Crescimento inicial de povoamentos mistos de Eucalyptus grandis Hill ex Maiden e Toona ciliata M. Roem var. australis com supressão de macronutrientes primários

Ros, Clóvis Orlando Da; Perrando, Edison Rogério; Somavilla, Lucindo; Engel, Kauana; Predige, Daylien Mayane Sossmeier Albring; Silva, Rodrigo Ferreira; Silva, Vanderlei Rodrigues

doi:10.18671/scifor.v44n111.23

Cited by 2 publications

(2 citation statements)

References 8 publications

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“…The factor "A" consists of presence or absence of limestone (0.865 g kg -1 PRNT 70%) and the factor "B", combinations of nutrients (mg kg -1 ), N (nitrogen), P (phosphorus) and K (potassium): T1: 0-0-0; T2: 0-200-150; T3: 150-0-150; T4: 150-200-0; T5: 150-200-150; T6: 150-200-300; T7: 150-400-150; T8: 300-200-150; and; T9: 300-400-300. The determination of the liming treatments and doses of NPK followed the recommendation of MAEDA & BONOLA (2012) and ROS et al (2016), assuming 150-200-150 as the recommended dosage according to the nutrients used in the present study. The treatments (NPK dosages) were then assembled in which each chemical element was omitted, the recommended dose and twice the recommended dose.…”

Section: Methodsmentioning

confidence: 99%

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Liming and macronutrient on early growth of Eucalyptus benthamii

et al. 2021

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Macronutrient suppression is one way to identify which chemical elements is the most important in the early development of seedlings of forest species. This study evaluated the initial growth of Eucalyptus benthamii seedlings through morphological and physiological variables, submitted to doses of N, P and K, and liming. The experimental design to install the experiment was completely randomized, with a 2x9 factorial scheme, in which levels of factor “A” referred to absence and presence of liming and levels of factor “B”, to the different treatments of NPK. Morphological variables of SD (stem diameter) and H (height) and the physiological variables of A (photosynthesis), E (transpiration), gs (stomatal conductance), Ci/Ca (relationship between intercellular and atmospheric CO2 concentration) and WUE (water use efficiency) were measured. For morphological variables, the absence of N directly affected the means and there was a direct relationship between increase of the dose and increase of SD and H. There was a positive relationship of P mainly in relation to shoot dry matter content (SDMC) and root dry matter content (RDMC). For the physiological variables, there was no direct response with the doses of N or P, with K being the element that most influenced the variables, especially when limestone was applied, resulting in higher averages for photosynthesis, transpiration and stomatal conductance. With the purpose of meeting the morphological and physiological demands, the recommendation for cultivation of Eucalyptus benthamii under the conditions of this study is the doses 150-200-150, without liming application.

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Section: Methodsmentioning

confidence: 99%

“…According to SMETHURST et al (2004), the greatest need for N is in the first two years of the cycle. ROS et al (2016), when studying initial growth of E. grandis with macronutrient suppression, observed that there were significant reductions in height and diameter at breast height with N suppression.…”

Section: Morphological Variablesmentioning

confidence: 99%

Liming and macronutrient on early growth of Eucalyptus benthamii

et al. 2021

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Uso de adubos de liberação lenta no crescimento inicial de clones de eucalipto

et al. 2023

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O manejo de nutrientes em plantios de eucalipto é uma prática fundamental. Dessa forma, muitos esforços são realizados para otimizar o uso dos nutrientes pelas plantas. Nesse contexto, objetivou-se avaliar as doses adequadas do adubo de liberação lenta (ALL), em comparação à aplicação de superfosfato simples (SPS) na adubação de base (AB) e o seu impacto sobre a necessidade de adubação de cobertura (AC) em mudas de um híbrido de eucalipto, cultivadas em vaso. O experimento foi disposto em delineamento em blocos casualizados em esquema fatorial 6x3, em que o primeiro fator corresponde a seis doses de AB (0, 50, 75, 100, 125% de P) de ALL e 100% para P, de superfosfato simples (SPS). O segundo fator correspondeu a três aplicações de AC (0, 1 e 2 parcelas de KCl e NH4NH3). As doses de N, P, K foram baseadas na recomendação de adubação em vasos de 300, 100 e 100 mg dm-³, respectivamente. Avaliaram-se, aos 120 dias, a altura (H), o diâmetro do colo, a área foliar (AF), o número de folhas (NF) e as massas secas da planta. Ademais, calcularam-se as doses de máxima eficiência técnica (DMET). As médias obtidas pela AB via ALL, de todas as variáveis, foram superiores ao SPS. Em relação à H, recomenda-se o uso de uma AC, com DMET de 252,56 mg dm-³, de P, por ter obtido crescimento semelhante ao SPS. Para as demais variáveis, DMET, para a AB, variou de 236,52 a 327 mg dm-³, de P. Já em relação à AC, o D, NF e a massa seca aérea não apresentaram diferenças significativas, o que evidencia a qualidade do fertilizante em suprir os nutrientes fornecidos na AC, possibilitando sua redução. Assim, a DMET indicada para plantios da espécie é 100 % ALL, garantindo crescimento inicial satisfatório e uso de apenas uma AC.

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Crescimento inicial de povoamentos mistos de Eucalyptus grandis Hill ex Maiden e Toona ciliata M. Roem var. australis com supressão de macronutrientes primários

Cited by 2 publications

References 8 publications

Liming and macronutrient on early growth of Eucalyptus benthamii

Liming and macronutrient on early growth of Eucalyptus benthamii

Uso de adubos de liberação lenta no crescimento inicial de clones de eucalipto

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