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

Abstract

Resumo: Objetivou-se avaliar a influência de concentrações do fertilizante orgânico a base de Spirulina platensis sobre a produção, crescimento, teores de N, P, K e sódio e sobre as trocas gasosas de alface cv. Elba em condições de campo. Utilizouse o delineamento de blocos ao acaso, com seis tratamentos, constituídos das concentrações do fertilizante (0; 1,5; 3,0; 4,5; 6,0 e 7,5%) com seis repetições. No ponto de colheita da cultura foram avaliadas variáveis de produção e crescimento, os teores de nitrogênio, fósforo, potássio e sódio, bem como, as trocas gasosas das plantas com o medidor de gás infravermelho (IRGA). Os resultados obtidos mostraram que as concentrações do fertilizante, não afetaram a produção, o crescimento, os teores de nutrientes avaliados, assim como não influenciaram as trocas gasosas das plantas. Palavras-chave:Lactuca sativa; Microalga; Nutrição, Trocas gasosas. 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.

Comparison of iron application ways in coffee seedlings

“…The shoot, root, and total DM of the plants, in the different ways and concentrations applied in the present study, agree with the results of Fe doses applied via nutrient solution (Moschini et al, 2019). Low Fe concentrations decrease shoot (Da Silva et al, 2011;Khan et al, 2020) and roots DM (Li et al, 2019), factors that were not verified in the present study with the forms and doses applied.…”

“…The primary root length, when the micronutrient Fe is applied in a solution suitable for the plant, presents more agile growth; however, in the present work, in the root length of coffee plants, it was verified that the different Fe doses applied did not present significant difference between treatments via aqueous foliar treatments of 0.30, 0.45, 0.60, 0.75, and 0.90 g Fe L -1 with the fertigation treatment on the substrate 0.30 g Fe L -1 (Da Silva et al, 2011) and it was not feasible to apply this element directly to the substrate (0.372 g Fe m -3 ). T1: Foliar 0.30 g Fe L -1 ; T2: foliar 0.45 g Fe L -1 ; T3: foliar 0.60 g Fe L -1 ; T4: foliar 0.75 g Fe L -1 ; T5: foliar 0.90 g Fe L -1 ; T6: substrate with 0.372 g Fe m -3 ; T7: aqueous solution on the substrate 0.30 g Fe L -1 .…”

“…A plant with a larger leaf area intercepts a greater amount of light and thus increases its photosynthetic rate, causing the plants to present better results (Partelli et al, 2006). When the micronutrient Fe is omitted, plants have lower values in leaf area and in the variables height, number of leaves, and stem diameter (Da Silva et al, 2011), besides it is inducing reduction in photosynthetic rate (Steduto et al, 2000).…”

Morphophysiology of Punica Granatum L. under microalgae biomass stimulation

“…and Scenedesmus are promising alternatives to obtain molybdenum, selenium and zinc within which as which plant uptakes (Silva et al, 2017;Guedes et al, 2018).…”