Growth and mineral nutrition of baru (Dipteryx alata Vogel) in nutrient solution

Abstract

A B S T R A C TThis study analyzed the initial growth of baru in nutrient solutions with individualized omission of mineral nutrients in greenhouse. The experimental design was completely randomized with 13 treatments and four replicates: Complete Hoagland & Arnon solution and with individualized omissions of N, P, K, Ca, Mg, S, B, Cu, Fe, Mn, Mo and Zn. At 60 days the following morphological characteristics were evaluated: height, root collar diameter, number of leaves and number of leaflets. In addition, the Dickson quality index and root/shoot ratio were calculated and root dry matter, shoot dry matter and the contents and accumulations of nutrients in the shoots of the seedlings were analyzed. Analysis of variance of the collected data was performed using the computational program Sisvar. The growth of baru seedlings, except for the variable height, was influenced by the omission of nutrients in the nutrient solution and the main limiting nutrients are K, Ca, Mg, Fe, Mn, and Mo. The absorption of nutrients by baru plants occurs differently under the individualized nutritional omissions applied to the nutrient solution.Crescimento e nutrição mineral do baru (Dipteryx alata Vogel) em solução nutritiva R E S U M O Analisou-se, neste trabalho, o crescimento inicial do baru em solução nutritiva com omissão individualizada dos nutrientes minerais em casa de vegetação. O delineamento experimental utilizado foi o inteiramente casualizado com 13 tratamentos e quatro repetições, sendo: Solução Hoagland & Arnon completa e omissões individualizadas de N, P, K, Ca, Mg, S, B, Cu, Fe, Mn, Mo e Zn. Avaliaram-se, aos 60 dias após, a instalação do experimento, características morfológicas: altura, diâmetro do coleto, número de folhas e de folíolos. Foram calculados o índice de Dickson e a relação da massa seca da raiz/massa seca da parte aérea. A massa seca das raízes e da parte aérea foi determinada e analisados os teores e acúmulo de nutrientes na parte aérea das mudas. Realizou-se a análise de variância dos dados coletados por meio do programa computacional Sisvar. O crescimento de mudas de baru, com exceção da variável altura, foi influenciado pela omissão de nutrientes na solução nutritiva sendo os principais nutrientes limitantes o K, Ca, Mg, Fe, Mn e Mo. A absorção dos nutrientes pelo baru ocorre de forma diferenciada em função das omissões nutricionais individualizadas aplicadas à solução de cultivo. Key words:native forest species hydroponics lacking nutrient technique Palavras-chave: espécie florestal nativa hidroponia técnica do nutriente faltante

Effect of deprivation of selected single nutrients on biometric parameters of cedar seedlings (Acrocarpus fraxinifolius) grown in nutritive solution

“…The pH rose to about 5.5 and very little precipitation occurred. Seedlings were then fixed by means of the stem with the help of polystyrene sheets of about 2 cm thick (Silva et al, 2016).…”

“…Besides, when the N is missing, the synthesis of proteins and nucleic acids is compromised, causing a reduced plants growth (Marschner, 2012). For example, studies have shown that deficiency of N causes a significant reduction of shoot and root dry weight in many crops (Silva et al, 2016;Moretti et al, 2011;Silva et al, 2011;Camacho et al, 2014;Corcioli et al, 2014).…”

“…This technique consists of testing a complete nutrient treatment along with treatments based on individual omissions of other crop nutrients (Silva et al, 2016) and provides semiquantitative nutrients-related data that may limit plants development (Malavolta, 1980;Vieira et al, 2008;Locatelli et al, 2007;Silva et al, 2005;Matheus et al, 2011;Silva et al, 2011;Andrade and Boaretto, 2012).…”

Plant Agronomic Features Can Predict Quality and Field Performance: A Bibliometric Analysis

“…The allocation of plant resources to root and shoot biomass production is considered a key factor in water use and field survival strategies, and in expressing maximum performance [34,113]. For example, when nutrient availability is low, plants allocate more resources to root growth and decrease assimilate availability to shoot growth, thereby, increasing the R/S ratio without affecting their nutritional status [114][115][116]. Chirino et al [71] grew Quercus suber L. plants in deep containers and found a higher accumulation of root biomass and, as a result, a higher R/S ratio compared to plants grown in shallow containers.…”

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“…Em seus estudos com mudas de jatobá (H. courbaril) e baru (Dipteryx alata Vogel), Santos (2015) e Silva et al (2016), respectivamente, verificaram que o NF foi reduzido nas mudas conduzidas na ausência de N, P, K, Ca e Mg para ambas as espécies, e na omissão total de nutrientes para o jatobá e de ferro para o baru. Mudas de mogno-brasileiro (Switenia macrophylla KING) apresentaram a mesma tendência na supressão isolada de P e de todos os nutrientes (Silva 2017).…”