Qualidade De Mudas De Copaíba Produzidas Em Diferentes Substratos E Níveis De Sombreamento

Abstract

O presente trabalho teve como objetivo avaliar a influência de dois volumes de diferentes substratos e níveis de sombreamento sobre a qualidade de mudas de copaíba. O experimento foi conduzido por 130 dias em DBC casualizados no esquema fatorial 2 x 5, sendo avaliados dois volumes (180 e 280 cm³) dos substratos Bioplant®; 70% vermiculita + 30% casca de arroz carbonizada; 40% vermiculita + 30% casca de arroz carbonizada + 30% fibra de côco; 50% vermiculita + 30% casca de arroz carbonizada + 20% areia; e 70% vermiculita + 15% casca de arroz carbonizada + 15% vermicomposto. Essas dez combinações foram distribuídas aleatoriamente em quatro blocos com diferentes intensidades luminosas: 0, 30, 50 e 70% de sombreamento. O uso de 180 cm³ de substrato foi suficiente para produzir mudas de copaíba com bom desenvolvimento e índice de qualidade. Os substratos 70V+30CA, 40V+30CA+30FC, 50V+30CA+20A, 70V+15CA+15VC apresentaram-se superiores em relação ao Bioplant® para produção de mudas da espécie em estudo. Os resultados demonstraram que as mudas de copaíba comportaram-se de forma distinta em relação aos níveis de sombreamento avaliados, demonstrando possuírem grande plasticidade adaptativa.AbstractQuality of copaiba seedlings produced in two volumes of substrates and shading levels. This research aimed to evaluate the influence of two volumes of substrate and levels of shading on seedling quality of copaiba. The experiment was conducted for 130 days in a randomized block design in a 2 x 5 factorial scheme, we evaluated two volumes (180 e 280 cm³) of the five following substrates: Bioplant®, 70% vermiculite + 30% carbonized rice hulls, 40% vermiculite + 30% carbonized rice hulls + 30% coir, 50% vermiculite + 30% carbonized rice hulls + 20% sand and 70% vermiculite + 15% carbonized rice hulls + 15% vermicompost residue textiles. These ten combinations were randomly distributed in four blocks, accordingly to the following distinct brightness: 0, 30, 50 and 70 percentages of shading. The use of 180 cm³ substrate was enough to produce seedlings of copaiba with good development and quality index. The substrates 70V+30CA, 40V+30CA+30FC, 50V+30CA+20A, and 70V+15CA+15VC showed slight superiority over Bioplant® for seedlings of such species. The results revealed that the copaiba seedlings behaved differently in relation to shading levels evaluated, it demonstrates they have great adaptive plasticity.Keywords: Copaifera langsdorffii; production of seedlings; levels of brightness; containers.

Light Availability and Salt Stress on Hazel Sterculia Seedlings

“…It occurs due to the poor quality water used for irrigation and excessive use of fertilizers, turning agricultural lands into degraded lands over time, and leading to desertification. Degraded land can be rehabilitated through reforestation (Dutra et al, 2012a;Dutra et al, 2015;Cavalcante et al, 2016). According to Feikema & Baker (2011), reforesting areas with native species that have deep roots is one of the best alternatives to reduce the problems and effects of salinity in areas deforested for agriculture.…”

Soil Classes and Regional Organic Residues Affect Nutrition, Morpho-Physiology and Quality of Copaiba Seedlings

“…In addition, it has a high P content and C: N ratio lower than other residues. Lower values were observed by Dutra et al (2015), in which copaiba seedlings did not surpass 11.4 cm, 90 days after transplanting, when produced Using carbonized rice husks and rice husks in natura the same means, being lower than in the control treatment as observed in Table 4 for LAP (13.56 and 13.55 cm, respectively), a result that can be explained due to the excess of rice husks in the composition of the substrate and the lower chemical quality presented by these residues (Table 1). Further tests are needed with smaller volumes of these residues in the substrate to produce copaiba seedlings.…”

Morfometria e crescimento inicial de Copaifera pubiflora exposta à terra vegetal produzida em compostagem

“…Porém, todos os tratamentos aqui avaliados apresentaram valores de matéria seca total inferiores quando comparados com os da literatura, cujos resultados variaram de 830 e 990 mg (Augusto et al, 2003), 860 e 1.860 mg (Vieira e Weber, 2015) e entre 1.704 e 1.907 mg (Dutra et al, 2015) em plantas de C. langsdorffii, sendo que os três estudos aqui citados foram mensurados após os 120 dias de semeadura, o que pode justificar esta superioridade.…”