Efeito da Época de Colheita da Planta na Composição Química das Folhas do Abacaxizeiro.

Com o objetivo de selecionar melhores épocas de colheita do abacaxizeiro (Ananas comosus L.) para obtenção de folhas visando à utilização na alimentação animal, foram determinados os pesos das folhas e os teores de matéria seca, amido, açúcares totais, celulose, hemicelulose, lignina, proteína e fenólicos totais e extafveis em água, em folhas provenientes de platnas colhidas aos 0, 30, 60, 90, 120, 150 e 180 dias após colheita dos frutos e em períodos de janeiro a junho e maio a outrubro de 1986. Concluiu-se que: 1. O peso das folhas, teores de proteínas, açúcares totais e compostos fenólicos diminuíram, e os de matéria seca e amido (plantio 2), celulose, hemicelulose e lignina aumentaram durante o período pós-colheita dos frutos. 1. As plantas devem ser colhidas na épocad de colheita dos frutos, para se ter maior massa foliar, teor protéico e menor fibra. 3. Folhas de plantas colhidas no período de janeiro a maio apresentaram melhor composição química que as colhidas de maio a outubro.Made available in DSpace on 2011-04-09T12:21:32Z (GMT). No. of bitstreams: 1 pab09out91.pdf: 433357 bytes, checksum: ec67b96aba23ecdf604d9d3855b30f4c (MD5) Previous issue date: 2002-02-07199

Leaf nutrient contents of rangpur lime rootstock as afected by N, P, K, Ca and S fertilization Concentrações foliares do porta-enxerto limoeiro 'cravo' em função da adubação N, P, K, Ca e S

Analysis of leaf nutrient contents can demonstrate plant nutritional status, identify symptoms of deficiency and toxicity, and evaluate the need to adjust fertilization programs. This research determined N:P:K:Ca:S rates for optimal nutrition of Rangpur lime - RL (Citrus limonia Osb.) rootstock, in an experiment arranged in a fractional factorial design of the (¹/25) 5(4) type, with 25 treatments distributed within five blocks. Seedlings of RL were transplanted into 3.8-dm³ containers filled with commercial growing media, when plant height = 10 cm, in a nursery. Treatments consisted of the following nutrient rates (g per plant): N = 0.31, 0.62, 1.25, 2.5 and 5; K = 0.4, 0.62, 1.25, 2.5 and 5; P = 0.35, 1.0, 2.0, 3.0 and 4.0; and Ca = 3.5, 5.0, 6.0, 7.0 and 8.0. Phosphorus and Ca were applied to the compost before transplant of seedlings, while N and K were applied later and total amounts were split into 20 weekly applications via fertigation. Nutrient sources were triple super phosphate, gypsum, NH4NO3 and KCl. Leaf nutrient concentrations of five-mo-old plants were high or in excess for N, P, K and S. Calcium and Mg concentrations were low. Greater dry mass of plants were observed at nutrient rates of N = 3.5, P = 2.7, K = 2.0, and Ca = 6.5 g per plant.<br>A determinação das concentrações foliares representa o estado nutricional das plantas, identifica deficiências e/ou excessos e avalia a necessidade de ajustar as adubações. Este trabalho objetivou determinar a melhor combinação de doses NPKCa e S que proporcione a concentração foliar responsável pela maior quantidade de matéria seca total das plantas de porta-enxerto limoeiro `Cravo', em um experimento fatorial fracionário (¹/25) 5(4), com 25 tratamentos, repartidos em cinco blocos de cinco tratamentos. As mudas do limoeiro `Cravo' (Citrus limonia Osb.) foram transplantadas para recipientes (3,8 dm³) com substrato comercial, em viveiro telado, quando atingiram 10 cm. Os tratamentos consistiram de combinações das seguintes doses (g por planta): N = 0,31; 0,62; 1,25; 2,5 e 5; K = 0,4; 0,62; 1,25; 2,5 e 5; P = 0,35; 1,0; 2,0; 3,0 e 4,0; e Ca = 3,5; 5,0; 6,0; 7,0 e 8,0. O P e o Ca foram misturados ao substrato de uma vez antes do transplantio e o N e o K após o transplantio, divididos em 20 aplicações semanais. As fontes utilizadas para os tratamentos foram superfosfato triplo, gesso, NH4NO3 e KCl. As concentrações foliares aos cinco meses de idade situaram-se na faixa alta, para os nutrientes N, P, K e S, e baixa para Ca e Mg. As doses que proporcionaram a maior produção de matéria seca e melhores concentrações foliares foram N = 3,5; P = 2,7; K = 2,0; e Ca = 6,5 g por planta

Brazilian Flora 2020: Leveraging the power of a collaborative scientific network

International audienceThe shortage of reliable primary taxonomic data limits the description of biological taxa and the understanding of biodiversity patterns and processes, complicating biogeographical, ecological, and evolutionary studies. This deficit creates a significant taxonomic impediment to biodiversity research and conservation planning. The taxonomic impediment and the biodiversity crisis are widely recognized, highlighting the urgent need for reliable taxonomic data. Over the past decade, numerous countries worldwide have devoted considerable effort to Target 1 of the Global Strategy for Plant Conservation (GSPC), which called for the preparation of a working list of all known plant species by 2010 and an online world Flora by 2020. Brazil is a megadiverse country, home to more of the world's known plant species than any other country. Despite that, Flora Brasiliensis, concluded in 1906, was the last comprehensive treatment of the Brazilian flora. The lack of accurate estimates of the number of species of algae, fungi, and plants occurring in Brazil contributes to the prevailing taxonomic impediment and delays progress towards the GSPC targets. Over the past 12 years, a legion of taxonomists motivated to meet Target 1 of the GSPC, worked together to gather and integrate knowledge on the algal, plant, and fungal diversity of Brazil. Overall, a team of about 980 taxonomists joined efforts in a highly collaborative project that used cybertaxonomy to prepare an updated Flora of Brazil, showing the power of scientific collaboration to reach ambitious goals. This paper presents an overview of the Brazilian Flora 2020 and provides taxonomic and spatial updates on the algae, fungi, and plants found in one of the world's most biodiverse countries. We further identify collection gaps and summarize future goals that extend beyond 2020. Our results show that Brazil is home to 46,975 native species of algae, fungi, and plants, of which 19,669 are endemic to the country. The data compiled to date suggests that the Atlantic Rainforest might be the most diverse Brazilian domain for all plant groups except gymnosperms, which are most diverse in the Amazon. However, scientific knowledge of Brazilian diversity is still unequally distributed, with the Atlantic Rainforest and the Cerrado being the most intensively sampled and studied biomes in the country. In times of “scientific reductionism”, with botanical and mycological sciences suffering pervasive depreciation in recent decades, the first online Flora of Brazil 2020 significantly enhanced the quality and quantity of taxonomic data available for algae, fungi, and plants from Brazil. This project also made all the information freely available online, providing a firm foundation for future research and for the management, conservation, and sustainable use of the Brazilian funga and flora