Castor bean seeds are the raw material used for extracting oil destined to pharmaceutical and industrial ends. The appropriate application of post-harvest technologies, such as processing, is required to ensure the production of top quality seeds. Thus, this study aimed at assessing the physiological quality of seeds from two castor bean genotypes, classified according to their specific mass and size. Castor seeds of the genotypes EVF102 and EVF103 were mechanically harvested and then classified with the aid of cylindrical sieves and a densimetric table. This procedure was conducted at the processing unit of the company Sementes Goiás LTDA [Goiás Seeds Co.]. Evaluations of seed physiological quality were carried out in the Seed Laboratory of Instituto Federal Goiano, following a completely randomized design. The testing was conducted in four replicates, in a 2 x 2 x 5 factorial scheme (two genotypes x two sizes x five specific masses). The following parameters were appraised: (a) mass of one thousand seeds; (b) germination; (c) germination speed index; (d) emergence test; (e) emergence speed index; (f) electrical conductivity; and (g) accelerated aging. Genotype EVF102 seeds sized 8 mm, as classified by the densimetric table, showed the highest physiological quality, considering the germination, germination speed index, and emergence. Seeds of the genotype EVF103, sorted by size, exhibited no difference in physiological quality.
Environment and storage time influence stored seed quality, especially for oilseeds such as castor beans because they have a high lipid content and are more prone to deterioration. This study evaluated the physiological quality of seeds from three castor bean genotypes stored at 10 and 20°C for 300 days. The experimental design was completely randomized, with 4 replications, in a 2 x 6 (2 temperatures x 6 storage periods) split-plot design. The seeds were placed in low-density polypropylene bags and stored in climatic chambers at 10 and 20°C, in which the temperature and relative humidity were registered. Physiological quality (germination, germination rate index, emergence, rate of emergence, electrical conductivity and accelerated aging) were evaluated at baseline and after 60, 120, 180, 240, and 300 days of storage. Castor seeds of genotype EVF 106 showed better physiological quality when stored at 10°C. Castor seeds of genotype EVF 701 could be stored at 10 and 20°C for 300 days. Castor seeds of genotype EVF 712 presented reduced physiological quality during their 300 days in storage, regardless of temperature.
A canola é uma cultura que tem crescido no Brasil, e trata-se de uma fonte produtora de óleo. É uma cultura adaptada a climas frios e o conhecimento sobre o desenvolvimento inicial da canola pode contribuir para um melhor entendimento e estabelecimento destes híbridos em outras regiões. Objetivou-se avaliar o desempenho de plântulas de canola sob variação da profundidade de semeadura e diferentes substratos. Desta forma, foi conduzido um experimento em campo, em ambiente protegido, usando um esquema de parcelas subdivididas 2x2x3, dois substratos (areia e solo), com dois híbridos de canola (Hyola 61 e Hyola 433), em três profundidades de semeadura (1, 2 e 3 cm), com oito repetições, resultando em 96 unidades experimentais. Em cada unidade experimental semearam-se 25 sementes que foram avaliadas por meio da contagem diária da emergência, até o ponto de sua estabilização, que ocorreu no décimo dia. Assim, se iniciaram as avaliações definidas de Comprimento de raiz (CR), Comprimento de plântula inteira (CPI), Altura de plântula (ALT), Plântulas normais (PN), Plântulas anormais (PA), Emergência de plântulas (E), Índice de velocidade de emergência (IVE), Massa fresca de plântulas (MFP) e Massa seca de plântulas (MSP). Observou-se que os híbridos tiveram melhor desempenho em substrato solo, com superioridade do hibrido Hyola 433 na semeadura a 1 cm de profundidade.
Contextualización del tema: el frijol mungo es ampliamente cultivado en Asia y en Brasil, y ha surgido como una opción para el cultivo en el segundo cultivo en el Centro Oeste de Brasil, especialmente cuando se pretende la rotación con pastos; sin embargo, la aparición desigual y lenta de las plántulas de frijol mungo puede conducir a retrasos en el desarrollo del cultivo y perjudicar la posición final. Vacío de investigación: algunas de las condiciones que afectan al establecimiento inicial del cultivo son la profundidad de siembra y el tamaño de la semilla. Estos factores todavía están siendo discutidos en el entorno científico, especialmente para una cultura recientemente insertada en Brasil. Propósito del estudio: el objetivo fue evaluar el efecto del tamaño de las semillas y la estandarización de la profundidad de la siembra en el rendimiento de las plántulas de frijol mungo. Metodología: el ensayo se llevó a cabo en un Latossuelo Rojo, con clima Aw, precipitación media anual de 1300 mm y distribución bimodal. El diseño experimental utilizado fue completamente aleatorio, en un esquema factorial de 2 × 3 con 8 réplicas de 25 semillas, con un total de 48 parcelas. Los factores analizados fueron de los tamaños de semilla (3 y 4 mm) y tres profundidades de siembra (1, 2 y 3 cm). Se evaluó el índice de velocidad de emergencia (IVE), las plántulas no emergidas, las plántulas normales, la masa fresca, la masa seca y la longitud de las plántulas. Los datos se sometieron al análisis de varianza y, cuando se aplicaba una probabilidad significativa del 5%, se aplicó una prueba de Tukey para comparar los medios de los factores en estudio. Resultados y conclusiones: se verificó que, cuando se siembran a 1 cm de profundidad, las semillas de frijol mungo tienen IVE más bajo; sin embargo, obtuvieron un menor porcentaje de plántulas no relevantes para el estudio, y un mayor porcentaje de plántulas normales emergió a una profundidad de 3 cm. Por lo tanto, la profundidad más recomendada para la siembra de frijoles mungo fue de 2 cm, independientemente del tamaño de la semilla utilizada. Lo tamaño de semilla de 4 mm permitió el desarrollo de plántulas con mayor acumulación de materia seca.
applications throughout the development of the sugarcane culture. Potassium fertilization was done partially, in 30% of the furrows, and the remaining part was treated with the irrigation water. Nitrogen and potassium were spread only in the treatment with 0% water replacement. Was evaluated hydraulic capacity versus water content, at a depth of 10 cm, using RETC software. The maximum hydraulic capacity of water replacement of 75% was 24.9% lower than that seen in the water replacement of 50%.KEYWORDS: viscosity, soil texture, water depth.
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