Produção e qualidade do fruto da mamona em semeio e rebrote sob estresse hídrico fenológico

Abstract

RESUMOA mamona tem grande importância socioeconômica na região Nordeste, em virtude da inclusão social e da garantia de empregos. O estudo objetivou pesquisar a sensibilidade da mamona a vários níveis de água disponível no solo em diferentes estágios fenológicos avaliando-se os efeitos na produtividade e na qualidade dos frutos em condições de semeio e rebrote. O delineamento experimental foi o de blocos ao acaso, em esquema fatorial 2 x 4 (2 cultivares: BRS Paraguaçu e BRS Nordestina e 4 níveis de água no solo: 40, 60, 80 e 100% aplicados nas fases de crescimento e frutificação) com três blocos. Os resultados foram submetidos a análise de variância F, teste de Tukey, para comparação dos cultivares e análise de regressão para a água disponível. O aumento da água no solo nos diferentes estádios fenológicos promoveu alterações significativamente positivas na produtividade e na qualidade do fruto dos dois cultivares. Ambos os ciclos, semeio e rebrote, apresentaram desempenho semelhante ressaltando-se que o melhor desempenho da mamona foi obtido quando o conteúdo de água do solo se manteve durante todo o ciclo fenológico da planta, com 100% da água disponível no solo para as plantas. Palavras-chave: Ricinus communis L., manejo da poda, irrigaçãoProduction and fruit quality of castor bean in seeding and regrowth under phenological water stress ABSTRACT The castor bean crop has a social and economical importance for the Northeast region due to the social inclusion and employment. The experiment aimed to study the sensitivity of the castor bean to soil water levels applied at different phenological stages, evaluating the production and fruit quality in the seeding and regrowth cycles. The experimental design was a randomized block in a 2 x 4 factorial scheme, consisting of two castor bean cultivars (BRS Paraguaçu and BRS Nordestina) and 4 levels of available soil water (40, 60, 80, e 100%) applied during growth and frutification with three replications. The data were analysed statistically through analysis of variance (F teste) and Tukey test was used for the comparison of the cultivars and regression analysis for the quantitative factor. The increase of soil water availability for the plant at the different phenological stages studied increased production significantly and promoted positive alterations in the fruit quality of both cultivars. Both cycles presented similar performance with an elevated quality of the final product. The best performance of the castor bean was obtained when the available soil water content during the whole phenological period was kept at 100%.

Castor Beans Quality Subjected to Different Storage Temperatures and Periods

“…In this context, research advancements have improved the production and maintenance of castor bean, which in turn determine the market value and commercial viability of this crop (Negedu et al, 2013;Silva et al, 2013;David et al, 2014;Santoso et al, 2015). With the storage of the product, in addition to its qualitative maintenance, a better time for commercialization can be achieved due to the capacity to storage the material and wait for its most attractive price (Hartmann Filho et al, 2016).…”

Dry matter and nutrient partitioning in Castor plants in two growing seasons

“…However, plant nutrient demand may not vary according to yield, as when fruiting is low, leaf and stem vegetative growth may replace the fruit as carbohydrate and nutrient sinks in the plant (Malavolta et al, 2002). Thus, it is important to know the DM and nutrient allocation pattern between castor plant organs in various growing conditions, since water availability and plants nutritional status may interfere with flowering and fruit development (Malavolta et al, 2002;Malavolta et al, 2006;Freitas et al 2010;Biscaro et al, 2012;Silva et al, 2013).…”