Análise econômica dos sistemas de produção com acácia-negra (&lt;i&gt;Acacia mearnsii &lt;/i&gt;de Wild.) no Rio Grande do Sul.

Schneider, Paulo Renato; Brum, Eliege Terezinha

doi:10.5902/19805098294

Cited by 6 publications

(5 citation statements)

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“…The tree component furnishes a new commercial product to landowner, important to compose productive diversity in FA (FLEIG et al, 1993). It can be wood, oil, resin, leaf, bark, rubber or nuts, as a function of the species.…”

Section: Sps As An Income Alternative For Famentioning

confidence: 99%

Silvopastoral System: A Review Regarding the Family Agriculture

Fey¹,

Malavasi²,

Malavasì³

2015

Rev. Agric. Neotrop.

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The Silvopastoral System (SPS) is understood as an interaction between trees, animals and pasture. The knowledge about the component action potentialities and limitations determines the system success or failure. The potentialities that can be highlighted are the heat reduction for animals and the improvement of the forage quality provided by the trees shadows. The reduction of pasture production at degraded systems is a limitation. The SPS is a sustainable option for family properties that produce meat and milk. The economical, social and cultural limitations are a problematic issue for the SPS adoption and it slows down the number of producers implementing it, specially the called family agriculture. The public policy deficiency to improve it, the lack of technical assistance preparation on the issue and the limited scientific knowledge about the system economical advantages are some of the difficulties to increase the SPS in Brazil. SISTEMA SILVIPASTORIL: UMA REVISÃO COM APONTAMENTOS À AGRICULTURA FAMILIAR RESUMO: O Sistema Silvipastoril (SSP) envolve a interação entre árvores, animais e pastagem. O conhecimento das potencialidades e limitações da ação de cada componente em relação aos demais componentes determina o sucesso ou fracasso na adoção do sistema.Como benefícios alcançados pode-se destacar a amenização do calor aos animais e a melhoria da qualidade da forragem proporcionada pela sombra das árvores. Já a redução na produção da pastagem em sistemas mal manejados destaca-se como limitação. O SSP é uma opção sustentável às propriedades familiares produtoras de carne e de leite. Porém, limitações de ordem econômica, social e cultural compõem uma barreira para a adoção do SSP por produtores principalmente por aqueles que fazem parte da denominada agricultura familiar (AF). A reduzida atuação de políticas públicas para incentivar esta área, a falta de preparo da assistência técnica no assunto, e o limitado conhecimento científico sobre o retorno econômico do sistema são alguns dos elementos que dificultam o crescimento do SSP em unidade da AF no Brasil. PALAVRAS-CHAVE:Sistemas agroflorestais, pastagem, pequeno agricultor.

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Section: Sps As An Income Alternative For Famentioning

confidence: 99%

Silvopastoral System: A Review Regarding the Family Agriculture

Fey¹,

Malavasi²,

Malavasì³

2015

Rev. Agric. Neotrop.

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“…One of the characteristics of black wattle stands is the use of intercropping, especially in the early years including annual crops, such as watermelon, corn and cassava, and in later years along with cattle (Fleig et al, 1993;Mora, 2002;Muller, 2006). In intercropping systems where the soil nutrient conditions, temperature and water availability are not limiting factors and pests and disease are not significant factors, growth and yield of intercropped species depends primarily on the total solar radiation intercepted by the plants during the growing period (Monteith 1978).…”

Section: Introductionmentioning

confidence: 99%

Modelling crown volume in Acacia mearnsii stands

Sanquetta¹,

Behling²,

Côrte³

et al. 2015

Afr. J. Agric. Res.

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The aim of the present study was to model the crown volume in black wattle stands (Acacia mearnsii De Wild.) in Rio Grande do Sul, Brazil. The study was carried out in plots installed in black wattle stands in area where the plantations of the species are common. Two trees in each plot of average diameter were felled to determination total height, crown length (crown height) and crown width taken twice, each measurement oriented perpendicular to the other across the bole axis and parallel to the base of the crown. To calculate crown volume (cv) widths were taken every meter starting at the base of the tree bole. Stepwise, backward, and forward variable selection methods were used to formulate the volume equations. The combined variable squared diameter and crown height (d²ch) was the most highly correlated with crown volume (r=0.84). This in turn was the variable that was integrated into the selected model, both in the stepwise and forward selection methods. The equation cv = b 1 d²ch + εi was the model that provided the best fit for predicting crown volume in black wattle stands, both in age rotation and in young stands.

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“…A contribuição dessa planta aos mais variados segmentos econômicos e industriais é ampla, tanto para a extração do tanino, a partir da casca, como para o uso da madeira, na produção de energia, celulose, papel e chapa de fibra. No Brasil, é plantada principalmente para a produção de tanino (Fleig, 1993).…”

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Phytophthora nicotianae: agente etiológico da gomose da acácia-negra no Brasil

Santos

Luz²,

Souza³

2005

Fitopatol. bras.

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(Aceito para publicação em 31/08/2004) Autor para correspondência: Álvaro F. dos Santos RESUMOA gomose, causada por Phytophthora sp., é a mais importante enfermidade da acácia-negra (Acacia mearnsii) no Rio Grande do Sul, Brasil. A identificação específica permanecia indeterminada. Procurou-se, então, identificar a espécie de Phytophthora causadora desta doença no Rio Grande do Sul, usando características fisiomorfológicas e estudos moleculares baseados no seqüenciamento das regiões de Internal Transcribed Spacer (ITS). A patogenicidade dos isolados estudados para a acácia-negra foi confirmada. Os estudos confirmaram Phytophthora nicotianae como a correta identidade dos isolados fitopatogênicos. Este é o primeiro relato de P. nicotianae em acácia-negra no Brasil.Palavras-chave adicionais: Acacoa mearnsii, patogenicidade, isolado fitopatogênico ABSTRACT Phytophthora nicotianae: causal agent of gummosis of black wattle in BrazilGummosis caused by Phytophthora sp. is the most important disease of black wattle (Acacia mearnsii) in Rio Grande do Sul, Brazil. Isolates of Phytophthora sp. associated with diseased plants were obtained from Rio Grande do Sul and their pathogenicity was confirmed. In order to elucidate the correct identity of the fungus at the species level physiomorphological characteristics were determined and molecular studies were conducted based on sequences of Internal Transcribed Spacer (ITS) region. The fungus was identified as Phytophthora. nicotianae. This is the first report of P. nicotianae on black wattle in Brazil.

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Análise econômica dos sistemas de produção com acácia-negra (<i>Acacia mearnsii </i>de Wild.) no Rio Grande do Sul.

Cited by 6 publications

References 1 publication

Silvopastoral System: A Review Regarding the Family Agriculture

Silvopastoral System: A Review Regarding the Family Agriculture

Modelling crown volume in Acacia mearnsii stands

Phytophthora nicotianae: agente etiológico da gomose da acácia-negra no Brasil

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