Browsing by Autor "Roberta Camargos de Oliveira"

Filter results by typing the first few letters
Now showing 1 - 2 of 2
  • Thumbnail Image
    Item type: Item ,
    Biostimulants in the development of tomato and collard greens seedlings
    (2021) Roberta Camargos de Oliveira; Joao Eduardo R Silva; Danyela Cristina Marques Pires; Ariel Santivañez Aguilar; José Magno Queiróz Luz
    The success of crop yields begins with the use of quality seedlings. Crops from vigorous plants respond better to phytosanitary treatments and management techniques, resulting in economic returns and better use of inputs. The objective of this study was to evaluate NPK fertilizer rates and rates of an NPK + auxin biostimulant on the effects over agronomic features of Collard Greens and salad tomato seedlings. The research consisted of two experiments in randomized block, with four replications each. Both experiments were in factorial scheme 2 x 4, consisting of the combination of two nutrient sources (NPK fertilizer 9-45-11 and biostimulant composed of NPK 9-45-11 + 400 mg kg -1 of auxin IAA), and four rates, being then 50; 100; 150 and 200% of the recommended rate of biostimulant for tomato and 50; 75; 100 and 125% of the recommended rate for Collard Greens. The biostimulant favored the development of tomato seedlings, since it provides greater root dry mass accumulation and didn’t promote seedling shedding, as it occurred in the application of NPK fertilizers. On the other hand, the Collard Greens seedlings didn’t distinguish by the presence of auxin in the biostimulant, developing greater seedlings heights with NPK application. Concentrations of 50-200% of the recommended biostimulant fertilizer didn’t interfere on root length, diameter and root dry mass of Collard Greens.
  • Thumbnail Image
    Item type: Item ,
    Fertilizantes NPK e reguladores de crescimento potencializam a formação de mudas de tomate industrial?
    (Brazilian Journal of Development, 2020) Roberta Camargos de Oliveira; João Eduardo Ribeiro Silva; Ariel Santivañez Aguilar; Guilherme Repeza Marquez; José Magno Queiróz Luz
    Objetivou-se avaliar a eficiência da aplicação de fertilizantes NPK e, o uso destes combinados a reguladores de crescimento, na produção de mudas de tomate industrial N901. O experimento foi conduzido em casa de vegetação em blocos casualizados, com quatro repetições. Os tratamentos, em esquema fatorial (4x2) +1, consistiram em quatro doses (0,5; 0,75; 1,0 e 1,25%), duas fontes de nutrientes (NPK e NPK+ regulador de crescimento) e uma testemunha, sem aplicação de nutrientes. A aplicação de NPK foi superior à aplicação do NPK + auxina para a maioria dos caracteres de desenvolvimento. A altura das plantas, comprimento da raiz, diâmetro e massa seca da parte aérea foram respectivamente: 35,29; 16,42; 18,53 e 48,6% superior quando submetidas a fertilizantes, comparado ao formulado com auxina. Doses entre 0,5 a 1,25% não influenciam o desenvolvimento de plantas de tomate N901.