Cultivares e progênies de policruzamento de trevo-branco consorciadas com gramíneas

From April 1980 to June 1981, 26 progenies and eight cultivars of white clover (Trifolium repens L.) associated with ryegrass (Lolium multiflorum Lam.) and pensacola bahiagrass (Paspalum saurae (Parodi) Parodi) were evaluated. The experiment was performed at the Agricultural Experiment Station of the Federal University of Rio Grande do Sul, Guaíba, RS, Brazil. The total dry matter (DM) yield (kg/ha) ranged from 4,112 kg/ha in the association with the cultivar Huia to 9,041 kg/ha with the progeny 78-510. DM yield of pure white clover ranged from 1,954 kg/ha (Huia cultivar) to 7,275 kg/ha (78-530 progeny). Crude protein yield ranged from 478 kg/ha in the association with Huia cultivar to 1,353 kg/ha (78-519 progeny). Hydrocianic acid yields were relatively low. All progenies and cultivars had a good persistence during the 1981 summer. Pensacola bahiagrass, due to its slow establishment and competition with the other species did not contribute to forage production.De abril de 1980 a junho de 1981, foram avaliadas 26 progênies e oito cultivares de trevo-branco (Trifolium repens L.) consorciadas com azevém (Lolium multiflorum Lam.) e pensacola (Paspalum saurae (Parodi) Parodi). O experimento foi realizado na Estação Experimental Agronômica da Universidade Federal do Rio Grande do Sul (EEA - UFRS), Guaíba, RS. Os rendimentos totais de matéria seca (MS/kg/ha) variaram de 4.112 kg para a consorciação com a cultivar Huia a 9.041 kg com a progênie 78-510. Os rendimentos de MS (kg/ha) de trevo-branco puro variaram de 1.954 kg/ha para a progênie 78-530. Os rendimentos de proteína bruta variaram de 478 kg/ha para a mistura com a cultivar Huia a 1.353 kg/ha com a progênie 78-519. Os conteúdos de ácido cianídrico do trevo-branco foram relativamente baixos. Todas as progênies e cultivares persistiram bem durante o verão de 1981. O pensacola, em virtude do lento estabelecimento e da competição das outras espécies, não contribuiu para a produção de forragem

Estudo fitoquímico de folhas de Solanum lycocarpum A. St.-Hil (Solanaceae) e sua aplicação na alelopatia

(Phytochemistry of Solanum lycocarpum A.St.–Hil (Solanaceae) leaves and their application in allelopathy). Solanum lycocarpum A.St.-Hil (Solanaceae) is a typical shrub in the Cerrado of central Brazil. The allelopathic activity of aqueous extracts of the leaves and fruits of this species has already been proven in previous studies. The goal of this work was to verify the allelopathic activity of different leaf extracts of S. lycocarpum on the germination and growth of four target species. The leaves were collected, dried, triturated and submitted to two distinct methods of extraction: 1- liquid--liquid (ethyl acetate and dichloromethane) from the aqueous extract and 2- with solvents of increasing polarities (hexane, dichloromethane, ethyl acetate, acetone, methanol and water) directly from the leaves. Each extraction was made with ultrasound equipment for one hour, filtered and evaporated. From these extracts, solutions of 800, 400 and 200 ppm were prepared, and water and Logran® were used as positive and negative controls, respectively. Each solution, as well as the controls, was dissolved in DMSO for the bioassays. The target species used were lettuce, watercress, tomato and onion. To each plate, 20 seeds were added and 1 mL of the tested solutions (with 4 repetitions). The plates were incubated at 25 oC without light, and the shoots and roots of the seedlings were then measured and the percentage of germination and the inhibition of each extract were calculated. Tomato was the most sensitive to the extracts, followed by watercress, onion and lettuce. The extracts with stronger activity were AcOEt, acetone and the liquid-liquid extraction, indicating the fractions that may contain the active principles of the leaves in this species

Effect of partial grape drying on the physicochemical composition of Cabernet Sauvignon must.

The objective of this work was determine the effect of partial grape drying on the composition of Cabernet Sauvignon must.Resumo 582