Variabilidade entre procedências de paricá Schizolobium parahyba var amazonicum (Huber ex Ducke) Barneby plantadas no município de Colares - Pará

Ohashi, Selma Toyoko; Yared, J. A. G.; Neto, J. T. de Farias

doi:10.1590/s0044-59672010000100011

Cited by 19 publications

(24 citation statements)

References 21 publications

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“…Dessa forma, a dormência seria uma adaptação a ambientes perturbados, podendo as sementes permanecer no banco de sementes do solo e germinar apenas quando surgirem condições ideais ao estabelecimento das plântulas (OHASHI, 2005).…”

Section: Resultsunclassified

Métodos para acelerar e uniformizar a emergência de plântulas de Schizolobium amazonicum

Dapont¹,

Silva²,

Oliveira³

et al. 2014

Rev. Ciênc. Agron.

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RESUMO -A dormência intensa verificada em sementes de Schizolobium amazonicum dificulta o processo de formação de mudas. O objetivo deste trabalho foi testar procedimentos para acelerar e uniformizar a emergência de plântulas de paricá. Foram utilizadas sementes coletadas de diversas matrizes na Floresta Estadual do Antimary, Acre. Os tratamentos constaram de sementes intactas (testemunha), escarificação com ácido sulfúrico concentrado (imersão por 5; 10; 15; 20; 25; 30; 35; 40; 45 e 50 min), imersão em água aquecida (60 ºC, 80 ºC e 100 ºC), escarificação da porção basal da semente com lixa, escarificação com punção por meio de perfurações na maior porção lateral do tegumento, e escarificação com esmeril elétrico na lateral do tegumento. Os efeitos dos tratamentos foram avaliados por meio da emergência de plântulas (EP) e do índice de velocidade de emergência (IVE) em seis momentos de observação, além da frequencia relativa e do tempo médio de emergência nos melhores resultados. O delineamento estatístico foi o inteiramente casualizado com quatro repetições em esquema fatorial para a EP e em arranjo simples para o IVE. A máxima EP em menor tempo pode ser conseguida com uso do punção, imersão em água fervente (100 ºC) e do esmeril elétrico.Palavras-chave: Paricá. Dormência. Sementes florestais. ABSTRACT -The intense dormancy seen in seeds of Schizolobium amazonicum, known locally as paricá, makes the formation process of seedlings difficult. The aim of this work was to test procedures to accelerate and standardise the emergence of seedlings in the paricá. The seeds used were collected from various matrices in the Antimary State Forest, in the Brazilian state of Acre. Treatments consisted of intact seeds (control), scarification with concentrated sulphuric acid (immersion for 5, 10, 15, 20, 25, 30, 35, 40, 45 and 50 min), immersion in heated water (60 ºC, 80 ºC and 100 ºC ), scarification of the basal part of the seed with sandpaper, scarification with a punch by means of perforations in the largest lateral portion of the husk, and scarification with an electric emery grinder on the side of the husk. The effects of the treatments were evaluated using seedling emergence (EP) and the emergence speed index (EVI) at six observation times, as well as the relative frequency and average time of emergence for the best results. The statistical design was completely randomised with four replications in a factorial scheme for EP, and a single array for the IVE. Maximum EP can be achieved in less time by using the punch, immersion in boiling water (100ºC) and the electric grinder.

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Section: Resultsunclassified

Métodos para acelerar e uniformizar a emergência de plântulas de Schizolobium amazonicum

Dapont¹,

Silva²,

Oliveira³

et al. 2014

Rev. Ciênc. Agron.

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“…Genetics: The seeds were of unknown origin and studies have shown that the variation in progeny influences growth (Ohashi et al, 2010). This is a problem when the genetic materials are not selected for planting.…”

Section: Resultsmentioning

confidence: 99%

Agriculture and forest: A sustainable strategy in the Brazilian Amazon

Martorano

Siviero²,

Tourne³

et al. 2016

Aust J Crop Sci

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Large-scale agriculture is increasing in anthropogenically modified areas in the Amazon Basin. Crops such as soybean, maize, oil palm, and others are being introduced to supply the world demand for food and energy. However, the current challenge is to enhance the sustainability of these areas by increasing efficiency of production chains and to improve environmental services. The Amazon Basin has experienced a paradigm shift away from the traditional slash-and-burn agricultural practices, which offers decision makers the opportunity to make innovative interventions to enhance the productivity in previously degraded areas by using trees to ecological advantage. This study describes a successful experiment integrating the production of soybean and paricá (Glycine max L. and Schizolobium amazonicum) based on previous research that indicated potential topoclimatic zones for planting paricá in the Brazilian state of Pará. This paper shows that a no-tillage system reduces the effects of drought compared to conventional tillage still used by many farmers in the region. The integrated system was implemented during the 2014/2015 season in 234.6 ha in the high-potential zone in the municipality of Ulianópolis, Pará. Both soybean and paricá were planted simultaneously. Paricá was planted in 5 m x 2 m inter-tree spacing totaling 228x10 3 trees per hectare and soybean, in 4 m x 100 m spacing, distributed in nine rows with a 0.45 m inter-row distance, occupying 80% of the area. The harvested soybean production was 3.4 t ha -1 , higher than other soybean monocultures in eastern Pará. Paricá benefited from soybean fertilization in the first year: It exhibited rapid development in height (3.26 m) and average diameter (3.85 cm). Trees and crop rotation over the following years is six years for forest species and one year for each crop. Our results confirm there are alternatives to the current production systems able to diminish negative impacts resulting from monoculture. In addition, the system provided environmental services such as reduced soil erosion and increased carbon stock by soil cover with no-tillage soybean cultivation. The soybean cover contributes to increased paricá thermal regulation and lower forestry costs. We concluded that innovative interventions are important to show local farmers that it is possible to adapt an agroforest system to large-scale production, thus changing the Amazon.

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“…It is important to emphasize that log conicity and bark thickness, which were responsible for losses in rounding and debarking, are inherent parameters of each species. Such characteristics can be minimized through genetic improvement and progeny selection (Ohashi et al 2010).…”

Section: Discussionmentioning

confidence: 99%

Rotary peeling yield of Schizolobium amazonicum (Leguminosae - Caesalpinioideae)

et al. 2014

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The tropical tree Schizolobium amazonicum is native from the Amazonian forest, naturally occurring in Brazil, Peru and Colombia. This work aimed to study the veneer yield made from this species. For this purpose, 50 logs from S. amazonicum were rotary peeled in a plywood industry installed in Brazilian Amazon region. The results indicated that S. amazonicum had a peeling yield similar or even higher than those usually obtained for species traditionally used for this purpose in Brazil, like those of Pinus and Eucalyptus. It was also observed that the dendrometric parameters of the log can be used to estimate the peeling yield in this species. KEYWORDS: forest industry, wood veneer, plantation tree.Rendimento em laminação da madeira de paricá (Schizolobium amazonicum, Leguminosae -Caesalpinioideae) RESUMO O paricá (Schizolobium amazonicum) é uma espécie nativa da floresta amazônica, que ocorre naturalmente no Brasil, Peru e Colômbia. O objetivo do presente trabalho foi avaliar o rendimento em laminação da madeira de paricá. Para isso foram avaliadas toras da espécie em uma fábrica de compensado instalada na região Amazônica brasileira. Os resultados indicaram que o paricá apresenta um elevado rendimento em laminação, sendo similar ou em alguns casos até superior a espécies tradicionalmente utilizadas para esta finalidade no Brasil, como as dos gêneros Pinus e Eucalyptus. Observou-se ainda que o rendimento em laminação da espécie pode ser estimado por meio dos parâmetros dendrométricos das toras. PALAVRAS-CHAVE: indústria florestal, laminas, plantios florestais. (Leguminosae -Caesalpinioideae) Rotary peeling yield of Schizolobium amazonicum

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Variabilidade entre procedências de paricá Schizolobium parahyba var amazonicum (Huber ex Ducke) Barneby plantadas no município de Colares - Pará

Cited by 19 publications

References 21 publications

Métodos para acelerar e uniformizar a emergência de plântulas de Schizolobium amazonicum

Métodos para acelerar e uniformizar a emergência de plântulas de Schizolobium amazonicum

Agriculture and forest: A sustainable strategy in the Brazilian Amazon

Rotary peeling yield of Schizolobium amazonicum (Leguminosae - Caesalpinioideae)

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