Nitrogen Fertilization in the Initial Growth of Khaya senegalensis A. Juss Plants Under Greenhouse Conditions

Araújo, Marcelo Marotta; Júnior, José Eduardo Dias Calixto; Barretto, Vitor Corrêa de Mattos; Pelá, Adilson; Vasconcelos, Rodrigo Tenório de; Rocha, Ednaldo Cândido

doi:10.5539/jas.v11n17p235

Cited by 2 publications

(1 citation statement)

References 12 publications

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“…3). The results are corroborated with the literature in planting regarding Acacia mangium (Sarcinelli et al, 2004) and other forest species such as Khaya senegalensis A. Juss (Araújo et al, 2019). In this study, the N contents in leaves ranged from 22 to 70 g kg -1…”

Section: Discussionsupporting

confidence: 91%

September 2022

2022

Aust J Crop Sci

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Even though Acacia mangium is able to perform Nitrogen Biological Fixation (NBF), seedlings are grown under N-fertilizer application during the initial stages of seedlings. The hypothesis tested herein is that the N supplying for Acacia seedling until the establishment of the symbiosis relationship is a required practice to enhance seedlings growth, N accumulation and Nitrogen Use Efficiency (NUE). In this sense, the goal of this study was to evaluate the implications of increasing N rates on Acacia seedlings' growth and nutritional status in earlier stages of growth. The study was performed along four months in greenhouse with increasing N rates (0, 50, 100 and 200 mg dm -3 ) applied in pots. Plant parameters evaluated included: collar diameter, height, number of leaves, shoot and root dry matter. Plant nutritional status was evaluated through N content in leaves and NUE at the end of the trial. Findings herein showed that increased N rates applied enhanced all plant parameters, as follow: height (+53%), coller diameter (+43%), number of leaves (+70%) and shoot (+52%) and roots (+68%) dry matter production. Overall, increasing N rates promoted linear increasing on plant growth. Moreover, the N rates applied also improved the N content into the leaves, stem and roots in 55, 41 and 82%, respectively. The NUE was enhanced from 1.7 to 3.9 g mg -1 and plant dry matter was correlated with N content (r = 0.88). The findings herein indicate that N uptaken by plants was efficiently converted into dry matter. The high-N rates promoted higher N accumulation in roots (leaves>roots>stem) with a reduction in N fluxes, while N-low rates increased N fluxes and a reduction of N accumulation in roots (leaves>stem>roots) was observed. Based on our results, the N supplying during Acacia seedlings' earlier stages, when seedlings are not able to perform NBF, was a promising strategy to increase plant growth as well as enhancing NUE by plants.

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Section: Discussionsupporting

confidence: 91%

September 2022

2022

Aust J Crop Sci

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Influence of Simulated Defoliation and N Fertilization on Compensatory Growth of Gmelina arborea Seedlings

Ambebe

Mendi

Shidiki

2020

JALSI

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To investigate the effect of artificial defoliation and N availability on growth of Gmelina arborea, seedlings were subjected to three artificial defoliation levels (0, 25, 50%) and four N regimes (unfertilized, 1 g N plant-1, 3 g N plant-1, 6 g N plant-1) in a field trial. The results showed that height increment was 24.09% lower in the 50% defoliation than the undefoliated and 25% defoliation treatments which were not significantly different from each other. On average, the 25% and 50% defoliation treatments reduced stem volume increment by 44.34%. Increments of diameter and biomass and leaf production were not reduced by defoliation. In terms of response to N, increments in height and stem volume rose from 8.98 cm and 8.23 mm at unfertilized to 11.39 cm and 12.13 mm at 3 g N plant-1, respectively, while number of new leaves increased by a margin of 1.51 from unfertilized to 6 g N plant-1. Total biomass increment that was unaffected by defoliation showed an increasing trend from 0.55 g at unfertilized and 1 g N to 0.83 g at 3 g N and 0.94 g at 6 g N plant-1. There was no significant interactive effect of treatments on any parameter, suggesting that the adverse effect of defoliation on growth of G. arborea seedlings may not be alleviated by N fertilization. It is encouraged that a similar study be conducted for a longer duration to ascertain if the responses are sustained or modified.

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Nitrogen Fertilization in the Initial Growth of Khaya senegalensis A. Juss Plants Under Greenhouse Conditions

Cited by 2 publications

References 12 publications

September 2022

September 2022

Influence of Simulated Defoliation and N Fertilization on Compensatory Growth of Gmelina arborea Seedlings

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