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GROWTH OF Mimosa caesalpiniifolia Benth., UNDER SHADE IN THE NORTHEAST SEMI-ARID REGION OF BRAZIL 全文
2016
PINTO, JOSÉ RIVANILDO DE SOUZA | DOMBROSKI, JEFERSON LUIZ DALLABONA | SANTOS JUNIOR, JOSÉ HERMOGENES DOS | SOUZA, GABRIELA OLIVEIRA DE | FREITAS, ROMULO MAGNO OLIVEIRA DE
GROWTH OF Mimosa caesalpiniifolia Benth., UNDER SHADE IN THE NORTHEAST SEMI-ARID REGION OF BRAZIL 全文
2016
PINTO, JOSÉ RIVANILDO DE SOUZA | DOMBROSKI, JEFERSON LUIZ DALLABONA | SANTOS JUNIOR, JOSÉ HERMOGENES DOS | SOUZA, GABRIELA OLIVEIRA DE | FREITAS, ROMULO MAGNO OLIVEIRA DE
RESUMO: A técnica de produção de mudas para revegetação visa propiciar o melhor crescimento em um tempo mínimo, de forma a permitir bons níveis de sobrevivência e crescimento após o transplantio para o ambiente definitivo. Dentre as condições de cultivo, há o interesse em se obter os níveis de sombreamento que propiciem o melhor crescimento. Este trabalho teve por objetivo analisar o crescimento de plantas jovens de Mimosa caesalpiniifolia Benth. (sabiá) submetidas a sombreamento, no semiárido nordestino. Foram testados quatro tipos de tela de sombreamento (0, 30, 50 e 70%). Foi avaliado o comprimento da parte aérea, o diâmetro do coleto, a massa seca do caule, das folhas, da planta, e a área foliar. Foi calculada a razão de área foliar, a área foliar específica, a taxa de crescimento absoluto, a taxa de crescimento relativo e a taxa assimilatória líquida. Os níveis de sombreamento afetaram o crescimento M. caesalpinifolia, com os melhores indicadores de crescimento observados nas mudas mantidas em ambiente sob sombrite 50%, o que proporcionou aumento em altura, área foliar e massa seca das plantas, quando comparado ao tratamento a pleno sol. | ABSTRACT: Seedling production for reforestation aims to achieve the best plant growth in a minimal amount of time, to provide good survival and growth levels after transplantation. During cultivation, it is necessary to know the shading levels that lead to the best growth. The objective of this study was to assess the growth of young Mimosa caesalpiniifolia Benth. plants provided with various amounts of shade in the northeast semi-arid region of Brazil. Four types of shade cloth were tested (0, 30, 50 and 70%). Shoot length, stem diameter, stem dry matter, leaf dry matter, total dry matter and leaf area were assessed. Leaf area ratio, specific leaf area, absolute growth rate, relative growth rate and net assimilation rate were also calculated. The different shading levels affected M. caesalpinifolia growth, with the best growth indicators observed in plants grown under 50% shade, with increases in plant height, leaf area and total dry matter observed compared to the full sun condition.
显示更多 [+] 显示较少 [-]GROWTH OF Mimosa caesalpiniifolia Benth., UNDER SHADE IN THE NORTHEAST SEMI-ARID REGION OF BRAZIL 全文
2016
JOSÉ RIVANILDO DE SOUZA PINTO | JEFERSON LUIZ DALLABONA DOMBROSKI | JOSÉ HERMOGENES DOS SANTOS JUNIOR | GABRIELA OLIVEIRA DE SOUZA | ROMULO MAGNO OLIVEIRA DE FREITAS
Seedling production for reforestation aims to achieve the best plant growth in a minimal amount of time, to provide good survival and growth levels after transplantation. During cultivation, it is necessary to know the shading levels that lead to the best growth. The objective of this study was to assess the growth of young Mimosa caesalpiniifolia Benth. plants provided with various amounts of shade in the northeast semi-arid region of Brazil. Four types of shade cloth were tested (0, 30, 50 and 70%). Shoot length, stem diameter, stem dry matter, leaf dry matter, total dry matter and leaf area were assessed. Leaf area ratio, specific leaf area, absolute growth rate, relative growth rate and net assimilation rate were also calculated. The different shading levels affected M. caesalpinifolia growth, with the best growth indicators observed in plants grown under 50% shade, with increases in plant height, leaf area and total dry matter observed compared to the full sun condition.
显示更多 [+] 显示较少 [-]SUBSTRATES AND TEMPERATURES FOR THE GERMINATION OF SEEDS OF Senegalia tenuifolia (L.) BRITTON & ROSE 全文
2016
ARAÚJO2, ALCIMONE MARIA SILVA | ASSIS2, LIZ CAROLINA DA SILVA LAGOS CORTES | NOGUEIRA, NARJARA WALESSA | FREITAS, RÔMULO MAGNO OLIVEIRA DE | TORRES, SALVADOR BARROS
RESUMO: As Regras de Análise de Sementes e as Instruções para Análise de Sementes de Espécies Florestais não possuem recomendações para condução do teste de germinação da S. tenuifolia. Neste sentido, o presente trabalho foi desenvolvido com o objetivo de avaliar diferentes temperaturas e substratos para a condução do teste de germinação de sementes de S. tenuifolia. O delineamento experimental utilizado foi inteiramente casualizado, em esquema fatorial 4x3, sendo quatro substratos (rolo de papel, sobre papel, areia e vermiculita) e três temperaturas (25, 30 e 35 ºC), com quatro repetições de 25 sementes. Foram avaliadas a porcentagem de plântulas normais; índice de velocidade de germinação; comprimento da parte aérea; comprimento de raízes e massa de matéria seca de plântulas. Utilizou-se o teste de Tukey a 5% de probabilidade. Houve interação significativa entre as temperaturas e substratos testados para todas as variáveis, indicando que existe pelo menos uma combinação ideal entre os dois fatores, potencializando o processo germinativo das sementes. A germinação e o vigor de sementes de S. tenuifolia são influenciados tanto pela temperatura como pelo substrato utilizado no teste de germinação. A combinação dos substratos rolo de papel com as temperaturas de 25 e 30 ºC mostraram-se adequados para a condução do teste de germinação em sementes de S. tenuifolia. | ABSTRACT: The Rules for Seed Analysis and the Instructions for Seed Analysis of Forest Species have no recommendations for conducting the S. tenuifolia germination test. Therefore, the aim of the present study was to evaluate different temperatures and substrates to perform the germination test of S. tenuifolia seeds. The experimental design was completely randomized in a factorial 4 × 3 design and consisted of four substrates (paper roll; on paper; on sand and on vermiculite) and three temperatures (25, 30 and 35 °C), with four replicates of 25 seeds. The percentage of normal seedlings, the germination speed index, the shoot length, root length and dry mass of seedlings were evaluated. The Tukey test was used at 5% probability. There was a significant interaction between the temperatures and substrates tested for all variables, indicating that there is at least one ideal combination of the two factors that can increase the germination of seeds. The germination and vigor of S. tenuifolia seeds are influenced by the temperature and by the substrate used in the germination test. The combination of the paper roll substrates with a temperature of 25 and 30 °C was suitable for the germination of S. tenuifolia seeds.
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