Evaluation of water loss and solute uptake during osmotic treatment of white radishes (Raphanus sativus L.) in salt-sucrose solution

White radish, scientifically known as Raphanus sativus L., is a yearly vegetable. Currently, it was being grown and widely used in the world, including Vietnam. These plants have been used as food or food processing. The osmotic treatment of vegetables involves the removal of water from plants in which the solids from the osmotic solution are transported to the plant material by osmosis. By this procedure, sucrose and saline solution are usually performed. White radishes were dehydrated in different hypertonic solutions by combined sucrose and NaCl at three different concentrations, including 9 runs. Mass transfer behaviour was applied according to three common models such as Fick’s second law, Weibull and Peleg’s equations based on the change of moisture and solid content of white radish during osmotic dehydration. The obtained results showed that the mass transfer was fast at initial stage and became slowly at the later stage. The effective moisture (Dm) and solid diffusivities (Ds) were ranged from 1.0186 to 1.2826x10-8 and from 1.0692 to 2.3322x10-8 (m2/s) respectively. The Peleg’s equation was found to be the best fitting for water loss and solid uptake thanks to the high determination coefficient (>97.64%) and the low average relative error (<3.174%). Raised up solution concentration resulted in higher water loss and mass gain.

RESPOSTA DA ALFACE EM SISTEMA AGROFLORESTAL IRRIGADO POR GOTEJAMENTO

RESPOSTA DA ALFACE EM SISTEMA AGROFLORESTAL IRRIGADO POR GOTEJAMENTO LAÍSA PRADO HURPIA1; JOEL LEANDRO DE QUEIROGA2; RONALDO ANTONIO DOS SANTOS1; ADNAH MIRIAH PEREIRA ROQUE1; ALINE DE HOLANDA NUNES MAIA2 E WALDEMORE MORICONI2 1 Departamento de Desenvolvimento Rural, Centro de Ciências Agrárias, Universidade Federal de São Carlos - UFSCar, Rodovia Anhanguera, km 174 - SP-330, CEP 13600-970, Araras, SP, Brasil, [email protected], [email protected] e [email protected]. 2 Embrapa Meio Ambiente, Empresa Brasileira de Pesquisa Agropecuária, Rodovia SP-340, Km 127,5, Tanquinho Velho, CEP: 13918-110, Jaguariúna, SP, Brasil, [email protected], [email protected] e [email protected]. 1 RESUMO Os sistemas agroflorestais (SAFs) proporcionam comumente uma otimização da área de cultivo, mão-de-obra, insumos e água, com maior estabilidade e diversificação da produção, maior eficiência no controle de plantas espontâneas e proteção do solo contra a erosão. Contudo, atualmente são escassos os estudos sobre SAFs irrigados. Desta forma, este trabalho teve como objetivo avaliar a produção da cultura da alface (Lactuca sativa L.) em cultivo solteiro e consorciado com rúcula (Eruca sativa L.) e rabanete (Raphanus sativus L.), no interior de um SAF e a pleno sol, sob irrigação por gotejamento. O estudo foi conduzido no Sítio Agroecológico da Embrapa Meio Ambiente, em Jaguariúna, SP. Os resultados demonstraram que o sistema de condução não influenciou o diâmetro horizontal da alface, enquanto o cultivo a pleno sol promoveu maior produção de massa seca e número de folhas de alface e rúcula. O rabanete apresentou folhas mais longas no SAF quando comparado ao pleno sol. O policultivo aumentou a produção por unidade de área, em 129,5% em média, em relação ao monocultivo no SAF e pleno sol. Estes resultados demonstraram que a consorciação foi vantajosa em relação ao monocultivo, ao produzir uma maior quantidade de hortaliças por unidade de área e insumos. Palavras-chave: sistema de cultivo, otimização de cultivos, irrigação localizada. HURPIA, L. P.; QUEIROGA, J. L.; SANTOS, R. A.; ROQUE, A. M. P.; MAIA, A. H. N.; MORICONI, W. RESPONSE OF LETTUCE UNDER AGROFORESTRY SYSTEM WITH DRIP IRRIGATION 2 ABSTRACT Agroforestry systems (SAFs) commonly provide optimization of the cultivation area, labor, inputs and water, with yield diversification and stability, greater efficiency in weed control and soil protection against erosion. However, studies on irrigated SAFs are currently scarce. Thus, this work aimed to evaluate the production of lettuce (Lactuca sativa L.) in single cultivation and intercropped with arugula (Eruca sativa L.) and radish (Raphanus sativus L.), grown in an agroforestry system and in full sun. The study was conducted at the Sítio Agroecológico of Embrapa Meio Ambiente (experimental farm), in the city of Jaguariúna, in the state of São Paulo, Brazil. The results showed that the conduction system did not influence the horizontal diameter of lettuce, while cultivation in full sun promoted greater production of dry mass and number of lettuce and arugula leaves. The radish showed longer leaves in SAF compared to full sun. Polyculture increased production per unit area, by 129.5% on average, compared to monoculture in SAF and full sun. These results showed that intercropping was advantageous in relation to monoculture, as it produced a greater number of vegetables per unit area and inputs. Keywords: farming system, crop optimization, localized irrigation system.

Alelopatski potencijal lucerne (Medicago sativa L.) na klijavost sjemena i rast klijanaca povrća

Cilj istraživanja bio je utvrditi alelopatski potencijal lucerne (Medicago sativa L.) na klijavost sjemena i rast klijanaca rotkvice (Raphanus sativus L.), radiča (Cichorium intybus L. var. foliosum) i rajčice (Lycopersicon esculentum Mill.). Vodeni ekstrakti pripremljeni od suhe nadzemne mase lucerne u tri koncentracije (1 %, 2,5 % i 5 %) testirani su u laboratorijskim uvjetima. Alelopatski potencijal lucerne ovisio je o test vrsti, koncentraciji vodenog ekstrakta te mjerenom parametru. Najslabije djelovanje zabilježeno je na klijavost te rast klijanaca rajčice. Povećanjem koncentracije vodenog ekstrakta povećavao se i negativni alelopatski potencijal. Najmanji utjecaj vodenih ekstrakata zabilježen je na suhu masu klijanaca test vrsta.

Embryogenesis of European Radish (Raphanus sativus L. subsp. sativus convar. radicula) in Culture of Isolated Microspores In Vitro

The European radish is one of the most unresponsive crops in the Brassicaceae family to embryogenesis in in vitro microspore culture. The aim of this work was to study the process of embryogenesis of European radish and its biological features. In this study, the embryogenesis of European radish is described in detail with illustrative data for the first time. For the first time for the entire family Brassicaceae, the following were found: microspores with intact exines with ordered-like divisions; microspores completely free of exines; and a new scheme of suspensors attachment to the apical parts of embryoids. The morphology of double and triple twin embryoids was described, and new patterns of their attachment to each other were discovered. Uneven maturation of European radish embryoids at all stages of embryogenesis was noted. The period of embryoid maturation to the globular stage of development corresponded, in terms of time, to the culture of B. napus, and into the cotyledonary stage of development, maturation was faster and amounted to 17–23 days. The rate of embryoid development with and without suspensors was the same.

Assessment of Radish (Raphanus sativus L.) Cultivars for its Yield and Yield Attributing Characters at Central Mid-Hill (Kathmandu Valley) Conditions of Nepal

A varietal study on five open pollinated cultivars of Radish viz Mino Early, Okura, Pusa Chetki, Forty Days and Miyasige with an objective to find the most superior variety was conducted at Horticultural Research Division, Khumaltar, Lalitpur in winter season for 3 years from 2016 in consecutive years. Mino Early and Forty Days are widely adopted varieties and kept as local check varieties. The trial was conducted under Randomized Complete Block Design (RCBD) with four replications. Out of the five cultivars, Okura gave significantly the highest of Root wt. (326 g), Root yield (53.85 t/ha), Root length (25.5 cm), Root diameter (53.9 mm), and Leaf wt per plant. (268 g), Days to harvest (63 days) followed by Miyasige which had Root wt (259 g), Root length (23.4 cm) Root diameter (51.9 mm), Days to harvest (66 days). Okura had 49 percent yield increment followed by Miyasige with 21.9 percent as compared to Mino Early. Hence, these two cultivars are found superior and recommended for cultivation in central mid-hills like Kathmandu valley conditions in Nepal.