Produção de Mudas de Ipê-amarelo (Tabebuia serratifolia) em Resposta a Fertilização Nitrogenada

Abstract

RESUMOEste trabalho objetivou avaliar o efeito de fontes de nitrogênio e respectivas doses sobre o crescimento e a qualidade de mudas de ipê-amarelo (Tabebuia serratifolia). As mudas foram produzidas em Latossolo Vermelho-Amarelo e as fontes de nitrogênio utilizadas foram nitrato de amônio, sulfato de amônio e nitrato de cálcio, aplicadas em cinco doses (0 mg, 75 mg, 150 mg, 225 mg e 300 mg dm -3 ) e parceladamente, aos 25, 50, 75 e 100 dias após a repicagem. Adotou-se esquema fatorial 3 × 5 no delineamento experimental, casualizado em blocos, com quatro repetições. Aos 125 dias após a repicagem, a adição do nitrogênio proporcionou efeito significativo na produção de mudas de ipê-amarelo, sendo que a fonte sulfato de amônio produziu as melhores médias para todas as características e índices avaliados. Recomenda-se, para a produção de mudas de ipê-amarelo, a utilização de sulfato de amônio na dose de 100 mg dm -3 de N.Palavras-chave: nutrição florestal, propagação de plantas, espécies nativas, nitrogênio. Production of Yellow Cortez (Tabebuia serratifolia) Seedlings in Response to Nitrogen Fertilization ABSTRACTThis work aimed to evaluate the effect of sources of nitrogen and respective levels on growth and quality of Yellow Cortez (Tabebuia serratifolia) seedlings. Seedlings were grown on a Oxisol and nitrogen sources were ammonium nitrate, ammonium sulphate and calcium nitrate, applied in five doses (0, 75, 150, 225 and 300 mg dm -3 ) and increments of 25, 50, 75 and 100 days after transplanting. The experimental design was randomized in blocks in factorial scheme (3 × 5) with four replications. At 125 days after transplanting, the addition of nitrogen provided significant effect on seedling production of Yellow Cortez (Tabebuia serratifolia), and the ammonium sulfate produced the best means for all traits and indexes evaluated. We recommend the use of ammonium sulfate at a dose of 100 mg dm -3 N for Yellow Cortez seedling.

NITROGEN SOURCES AND DOSES ON GROWTH AND QUALITY OF SEEDLINGS OF Cassia grandis AND Peltophorum dubium 1

“…Similar results, with a positive response to the application of nitrogen fertilizers, have been observed: Apuleia leiocarpa (Nicoloso et al, 2001), Eremanthus erythropappus (Venturin et al, 2005), Dalbergia nigra (Marques et al, 2006b), Samanea inopinata (Cruz et al, 2006), Piptadenia gonoacantha (Marques et al, 2009), Swietenia macrophylla (Tucci et al, 2009), Mimosa caesalpiniaefolia (Gonçalves et al, 2010), Astronium fraxinifolium (Feitosa et al, 2011), Calophyllum brasiliense (Ciriello et al, 2014), Tabebuia serratifolia (Goulart et al, 2016), Schizolobium amazonicum (Carvalho et al, 2016).…”

Growth and quality of Handroanthus serratifolius seedlings in soils incorporating amendments and inorganic residues

“…There was no significant difference in the treatments within and between the two soil textural classes in variables AP, SC and TC (Table 5). However, the values obtained in this experiment are similar to those obtained by Macedo et al (2011) in ipê-roxo (Handroanthus impetiginosus) seedlings with different substrates and shadings and to those obtained by Goulart et al (2017) when testing doses and nitrogenated sources in the production of ipê-amarelo seedlings. LAP is an excellent parameter to measure the quality of forest species seedlings, above all because it is easy and quick to measure and non-destructive.…”

“…The ipê-amarelo is propagated mainly by seminal route. Thus, as a result of the difficulties in germinating the seeds and the growing demand for good quality seedlings, it is necessary to formulate substrates that will promote the emergence, growth and quality of the seedlings (Goulart et al, 2017). Differently from plants cultivated for commercial purposes, there is little information regarding the germinative potential, development of native arboreal species seedlings and also about the composition of substrates (Afonso et al, 2012).…”

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

“…Nitrogen (N) is outstanding among the nutrients, once it is required in larger quantities by most crops (Marques et al, 2006). In forest species, Goulart et al (2017) studied Tabebuia serrafolia (Vahl) G. Nichols seedlings 125 days after transplant and verified positive responses in seedling growth in height, stem diameter, canopy dry matter and root dry matter up to the level of 100 mg dm -3 . Ciriello et al (2014) reported bigger growth in Calophyllum brasiliense Cambèss plants with the level of 40 mg dm -3 N at 10 months of age.…”