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Objetivou-se avaliar a influencia de concentracoes do fertilizante orgânico a base de Spirulina platensis sobre a producao, crescimento, teores de N, P, K e sodio e sobre as trocas gasosas de alface cv. Elba em condicoes de campo. Utilizou-se o delineamento de blocos ao acaso, com seis tratamentos, constituidos das concentracoes do fertilizante (0; 1,5; 3,0; 4,5; 6,0 e 7,5%) com seis repeticoes. No ponto de colheita da cultura foram avaliadas variaveis de producao e crescimento, os teores de nitrogenio, fosforo, potassio e sodio, bem como, as trocas gasosas das plantas com o medidor de gas infravermelho (IRGA). Os resultados obtidos mostraram que as concentracoes do fertilizante, nao afetaram a producao, o crescimento, os teores de nutrientes avaliados, assim como nao influenciaram as trocas gasosas das plantas. Production, mineral nutrition and physiological aspects of lettuce under foliar fertilization with Spirulina platensis Abstract : The objective of this study was to evaluate the influence of concentrations of organic fertilizer based on Spirulina platensis on yield, growth, in N, P, K and sodium contents and on gaseous changes of lettuce cv. Elba in field conditions. Use the design of randomized blocks, with six treatments consisting of different concentrations of fertilizer (0; 1.5; 3.0; 4.5; 6.0 and 7.5%) with six replications. At the harvest point were evaluated the growth and production, nitrogen, phosphorus, potassium and sodium, as well as gas exchange plant with infrared gas meter (IRGA). The results showed that the fertilizer concentrations did not affect production, growth, levels of nutrients evaluated, and did not influence the gas exchange of plants.

Produção, aspectos nutricionais e fisiológicos de alface sob adubação foliar com Spirulina platensis