Influência de cultivares, densidades de semeadura e doses de nitrogênio na produção integrada de arroz e peixes

Carmona, Rafael de Campos; Silva, Paulo Regis Ferreira da; Freitas, Thais Fernanda Stella de; Strieder, Mércio Luíz; Mariot, Carlos Henrique Paim

doi:10.1590/s0103-84782008000300035

Cited by 2 publications

(1 citation statement)

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“…Although there was a negative impact in plant population, the crop yield did not differ in plots with varying seed infection levels. Studies have shown that rice crops are not too sensitive to planting density with regard to yield in both irrigated rice in southern Brazil (Sousa et al 1995;Mariot et al 2003;Carmona et al 2008) and upland rice (Santos and Costa 1995;Santos et al 2002). Rice plants are able to tiller and compensate the number of panicles per area to the point of equating final kernel yield (Miller et al 1991).…”

Section: Discussionmentioning

confidence: 99%

Bipolaris oryzae seed borne inoculum and brown spot epidemics in the subtropical lowland rice-growing region of Brazil

et al. 2015

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The effect of increasing seed borne incidence levels (0, 3, 6, 12, 24 and 48 %) of Bipolaris oryzae on brown spot epidemics and crop performance was studied in eleven field trials. These trials were conducted at two sites (Bagé-BA and Cachoeirinha-CA) in the major rice-growing region of Brazil over three seasons (2008 to 2010). Disease variables assessed over time were disease incidence (INC, %) on leaves prior to flowering, and disease severity (SEV, %) on flag leaves after flowering. Kernel infection (KI, %) by B. oryzae was assessed after harvest. Crop-related variables such as plant population density (PD) and yield (YLD) were also assessed. In only three trials, all in the 2009/10 season, which had well above-normal rainfall in the early season, was the disease found at vegetative stages. In those same trials, a significant effect of seed borne inoculum was found for the area under the disease progress curve of INC and SEV. Overall mean SEV at CA (1.67 %) was higher than at BA (0.22 %). Seed borne inoculum levels did not affect final SEV and KI, which was not correlated between each other. PD was significantly reduced with the increase of seed borne inoculum levels in seven out of eight trials and at levels as high as 48 % (2009/10 season). The seed borne inoculum levels did not affect YLD, although significantly reducing PD, which may be due to the rice having a low population compensated through tillering. The risk of yield loss by sowing B. oryzae-infected seeds seems to be low and the early onset of the disease caused by increased levels of seed borne inoculum was dependent on seasonal weather conditions.

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Section: Discussionmentioning

confidence: 99%

Bipolaris oryzae seed borne inoculum and brown spot epidemics in the subtropical lowland rice-growing region of Brazil

et al. 2015

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Práticas de manejo integradas para produção de arroz irrigado

Mariot

Vieira

Silva

et al. 2009

Pesq. agropec. bras.

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Resumo -O objetivo deste trabalho foi realizar a avaliação técnica e financeira do arroz irrigado (Oryza sativa) em função da integração de práticas de manejo da cultura. O experimento foi conduzido em Cachoeirinha, RS. O delineamento experimental foi o de blocos ao acaso, com parcelas subsubdivididas, com quatro repetições. As estações de crescimento (2003/2004, 2004/2005 e 2006/2007) foram locadas na parcela principal, as épocas de semeadura (preferencial e tardia), nas subparcelas e os sistemas de práticas de manejo (baixo, médio, alto e muito alto), nas subsubparcelas. Os sistemas de práticas de manejo variaram quanto à densidade de semeadura, à adubação de base e de cobertura, à dose de herbicida e aos manejos da adubação nitrogenada de cobertura e da irrigação. A resposta em produtividade de grãos e em retorno financeiro do arroz irrigado à melhoria nas práticas de manejo foi maior na época de semeadura preferencial, no final de outubro, do que na semeadura tardia, na primeira semana de dezembro. Na época preferencial, o retorno financeiro aumentou com a melhoria nas práticas de manejo, por causa do aumento da receita, proporcionado pela maior produtividade de grãos.Termos para indexação: Oryza sativa, análise financeira, práticas culturais, produtividade de grãos. Integrated management practices for lowland rice productionAbstract -The objective of this work was to perform a technical and financial evaluation of integrated management practices for lowland rice (Oryza sativa). The experiment was carried out in Cachoeirinha, in the state of Rio Grande do Sul, Brazil. A randomized block design with split-split plots with four replications was used. The three growing seasons (2003/2004, 2004/2005, and 2006/2007) were the main plots, the sowing dates (preferential and late) were the split plots, and the management practice systems (low, average, high and very high) were the split-split plots. The management practice systems varied in terms of seeding rate, fertilizer rate, herbicide rate, nitrogen fertilizer topdress management, and irrigation management. The grain yield and financial return responses to the improvement of management practices were greater at the preferential sowing date, at the end of October, than on the first week of December. At the preferential sowing date, the financial return increased with the improvement of management practices, due to the increased income resulting from the higher grain yield.

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Influência de cultivares, densidades de semeadura e doses de nitrogênio na produção integrada de arroz e peixes

Abstract: RESUMO A produção integrada de arroz e peixes é uma prática que pode trazer benefícios aos orizicultores, diminuindo o uso de agroquímicos e o número de operações Sul, Brazil, using two cultivars ('IRGA 417' and 'IRGA 419')

Cited by 2 publications

References 4 publications

Bipolaris oryzae seed borne inoculum and brown spot epidemics in the subtropical lowland rice-growing region of Brazil

Bipolaris oryzae seed borne inoculum and brown spot epidemics in the subtropical lowland rice-growing region of Brazil

Práticas de manejo integradas para produção de arroz irrigado

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