18 research outputs found
Desempenho AgronĂŽmico De Batata Doce Sob Diversos NĂveis De K
Sweet potato is a vegetable with great potential due to its versatility of use,which covers human food,animal feed and biofuels. However,it is still little studied,especially regarding mineral nutrition and potassium. Thus,a study was conducted to evaluate potassium fertilizer doses (0,30,60,90,120 and 150 kg/ha K2O) on mineral nutrition and yield of âBeauregardâ sweet potato in a typic Hapludult soil with low K level (0.3 mmolc/dm3). The experimental design was of randomized blocks with four repetitions. Harvest took place 123 days after seedling transplanting. Foliar K content,shoot,root and total dry matter,root total yield,root commercial yield,K accumulation,K content in the soil and K optimal economic dose were assessed. The highest foliar K content was observed at the dose of 100 kg/ha K2O,with K value of 44.6 g/kg on leaf dry matter. In soils with low K availability,the highest yield (38 t/ha) was observed at the dose of 87 kg/ha K2O. Maximum commercial yield (24.3 t/ha) was obtained at the dose of 85 kg/ha K2O,and K accumulation of 150 kg/ha in the shoot and 57 kg/ha in the root,respectively,were observed (72.5 and 27.5%). Optimal economic production was of 71 kg/ha K2O,which corresponds to 83% of the dose that maximized commercial production. © 2016,Sociedade de Olericultura do Brasil. All rights reserved.34458859
InterferĂȘncia de caruru-de-mancha sobre caracterĂsticas de crescimento e produção da beterraba
A beterraba (Beta vulgaris), importante hortaliça cultivada no Brasil, Ă© muito suscetĂvel Ă interferĂȘncia de plantas daninhas, sendo Amaranthus viridis uma das principais espĂ©cies encontradas em ĂĄreas de horticultura. O objetivo deste trabalho foi estudar a resposta da beterraba Ă competição com diferentes densidades de A. viridis, por meio da avaliação de caracterĂsticas de crescimento e produção da cultura. Um experimento em caixas, com ĂĄrea Ăștil de 0,25 mÂČ, foi conduzido em Jaboticabal-SP, Brasil, mantendo-se constante oito plantas por caixa de beterraba em convivĂȘncia com 0, 1, 2, 3, 4 e 6 plantas por caixa de A. viridis. A cultura da beterraba foi muito suscetĂvel Ă interferĂȘncia imposta por plantas de A. viridis, tendo sua ĂĄrea foliar, nĂșmero de folhas, massa seca de folhas, diĂąmetro mĂ©dio da raiz e massa fresca de raĂzes significativamente reduzidos mesmo em baixas densidades populacionais da planta daninha; a massa fresca de raĂzes foi a mais sensĂvel Ă interferĂȘncia.Table beet (Beta vulgaris), an important vegetable cultivated in Brazil, is very susceptible to weed interference, with Amaranthus viridis being one of the main species found in horticultural areas. The objective of this research was to study the response of table beet to competition at different densities of A. viridis, based on evaluation of crop growth and production characteristics. An experiment was carried out in 0.25 mÂČ pots in Jaboticabal-SP, Brazil, with 8 table beet plants per pot kept in constant coexistence with 0, 1, 2, 3, 4 and 6 plants per pot of A. viridis. The table beet crop was very susceptible to interference of A. viridis, with its leaf area, number of leaves, leaf dry mass, root mean diameter and root fresh mass being significantly reduced even under low weed densities, with root fresh mass being the most sensitive to interference