South Brazil. The aim of this study was to determine the competitiveness of soybeans intercropped with I. triloba, I. indivisa and I. purpurea through a replacement experiments series. Greenhouse experiments were conducted in a completely randomized design with four replications. The first experiment was carried out aiming to get the plant population while total plant dry mass remained constant. Other experiments were done under replacement series experiments with soybeans and morning glory ratios of 100:0, 75:25, 50:50, 25:75 and 100:0 using the 250 plant m -2 defined by the preliminary experiment. Leaf area, root and shoots dry mass were assessed. Diagrams along with index interpretation were used to performed a competitiveness analysis. Soybeans showed greater competitiveness as I. triloba, I. purpurea and I. indivisa species for the leaf area, root and shoots dry mass variables. Intraspecific competition prevails between soybean plants whilst interspecific competition prevails for morning glory.Keywords: competition, I. triloba, I. indivisa, I. purpurea, replacement series. de-viola de 100:0, 75:25, 50:50, 25:75 e 100:0, com RESUMO -As plantas daninhas interferem negativamente no desenvolvimento

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Interferência de populações de Euphorbia heterophylla e Ipomoea ramosissima isoladas ou em misturas sobre a cultura de soja

Cited by 41 publications

References 14 publications

Effects of early compost application on no-till organic soybean

Effects of early compost application on no-till organic soybean

Wild onion (Asphodelus tenuifolius) competition in rainfed chickpea-chickpea cropping system

Soybeans Competitiveness with Morning Glory

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