Crescimento e parâmetros cinéticos de absorção de amônio e nitrato por mudas de Eucalyptus spp submetidas a diferentes relações amônio/nitrato na presença e ausência de fósforo

Grespan, S. L.; Dias, Luiz Eduardo; Novais, R F

doi:10.1590/s0100-06831998000400012

Cited by 17 publications

(14 citation statements)

References 7 publications

(7 reference statements)

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“…Ammoniacal sources may be preferred and advantageous for plants, since the ammonium absorption presents lower metabolic energy expenditure compared to nitrate, being the nitrate reductase action in the roots not necessary (Grespan et al, 1998). Preferential response to ammonium sulfate was found for Piptadenia gonoacantha seedlings by Marques et al (2009), who observed greater growth of seedlings with the application of this source compared to ammonium nitrate and calcium nitrate.…”

Section: Discussionmentioning

confidence: 99%

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

et al. 2017

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-The demand for seedlings of Brazilian native tree species has increased due to the growing number of recovery projects for degraded areas. In order to obtain success in the revegetation, high quality seedlings should be used. Among the factors that affect the quality of seedlings there is nitrogen fertilization, since nitrogen (N) is one of the nutrients required in the largest amount by plants. Thus, this study aimed to evaluate the response of Cassia grandis and Peltophorum dubium seedlings to N sources and doses. The treatments were represented by a factorial of three sources (ammonium nitrate, calcium nitrate and ammonium sulfate) by five N doses (0, 50, 100, 150 and 200 mg dm -3 ), arranged in randomized complete block design, with four replicates. After 145 days of sowing, were obtained: height (H), collar diameter (CD), shoot dry matter (SDM), root dry matter (RDM), total dry matter (TDM), and calculated the dry matter mass ratio of shoot and root (SDM/RDM) and the Dickson Quality Index (DQI). Nitrogen fertilization resulted in growth gains and improved the seedlings quality of both species. However, the sources and the source × doses interaction were not significant for all variables. For the studied substrate (Red-Yellow Latosol) the recommended dose is 185 mg dm-3 of N for the production of Peltophorum dubium seedlings. For the production of Cassia grandis seedlings was not able to find the optimum dose of N.Keywords: Plants nutrition; Seedling production; Nitrogen fertilization. FONTES E DOSES DE NITROGÊNIO NO CRESCIMENTO E QUALIDADE DE MUDAS DE CASSIA GRANDIS E PELTOPHORUM DUBIUMRESUMO -A demanda por mudas de espécies nativas tem aumentado devido ao crescente número de projetos de recuperação de áreas degradadas. Para o sucesso da revegetação, devem ser utilizadas mudas de qualidade, e entre os fatores que influenciam a qualidade, destaca-se a fertilização nitrogenada, uma vez que o nitrogênio (N) é um dos nutrientes requeridos em maior quantidade pelas plantas. O objetivo deste estudo foi avaliar a resposta das mudas de Cassia grandis L. f. e Peltophorum dubium (Spreng.) Taub. às fontes e doses de N. Os tratamentos foram representados por um fatorial de três fontes (nitrato de amônio, nitrato de cálcio e sulfato de amônio) e cinco doses de N (0, 50, 100, 150 e 200 mg dm -3 ), dispostos no delineamento em blocos casualizados, com quatro repetições. Após 145 dias da semeadura, foram obtidos: altura (H), diâmetro de coleto (DC), massa de matéria seca da parte aérea (MSPA), da raiz (MSR), e total (MST), e calculada a relação entre a massa de matéria seca da parte aérea e raiz (MSPA/MSR) e o índice de qualidade de Dickson (IQD). A fertilização nitrogenada resultou em ganhos no crescimento e qualidade das mudas de ambas as espécies estudadas. As fontes e a interação fontes × doses não foram significativas para todas as variáveis estudadas. Para as condições estudadas, recomenda-se a dose de 185 mg dm-³ de N para a produção de mudas de Peltophorum dubium. Para a produção de mudas de Cassia grandi...

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Section: Discussionmentioning

confidence: 99%

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

et al. 2017

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“…This land use calls for new management techniques that would lessen impacts on biodiversity and processes of soil fertility exhaustion (Novais & Barros, 1997;Paschoal, 2005;Forrester et al, 2006). The tolerance of eucalyptus to soil acidity and high Al contents, its adaptability to low soil fertility, and the ability to absorb N from different sources (Neves et al, 1990;Grespan et al, 1998) suggest that the use of this species in mixed plantations with N 2 -fixing leguminous trees could improve soil fertility and contribute to a more sustainable land use. Recent studies showed that intercropping eucalyptus with tree legumes was not detrimental to timber yield and resulted in increased soil N availability for eucalyptus (Binkley et al, 1992;Forrester et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

Soil carbon and nitrogen in pasture soil reforested with eucalyptus and guachapele

Balieiro

Pereira

Alves

et al. 2008

Rev. Bras. Ciênc. Solo

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In spite of the normally low content of organic matter found in sandy soils, it is responsible for almost the totality of cation exchange capacity (CEC), water storage and availability of plant nutrients. It is therefore important to evaluate the impact of alternative forest exploitation on the improvement of soil C and N accumulation on these soils. This study compared pure and mixed plantations of Eucalyptus grandis and Pseudosamanea guachapele, a N 2 -fixing leguminous tree, in relation to their effects on soil C and N stocks. The studied Planosol area had formerly been covered by Panicum maximum pasture for at least ten years without any fertilizer addition. To estimate C and N contents, the soil was sampled (at depths of 0-2.5; 2.5-5.0; 5.0-7.5; 7.5-10.0; 10.0-20.0 and 20.0-40.0 cm), in pure and mixed five-year-old tree plantations, as well as on adjacent pasture. The natural abundance 13 C technique was used to estimate the contribution of the soil organic C originated from the trees in the 0-10 cm soil layer. Soil C and N stocks under mixed plantation were 23.83 and 1.74 Mg ha -1 , respectively. Under guachapele, eucalyptus and pasture areas C stocks were 14.20, 17.19 and 24.24 Mg ha -1 , respectively. For these same treatments, total N contents were 0.83; 0.99 and 1.71 Mg ha -1 , respectively. Up to 40 % of the soil organic C in the mixed plantation was estimated to be derived from trees, while in pure eucalyptus and guachapele plantations these same estimates were only 19 and 27 %, respectively. Our results revealed the benefits of intercropped leguminous trees in eucalyptus plantations on soil C and N stocks. Index terms: Mixed plantations, Pseudosamanea guachapele, Eucalyptus grandis;soil organic matter, 13 C natural abundance.( RESUMO: CARBONO E NITROGÊNIO EM SOLO DE PASTAGEM REFLORESTADA COM EUCALIPTO E GUACHAPELEApesar de os teores de matéria orgânica serem normalmente baixos em solos arenosos, ela é responsável por quase a totalidade da CTC, armazenamento de água e disponibilidade de nutrientes desses solos. A avaliação de sistemas de exploração florestais alternativos, com vistas em incrementar a acumulação de C e N, devem ser incentivados. Este estudo compara plantios puros e mistos de Eucalyptus grandis e Pseudosamanea guachapele, leguminosa fixadora de N 2 , em relação os estoques de C e N do solo. Os plantios foram realizados em áreas anteriormente manejadas com Panicum maximum num Planossolo, que, por pelo menos dez anos, não recebeu qualquer fertilizante. Para estimar o C e o N estocado, foram retiradas amostras das camadas de 0-2,5; 2, 5-5,0; 5,0-7,5; 7,5-10,0; 10,0-20,0 e 20,0-40,0 cm tanto nos plantios puros e mistos, quanto na área de pasto. A técnica da abundância natural do 13 C foi utilizada na estimativa do C originado das árvores nos 10 cm superficiais. Os estoques de C e N, no plantio misto atingiu valores de 23,83 e 1,74 Mg ha -1 , respectivamente. Nos puros, de guachapele e eucalipto, e no pasto os estoques de C estimados foram de 14,20; 17,19 e 24,24 Mg ha -1 , respec...

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“…This difference in the response to the plant material under study was caused by differences in the management systems: this study was conducted using a nutrient solution in a closed system, and the ranges established by Higashi et al (2005) were for eucalyptus clonal nurseries, with drip irrigation in sand bed in an open system. The nutrient contents in the DMMC/MS decreased when N rates increased (Tables 1 and 2), which is mainly because N is rather absorbed as ammonium than as nitrate by eucalyptus (Vale et al, 1984;Shedley et al, 1993;Grespan et al, 1998). This behavior has been explained as an evolutive adaptation of the species to acid soil.…”

Section: Resultsmentioning

confidence: 98%

Effect of NPK fertilization on production and leaf nutrient content of eucalyptus minicuttings in nutrient solution

Neto

Silva

Santana

et al. 2011

Rev. Bras. Ciênc. Solo

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Crescimento e parâmetros cinéticos de absorção de amônio e nitrato por mudas de Eucalyptus spp submetidas a diferentes relações amônio/nitrato na presença e ausência de fósforo

Cited by 17 publications

References 7 publications

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

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

Soil carbon and nitrogen in pasture soil reforested with eucalyptus and guachapele

Effect of NPK fertilization on production and leaf nutrient content of eucalyptus minicuttings in nutrient solution

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