CRESCIMENTO INICIAL E CONCENTRAÇÃO DE NUTRIENTES EM CLONES DE&lt;i&gt; Eucalyptus urophylla&lt;/i&gt; x &lt;i&gt;Eucalyptus grandis&lt;/i&gt; SOB INTERFERÊNCIA DE PLANTAS DANINHAS

Medeiros, Wilker Nunes; Melo, Christiane Augusta Diniz; Tibúrcio, Rafael Augusto Soares; Silva, Gustavo Soares da; Machado, Aroldo Ferreira Lopes; Santos, Leonardo David Tuffi; Ferreira, Francisco Affonso

doi:10.5902/1980509821099

Cited by 23 publications

(24 citation statements)

References 8 publications

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“…The quality pattern of seedlings can be evaluated and reached in a practical, fast and easy manner by following several morphological parameters. Cruz et al (2016) suggest as main morphological parameters to determine the quality of forest seedling, the shoot height, the stem diameter in the root collar region, the ratio shoot height/root collar diameter and as physiological parameters, Medeiros et al (2016) pointed out the nutritional status.…”

Section: Introductionmentioning

confidence: 99%

Growth and nutritional status and quality of Khaya senegalensis seedlings

Smiderle¹,

Souza²,

Chagas³

et al. 2016

RCA

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Due to the shortage of information on both mineral fertilizer and organic substrate in Khaya senegalensis, it was proposed in the current study to verify the potential of the use or not of addition of nutrient solution in the production of high quality seedlings of K. senegalensis as well as to obtain the total accumulation of macro and micronutrients in the seedlings. The experimental design was completely randomized in a factorial 2x6, being the first factor constituted by the presence and nutritious solution absence of and the second factor for times evaluation (0, 60, 80, 100, 120 and 140 days after transplanting) repetitions with four seedlings. The following growth traits (height, stem diameter and shoot and root dry mass) and seedling quality parameters (total dry mass and Dickson quality index). The addition of nutrient solution supported the increase of the determined morphological characteristics of the seedlings of K. senegalensis as well as the total accumulation of macro and micronutrients. The nutrient solution modifies the absorption dynamics of nutrients in K. senegalensis and the amount absorbed at 140 days after transplantation obeys according to the order: N>K>P>Ca>S>Mg> Fe>B>Mn>Zn>Cu. RESUMO:Em razão da escassez de informações sobre fertilizante mineral e substrato orgânico em Khaya senegalensis, propôs-se no presente estudo verificar o potencial do uso ou não de adição de solução nutritiva na produção de mudas de K. senegalensis com alta qualidade, bem como obter o acumulo total de macro e micronutrientes nas plântulas. O delineamento experimental utilizado foi o inteiramente casualizado, em esquema fatorial 2x6, sendo o primeiro fator constituído pela presença e ausência de solução nutritiva e o segundo fator pelas épocas de avaliação (0; 60; 80; 100; 120 e 140 dias após o transplantio), com quatro repetições. As plantas foram avaliadas características de crescimento (altura, diâmetro de caule e massa seca da parte aérea e radicular) e parâmetros de qualidade de mudas (massa seca total e índice de qualidade de Dickson). A adição de solução nutritiva favorece o incremento das características morfológicas determinadas das mudas de K. senegalensis, bem como no acumulo total de macro e micronutrientes. A solução nutritiva modifica a dinâmica de absorção dos nutrientes em K. senegalensis e a quantidade absorvida aos 140 DAT segue conforme à ordem: N>K>P>Ca>S>Mg >Fe>B>Mn>Zn>Cu.

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Section: Introductionmentioning

confidence: 99%

Growth and nutritional status and quality of Khaya senegalensis seedlings

Smiderle¹,

Souza²,

Chagas³

et al. 2016

RCA

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“…However, it necessary remarking that this increase is directly linked to the number of plants till the point in which there is no competition each other, that may be a limiting factor to it development. Medeiros et al (2016) reported that a grassy weed presents a higher capacity in extraction of soil micronutrients, which is an important adaptation to their environment, even in competitions with big cultures, as Eucalyptus. With a greater extraction of nutrients, its growth can be beneficed, but, with competition each other, it is limiting factor to accumulation of mass in its aerial part or root.…”

Section: Resultsmentioning

confidence: 99%

Density of Competition between Species of Urochloa Sp. in Soybean Cultivation

2018

Aust. J. Basic & Appl. Sci.

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Soybean (Glycine max (L.) Merrill) highlights in Brazilian agricultural sector, because of its importance as source of protein and vegetal oil for food security alongside corn, compounding the base of ration formulation for animals. Also, due to the development in human nutrition sector, soybean and corn are used in formulation of different foods. (Costa and Brum, 2008). During its growing period, soybean is subjected to abiotic stress such as herbivorous animals as well as invasive plants competition. Understanding the involved tools in competition between species is fundamental in agricultural systems, remarkably association between plants with different characteristics. Plants often compete with each other (intraspecific) and with other plants (interspecific) for the environmental resources, in many cases vith the allelopathic effect between species (Nepomuceno et al., 2017; Abdelmigid and Morsi, 2017). Duration of the competition time negatively influences on the development and on the yield of the culture (Almeida et al., 2014). This competition between plants leads to damages in its physiology, mainly in the decrease in chlorophyll index (Nogueira et al., 2010; Lisboa et al., 2017) and stomata conductance (Jumrani et al., 2017), which initiate a breakdown in the shape and development of soybean. Competition level in grass-culture associations depends on the intervention of factors linked to the weed community, which involves specific composition, distribution, specie, density, phase and duration of intercultural living, as well as depends on climatic conditions and treatments (Figueiredo et al., 2013). The competition released by weed is named grass competition, a problem that may initiates significant 90% loss of the yield. It also can cause problems in grains quality. That way, it is important to know the soybean cycle, so that, it is possible to know in which moment the greatest interference of weeds occurs. Managing weeds is an essential step to guarantee higher performances, especially in chemical control, once this is the more practical and efficient method (Franco et al., 2017). This work aimed to evaluate effects of density of competition between species of Urochloa sp. in soybean cultivation. MATHERIAL AND METHODS Installing the experiment: The experiment was carried out in the Vegetation House of the College of Technology and Agricultural Sciences, in São Paulo State University (Unesp), in Dracena, Brazil, in October, 2016. A completely randomized design was installed, in a 3x5 factorial scheme, with 3 different grasses species: Urochloa brizantha cv. Marandu and Piatã and Urochloa ruziziensis; and 5 different densities of grasses, with 5 repetitions, summing 75 plots or vases. BMX Potência soybean cultivar was used; it was sowed three centimeters deep in vases with 9.0 dm³ capacity and 490.6 cm² area. All vases were filled with sifted soil, originally classified as Argillaceous Ferric yellow red (Embrapa, 2013), with the following chemical attributes: pH CaCl2= 4.5; MO g/dm-3 = 4.5; P mg/dm-3 (re...

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“…The asterisk indicates a significant difference between treatments at six months after planting by the F-test at 5% probability. According to Medeiros et al (2016), the lower investment in branches and leaves due to the stress imposed by the competition can compromise the survival of seedlings in the field or generate substantial yield losses by reducing the photosynthetic apparatus of plants. The proximity between the root system of tree species and that of U. brizantha may have promoted competition for water and nutrients, suggested by the redness of the edges of the leaf blade and, later, by the dryness of the apical bud and fall of leaves of part of plants growing in coexistence with U. brizantha.…”

Section: Effect Of U Brizantha On the Survival Rate Of Tree Speciesmentioning

confidence: 99%

Growth of Tree Species in Coexistence with Palisade Grass Urochloa brizantha (Hochst. ex A. Rich.) Stapf CV. Marandu

et al. 2019

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The effect of palisade grass (Urochloa brizantha) was evaluated on the growth of five tree species from the Atlantic Forest biome in Seropédica, RJ, Brasil. This study consisted of five experiments in a completely randomized design. The effect of grass on the growth of Cedrela fissilis, Guazuma ulmifolia, Schinus terebinthifolius, Sapindus saponaria, and Hymenaea courbaril was tested in pots at each experiment. Height, collar diameter, and plant mortality were measured monthly. Shoot and root dry matter of tree species and grass were evaluated at 180 days. A strong interference of palisade grass was observed on the growth of the five studied species. The reduction of growth in height and collar diameter reached 32 and 29% in S. saponaria and 26 and 44% in G. ulmifolia, respectively. Grass interference was even higher on dry matter accumulation, promoting reductions in the shoot that ranged from 48% in H. courbaril to 90% in G. ulmifolia and S. terebinthifolius. Root dry matter of tree species was reduced between 28 and 84% in relation to the control without the presence of grass. The species C. fissilis had a mortality rate of 83% in coexistence with U. brizantha. The other species, except S. saponaria, presented mortality from 15 to 30% under competition. This study evidences the importance of controlling grasses in reforestation projects aiming higher gains in growth and survival of tree species.

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CRESCIMENTO INICIAL E CONCENTRAÇÃO DE NUTRIENTES EM CLONES DE<i> Eucalyptus urophylla</i> x <i>Eucalyptus grandis</i> SOB INTERFERÊNCIA DE PLANTAS DANINHAS

Cited by 23 publications

References 8 publications

Growth and nutritional status and quality of Khaya senegalensis seedlings

Growth and nutritional status and quality of Khaya senegalensis seedlings

Density of Competition between Species of Urochloa Sp. in Soybean Cultivation

Growth of Tree Species in Coexistence with Palisade Grass Urochloa brizantha (Hochst. ex A. Rich.) Stapf CV. Marandu

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