DOSES DE POTÁSSIO E LÂMINAS DE IRRIGAÇÃO NA QUALIDADE DE MUDAS DE EUCALIPTO

A produtividade florestal depende das potencialidades genéticas das matrizes, do ambiente proposto pelos substratos, frequência de irrigação, disponibilidade de luz, nutrição e das condições fitossanitárias. Assim, objetivou-se com o presente estudo analisar os efeitos da aplicação de potássio e de irrigação na qualidade de mudas de Eucalyptus urophylla. Para tal adotou-se o delineamento experimental em parcelas subdivididas definindo as 2 lâminas de irrigação (10 mm e 15 mm) como parcelas e os 5 níveis de potássio (0; 1,2; 2,4; 4,8; e 9,6 g L-1) como subparcelas, em 5 repetições compostas por 9 plantas. A comparação entre os métodos foi feita através teste de Tukey com 5% de probabilidade. Aos 120 dias, foram avaliadas: altura da parte aérea, diâmetro do colo, massa seca da parte aérea e da raiz. O tratamento testemunha apresentou as melhores médias em todos os parâmetros, sendo considerado o mais eficiente. A lâmina de irrigação de 15 mm foi considerada a mais eficiente. Portanto, conclui-se que qualquer que seja o incremento de potássio na produção de mudas, o mesmo deve se relacionar harmonicamente com a quantidade pré-existente no substrato base e com as exigências da cultura, de maneira que haja equilíbrio entre todas as partes. Palavras-chave: manejo hídrico; rustificação; substrato; casa de sombra. IRRIGATION AND POTASSIUM LEVELS IN THE QUALITY OF EUCALYPTUS ABSTRACT: Forest productivity depends on the genetic potential of the matrices, the environment proposed by the substrates, frequency of irrigation, availability of light, nutrition and phytosanitary conditions. Thus, the aim of this study was to analyze the effects of potassium and irrigation on the quality of Eucalyptus urophylla seedlings. For this purpose, the experimental design was adopted in subdivided plots, defining the 2 layers of irrigation (10 mm and 15 mm) as plots and the 5 levels of potassium (0; 1.2; 2.4; 4.8; and 9.6 g L-1) as subplots, in 5 repetitions composed of 8 plants. The comparison between the methods was made using the Tukey test with a 5% probability. At 120 days, the following were evaluated: height of the aerial part, diameter of the neck, dry mass of the aerial part and the root. The control treatment showed the best averages in all parameters, being considered the most efficient. The 15 mm irrigation blade was considered the most efficient. Therefore, it is concluded that whatever the potassium increase in the production of seedlings, it must be harmoniously related to the pre-existing quantity in the base substrate and to the requirements of the culture, so that there is balance between all parts. Keywords: water management; rustification; substrate; shadow house.

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Growth analysis of Fafia in relation to the propagation method used

Horticultura Brasileira ◽

10.1590/s0102-05362008000300016 ◽

2008 ◽

Vol 26 (3) ◽

pp. 375-378 ◽

Cited By ~ 1

Author(s):

André May ◽

Odair A Bovi ◽

Nilson B Maia ◽

Andrea RA de Moraes ◽

Mariane Q Pinheiro

Keyword(s):

Experimental Design ◽

Aerial Part ◽

Growth Analysis ◽

Experimental Period ◽

Dry Mass ◽

Plant Propagation ◽

Pfaffia Glomerata ◽

Accumulation Curves ◽

Propagation Methods ◽

Mass Accumulation

A trial was carried out in Campinas, Brazil, from August 2005 to August 2006, in order to analyze the effect of two propagation methods (seeds and cuttings) on the development of Pfaffia glomerata (Spreng.) Pedersen. The experimental design was a completely randomized block, with five replications, and two methods of plant propagation. Plant height, aerial part dry mass and root dry mass were evaluated. Plants propagated from cuttings showed greater accumulation of dry mass on the aerial part. Root dry mass accumulation curves showed an exponential pattern, and at the end of the experimental period, the average of roots dry mass for both treatments were similar, up to 349,65 g plant-1.

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PRODUCTION AND PHYSIOLOGICAL QUALITY OF SOYBEAN SEEDS IN ORTHIC QUARTZARENIC NEOSOIL OF THE CERRADO REGION

Revista Caatinga ◽

10.1590/1983-21252015v28n414rc ◽

2015 ◽

Vol 28 (4) ◽

pp. 127-134

Author(s):

CHARLINE ZARATIN ALVES ◽

GUSTAVO MARTINS ZAQUEU ◽

ERIC FABIANO SERAGUZI ◽

AGUINALDO JOSÉ FREITAS LEAL ◽

JOSUÉ BISPO DA SILVA

Keyword(s):

Electrical Conductivity ◽

Aerial Part ◽

Water Distribution ◽

Accelerated Aging ◽

Dry Mass ◽

Soybean Seeds ◽

Scheme Design ◽

Physiological Quality ◽

Tetrazolium Test

ABSTRACT: The aim of this study was to evaluate the effect of the sowing periods in production, productivity component and physiological quality of seeds of three soybean cultivars (TMG133RR, P98Y70RR and NS7670RR) in Orthic Quartzarenic Neosoil in the cerrado region. The design used was a randomized block a factorial scheme design with four repetitions, and each plot with useful space consisted of three rows of four meters length, spaced at 0.45 meters. Field evaluations were the final stand, the height of the plants, height of the first pod insertion, the mass of 100 seeds and productivity. Already in the lab seeds were evaluated for germination and vigor (first germination count, emergency, emergence speed index, length and dry mass of the aerial part of the plant and roots, electrical conductivity, accelerated aging and tetrazolium test). It concludes that it is possible to use Orthic Quartzarenic Neosoils, located in the Cerrado region at altitudes higher than 600 m, in years and places with good water distribution in the spring-summer seasons, for grain and soybeans production, but as a first goal, the crop should be sown in the first 20 days of November otherwise it should take place in early December.

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SPATIAL DISTRIBUTION OF PHYSIOLOGICAL QUALITY OF Joannesia princeps Vell. SEEDS1

Revista Árvore ◽

10.1590/1806-90882017000400010 ◽

2018 ◽

Vol 41 (4) ◽

Author(s):

Rômulo André Beltrame ◽

José Carlos Lopes ◽

Julião Soares de Souza Lima ◽

Vagner Mauri Quinto

Keyword(s):

Spatial Distribution ◽

Root System ◽

Spatial Dependence ◽

Aerial Part ◽

Dry Mass ◽

Fresh Mass ◽

Plastic Bags ◽

Mother Plants ◽

Physiological Quality

ABSTRACT The objective of this study was to analyze the spatial distribution of the attributes that determine the physiological quality of Joannesia princeps seeds. Seeds were collected, individually from, 40 mother plants in the Horto Florestal Municipal Laerth Paiva Gama, in Alegre-ES, which constituted the georeferenced sampling mesh. For germination, the seeds tegument was cracked and was held the imbibition in gibberellic acid GA3 500 mg L-1 for 24 h in environmental chamber with temperature adjusted to 30 ºC. The seeds were sown in plastic bags of ± 600 cm3 containing soil+sand+manure in the proportion of 1:1:1. On the 65th day after sowing, the following variables were analised: emergence (E), emergence speed index (IVE), root length (CR), diameter of base (DC), shoot length of the aerial part (CPA), fresh mass of the root system (MFSR), fresh mass of the aerial part (MFPA), dry mass of the root system (MSSR) and dry mass of the aerial part (MSPA). Data were subjected to descriptive statistics, geostatistics and kriging. With the exception of CPA and MFSR, it was found spatial dependence for the other studied variables: E, IVE, CR, DC, MFPA, MSSR e MSPA; varying of 14,0 a 47,5 m, so that the lowest range for the CR and longer range and degree of spatial dependence for the IVE. The analysis of the spatial distribution of the physiological quality of seeds of J. princeps can be used as a tool to define the sampling region of seeds with high and low vigor.

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Productive and qualitative parameters of four Physalis species cultivated under colored shade nets

Revista Brasileira de Fruticultura ◽

10.1590/0100-29452018528 ◽

2018 ◽

Vol 40 (2) ◽

Author(s):

Daniel Fernandes da Silva ◽

Rafael Pio ◽

Maurizio Micheli ◽

Joyce Dória Rodrigues Soares ◽

Adalvan Daniel Martins ◽

...

Keyword(s):

Experimental Design ◽

Sun Exposure ◽

Fruit Production ◽

Amazon Region ◽

Control Treatment ◽

Light Spectrum ◽

Full Sunlight ◽

Blue Shade ◽

Brazilian Biodiversity

Abstract The genus Physalis L. has great importance in the framework of Brazilian biodiversity especially in the Amazon region. The use of colored shading nets allow manipulating the light spectrum, and thus supplying the appropriate quantity and quality of light for each species and maximizing production. The purpose of this study was to evaluate the effects of shade nets on fruit production and qualitative parameters of four species belonging to genus Physalis. The experimental design was random blocks with a 4 x 5 factorial scheme, four species of Physalis (P. peruviana, P. pubescens, P. minima and P. ixocarpa) and four colors of shade nets (white, blue, red and black), besides the control treatment under full sun exposure. Fruits were collected weekly and evaluated for longitudinal and transversal diameter and biomass with and without a calyx. Finally the percentage of calyx biomass compared to the total fruit biomass, number of fruits per plant and production were determined. A differentiated response was found among the species regarding the coloring of the converter shade nets. Plants of P. peruviana had the best productive and qualitative parameters of fruits when cultivated in full sunlight or under white shade nets, P. pubescens and P. minima when cultivated in full sunlight or under white and blue shade nets, and P. ixocarpa under red or black shade nets.

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Development of Plants in Combination of Products Associated with the Inoculation in the Soybeans Seeds Treatment

Journal of Agricultural Science ◽

10.5539/jas.v9n9p123 ◽

2017 ◽

Vol 9 (9) ◽

pp. 123

Author(s):

Everton Vinicius Zambiazzi ◽

Adriano Teodoro Bruzi ◽

Frederico Dellano Souza Silva ◽

Eric Vinicius Vieira Silva ◽

Alan Mario Zuffo ◽

...

Keyword(s):

Experimental Design ◽

Seed Treatment ◽

Aerial Part ◽

Dry Matter ◽

Dry Mass ◽

Root Mass ◽

Root Volume ◽

Foliar Nitrogen ◽

Soybean Plants ◽

Shoot Mass

The purpose of this study was to evaluate the effect of different combinations of products applied through seed treatment, associated with the inoculation, in the development of soybean plants. The experiment was conducted in a greenhouse at Federal University of Lavras (UFLA). The experimental design was a randomized complete block, with four repetitions in a factorial 4 × 11, being four soybean cultivars and 11 combinations of products associated with the inoculation in the treatment of seeds. At the stage (R1) it was evaluated: plant height, leaf area, foliar chlorophyll content, number of trifoliate leaves, dry shoot mass, dry root mass, root length, root volume, nodules total number, viable nodules total number, nodules dry mass and foliar nitrogen content. The combination of products in the treatment of seeds, do not present phytotoxic effects in the characters related to the development, except for dry matter of aerial part and root volume. The combination of products in treatment of seeds influences negatively the nodulation, especially in the treatments with presence of nematicide. The inoculation performed in isolation or combined with fungicide and insecticide (I+FI) maintains nodule levels.

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Rooting of Herbaceous and Semihardwood Cuttings of Guava cv. Século XXI, under Varying Concentrations of Indolebutyric Acid

Journal of Experimental Agriculture International ◽

10.9734/jeai/2019/v33i130135 ◽

2019 ◽

pp. 1-9

Author(s):

Jussara Cristina Firmino Da Costa ◽

Rejane Maria Nunes Mendonça ◽

Gerciane Cabral Da Silva ◽

Silvanda de Melo Silva ◽

Walter Esfrain Pereira ◽

...

Keyword(s):

Experimental Design ◽

Significant Interaction ◽

Dry Weight ◽

Psidium Guajava ◽

Commercial Production ◽

Control Treatment ◽

Distilled Water ◽

Indolebutyric Acid ◽

Rooting Of Cuttings

In the commercial production of guava seedlings (Psidium guajava L.) the quality of the cuttings, homogeneity, high percentage of rooting are the factors important to be analyzed. Therefore, as the Século XXI cultivar is recent, it is necessary to do more studies regarding the behavior of this guava to the factors that aid in the rhizogenic process. The objective of this work was to verify the concentrations of indolebutyric acid (IBA) that provide the best rooting of cuttings herbaceous and semihardwood, as well as to verify the best kind of cuttings used for vegetative propagation the guava cuttings cultivar ‘Século XXI’. The experimental design was completely randomized in a 5 x 2 + 1 factorial design, beginning with five concentrations of IBA (0, 1000, 1500, 2000 and 2500 mg L-1), two kinds of cuttings (herbaceous and semihardwood) and one control treatment (immersed in distilled water for 12 hours), with four replications and 10 cuttings per plot. In relation of the variables: the percentage of cuttings live without roots, callus, number of roots and dry weight of shoots did not present significant interaction among treatments, not adjusting to any regression model. Therefore, concluding that the herbaceous cutting is the most indicated for the propagation of guava seedlings of ‘Século XXI’; The concentration of 2500 mg L-1 of IBA promotes a higher percentage of rooted semihardwood cuttings without leaf; The hormone solution diluted with alcohol 50% (v/v) resulted in toxicity for herbaceous and semihardwood cuttings cv. Século XXI.

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Phytotonic Effect of Fungicide Mixtures Applied at Different Periods in Sweet Corn

Journal of Agricultural Science ◽

10.5539/jas.v10n12p139 ◽

2018 ◽

Vol 10 (12) ◽

pp. 139

Author(s):

Estevam M. Costa ◽

Matheus V. A. Ventura ◽

Bruno M. Nunes ◽

Roberto K. Mortate ◽

Mirian Nomura ◽

...

Keyword(s):

Experimental Design ◽

Total Mass ◽

Sweet Corn ◽

Minas Gerais ◽

Tukey Test ◽

Fungicide Mixtures ◽

Phytotoxic Effect ◽

Chemical Groups

The fungicides belonging to the chemical groups of strobilurins and triazoles have their contribution to increase the productivity of the crop by a phytotoxic effect. The objective of this study was to evaluate the effects of fungicides at different times on the quality and quality of the spikes. The experiment was conducted at the Universidade do Estado de Minas Gerais and the experimental design was in randomized blocks, with 4 replicates, factorial factorial 3 × 3 + 1, the first factor being composed of 3 combinations of fungicides and the 2 applications (49, 56 and 63 days after sowing-DAS) + 1 witness. The lot was composed of 4 rows spaced 0.45 m and the harvest was done manually at 83 DAS. The height of the plant, the height and the diameter of the glue in the first ear, total mass of ears with and without straw, grain mass per ear, length and diameter of the ears and productivity were evaluated. The data were analyzed by variance and as means compared by the Tukey test. The height of a plant was significantly affected throughout its life in the treatments at 63 days. The series were concentrated by the treatments are a non-spike mass, grain mass per spike and productivity, and pressure levels were loaded when they were performed at 63 DAS.

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Methods for overcoming dormancy in Stryphnodendron pulcherrimum seeds

Pesquisa Florestal Brasileira ◽

10.4336/2016.pfb.36.87.931 ◽

2016 ◽

Vol 36 (87) ◽

pp. 195

Author(s):

Adriano Gonçalves Pereira ◽

Eniel David Cruz ◽

Hellen Síglia Demétrio Barros

Keyword(s):

Sulfuric Acid ◽

Seed Dormancy ◽

Aerial Part ◽

Dry Mass ◽

Control Treatment ◽

Tropical Species ◽

Hard Seeds ◽

Treatment Data ◽

Mother Plants ◽

Breaking Seed Dormancy

Seed dormancy is a phenomenon observed in several tropical species. This condition causes low and non-uniform germination. The present study was designed to identify an efficient method of breaking seed dormancy in Stryphnodendron pulcherrimum. Seeds of four mother plants were subjected to the following treatments: immersion in sulfuric acid for 2, 4, 6, 8, 10 and 12 min and scarification on 150-grit sandpaper. Seeds were sown on substrate containing sand and sawdust (1:1). It was evaluate the days to onset seedlings emergence, seedlings emergence (SE), emergence speed index (ESI), germination (G), hard seeds (HS), dead seeds (DS), dormant seeds (DMS), abnormal seedlings (AS) and dry mass of aerial part (DMAP) and roots (DMR). The experimental design was completely randomized with four replications of 25 seeds for each treatment. Data were subjected to analysis of variance and means compared by Tukey's test (p < 0.05). Significant differences among treatments were observed for ESI, SE, G, HS, DMAP and DMR. Highest HS was observed in control treatment (85%). Highest G was observed in seeds scarified with sulfuric acid for 10 min (82%) and 12 min (74%). These treatments also showed highest ESI, DMAP and DMR, indicating that these scarification treatments were the most efficient in overcoming dormancy.

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Initial Growth of Amburana cearensis in Decomposed Buriti Stem Substrate and Nitrogen Doses

Journal of Agricultural Science ◽

10.5539/jas.v10n7p497 ◽

2018 ◽

Vol 10 (7) ◽

pp. 497

Author(s):

Augusto Matias de Oliveira ◽

Wéverson Lima Fonseca ◽

Tiago De Oliveira Sousa ◽

Hingrid Raiany Santos Teixeira ◽

Fernandes Antonio de Almeida ◽

...

Keyword(s):

Native Species ◽

Significant Interaction ◽

Aerial Part ◽

Slow Growth ◽

Dry Mass ◽

Initial Growth ◽

Initial Development ◽

Randomized Design ◽

Completely Randomized Design

One of the difficulties of producing native species seedlings is slow growth. The objective of this study was to evaluate the initial development of Amburana cearensis (Allem.) A. C. Smith in relation to the concentration decomposed buriti stem substratum and nitrogen doses. A completely randomized design was used in a factorial arrangement of 3 × 5 (proportions of decomposed buriti stem × nitrogen doses), with six replicates. The treatments were formulated substrates comprised of decomposed buriti stem manually mixed with soil (Dystrophic Yellow Latosol) in three proportions (0, 25 and 50%) and five nitrogen doses (0, 100, 200, 300 and 400 mg dm-3) applied in treatments. There was no significant interaction between the DRM and ND factors. However, there was an isolated effect for the following variables: Plant height (PH), stem diameter (SD), leaf number (LN), leaf area (LA), dry mass of the aerial part (DMA) and root length (RL). The best concentrations of the substrate for the variables PH, LA and DMA were 25% and 50%, whereas for SD, LN and RL, the best result was 50%. ND and other variables had good responses under recommended doses ranging from a minimum of 264.82 mg dm-3, observed in DMA, and a maximum of 400 mg dm-3, observed in RL. Both factors positively the quality of umburana seedlings.

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Profundidade de semeadura no desenvolvimento inicial de pseudocereais

Revista Verde de Agroecologia e Desenvolvimento Sustentável ◽

10.18378/rvads.v11i3.4269 ◽

2016 ◽

Vol 11 (2) ◽

pp. 182

Author(s):

Daniele Brandstetter Rodrigues ◽

Thais D'Avila Rosa ◽

Jonas Albandes Gularte ◽

Diego Cardoso de Medeiros ◽

Lilian Vanusa Madruga de Tunes

Keyword(s):

Experimental Design ◽

Analysis Of Variance ◽

Seedling Emergence ◽

Dry Mass ◽

Probability Of Error ◽

Initial Development ◽

Sowing Depth ◽

Tukey Test

O objetivo deste trabalho foi avaliar a influência da profundidade de semeadura na emergência de plântulas de sementes de amaranto e quinoa. Foram avaliados os efeitos das profundidades de 0; 0,5; 1,0; 1,5 e 2,5 cm para amaranto e de 0; 1,5; 2,5; 3,5; e 4,5 cm para quinoa, obtidas por meio de anéis de pvc, com espessura equivalente a estes valores, que foram imersos no substrato para simular as profundidades de semeadura. O delineamento experimental foi inteiramente casualizado, com quatro repetições. Os dados foram submetidos à análise de variância e as médias, comparadas pelo teste de Tukey com 5% de probabilidade de erro. Foram realizados os testes de germinação, primeira contagem de germinação, emergência de plântulas em bandejas, massa de matéria seca e peso de mil sementes. A profundidade de semeadura para o melhor desenvolvimento inicial indicada para amaranto é de até 1,5 cm, e para quinoa até 2,5 cm.Seeding depth in the initial development of pseudocerealsAbstract: The objective of this study was to evaluate the influence of sowing depth on emergence of amaranth and quinoa seeds seedlings. The effects of the depths of 0; 0.5; 1.0; 1.5 and 2.5 cm and amaranth 0; 1.5; 2.5; 3.5; quinoa and 4.5 cm, obtained from PVC rings with a thickness equivalent to these values, which were immersed in the substrate to simulate the sowing depths. The experimental design was completely randomized, with four replications. The data were submitted to analysis of variance and the means were compared by Tukey test at 5% probability of error. The germination tests were carried out, first count, seedling emergence on trays, dry mass and weight of a thousand seeds. The seeding depth for the initial development best suited for Amaranthus is up to 1.5 cm, and quinoa to 2.5 cm.

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