Alteração do crescimento e dos teores de nutrientes com utilização de fertilizante organomineral em cenoura

Abstract

Change in growth and nutrient content in carrots with the use of biofertilizerThe use of organo-mineral biofertilizers containing alga extracts is recent in Brazil. Thus, the objective of this study was to evaluate the effect of leaf application of Ascophyllum nodosum extract biofertilizer (Activo®) on growth and on the nutrient content of carrot. The experiment was carried out in the garden area at Paraná Federal University, in the city of Pinhais, State of Paraná, in 2009, in an organic system, using the cultivar Nantes. The treatments consisted in the application of organo-mineral biofertilizer containing alga extract in different seasons and at different concentrations. The treatments were as follows: 0.2% on the 25 th day after planting (DAP); 0.4% on the 25 th DAP; 0.2% on the 45 th DAP and 0.4% on the 45 th DAP. The applications increased shoot height, root diameter and number of leaves, which was also influenced by the concentration. Yield increased with the application of the O uso de fertilizantes organominerais contendo extratos de algas é recente no Brasil. Em vista disso, este estudo teve como objetivo avaliar o efeito da aplicação foliar de fertilizante organomineral contendo extrato da alga Ascophyllum nodosum (Activo®) no desenvolvimento e nos teores de nutrientes em cenoura. O experimento foi conduzido na área de olericultura da Universidade Federal do Paraná, no município de Pinhais, PR, no ano de 2009, em sistema orgânico, utilizando cultivar do tipo Nantes. O delineamento experimental foi inteiramente casualizado, e os tratamentos consistiram na aplicação de fertilizante organomineral à base de extrato de algas. Foi utilizado um esquema fatorial com duas doses (0,2 e 0,4%) e duas épocas de aplicação (25 e 45 dias após o plantio), e um tratamento testemunha. As aplicações aumentaram a altura da parte aérea, o diâmetro radicular e o número de folhas, sendo esta variável também influenciada pela concentração. A produtividade aumentou com a aplicação do fertilizante organomineral, independentemente da concentração e da época de aplicação. Os teores nutricionais na parte aérea e nas raízes também foram alterados em decorrência das aplicações, sendo observada diminuição dos teores foliares de Cu e dos teores radiculares de N, Ca, Mg, Cu e Zn, possivelmente em função de efeito de diluição, pelo incremento da biomassa. Conclui-se que a aplicação do fertilizante organomineral contendo extrato de algas foi benéfica ao crescimento, desenvolvimento e produção das plantas de cenoura, o que resultou em diminuição na concentração de N, Ca, Mg, Cu e Zn na raiz e de Cu na parte aérea. Palavras-chave:Ascophyllum nodosum, organomineral, cultivo orgânico.

Accumulation and export of micronutrients in potato fertilized with organic-mineral fertilizer

“…Studies conducted by Bruno et al (2007) and Oliveira et al (2007b) concluded that organo-mineral fertilizers improve crop productivity and plant morphological parameters such as length and diameter of roots, and improve the uptake of nutrients by roots (PEDROSA et al, 2007). Kaseker et al (2014) evaluating the effects of organomineral fertilizers on carrot, also noted increased accumulation of nutrients in plants, even in a highly fertile soil -conditions similar to this studyemphasizing, therefore, better efficiency of organomineral fertilizers. Figure 1 (A, B, C, D and E) shows accumulation curves of micronutrient (Cu, Fe, Mn and Zn, respectively) in potato leaves, stems and tubers during crop cycle in the organo-mineral treatment.…”

Foliar Spraying of a Seaweed-Based Biostimulant in Soybean

“…The average population size at harvest was 294,000 plants per hectare, within the recommended range for the M6410 IPRO cultivar. Although the biostimulant studied here contains auxins (STIRK et al, 2004) and can therefore potentially affect plant height (TAIZ et al, 2017), and other authors have reported an increase in this variable with the application of seaweed extracts in different crops (SILVA et al, 2010;KASEKER et al, 2014;BACKES et al, 2017), this effect was not independent of biostimulant dose and application time (Figure 2, B1 and B2). However, the aforementioned authors studied the effects of Ascophyllum nodosum application, whereas the present study used a biostimulant made from Ecklonia maxima extract.…”

Productivity of radish fertilized with different doses of bovine manure

“…These authors observed a high frequency of splits in the roots of radishes cultivated using earthworm humus and bovine manure. Kaseker et al (2014) also concluded that the application of organic fertilizers (bovine manure) may contribute to an increase in the malformation of carrot roots. Bregonci et al (2008) found that the oscillations in the water content and temperature of the soil, in particular its surface layer, resulting from high temperatures and the lack of mulch, which favors rapid evapotranspiration, contribute directly to the splitting of tuberous roots.…”