49 results

Performance of ‘Vitória’ pineapple in response to humic acid application during acclimatization

Lílian Estrela Borges Baldotto, Marihus Altoé Baldotto, Validoro Bazoni Giro, Luciano Pasqualoto Canellas, Fábio Lopes Olivares, Ricardo Bressan-Smith

01/Aug/2009

The acclimatization of pineapple plantlets propagated by plant tissue culture is slow. The intensification of root growth by the use of humic acids may be useful during this process. The aim of this study was to evaluate the greenhouse acclimatization of ‘Vitória’ pineapple propagated by plant tissue culture in response to different doses of humic acids isolated from vermicompost and filter cake. Leaf anatomy, photosynthetic pigment content, shoot and root growth, and leaf nutrients were evaluated. An increase in growth […]

Accumulation of oxalic acid and calcium crystals in ectomycorrhizas of eucalypt. II- calcium oxalate crystal formation induced by ectomicorrhizal fungi in fine lateral roots

Jhon Alexander Zambrano Gonzalez, Maurício Dutra Costa, Ivo Ribeiro Silva, Júlio César Lima Neves, Nairam Félix de Barros, Arnaldo Chaer Borges

01/Jun/2009

Eucalypt is efficient at taking up Ca from the soil, however little is known about the contribution of ectomycorrhizas and organic acids to this process under field conditions. The accumulation of calcium oxalate crystals (CaOx) was evaluated in, approximately, 2,100 fine lateral roots and ectomycorrhizas of a 2.5-year-old Eucalyptus grandis x Eucalyptus urophylla hybrid, grown in a mountainous area at Viçosa, MG, Brazil. Optical and scanning electron microscopy techniques were used for CaOx observation. Abundant accumulation of calcium as druses […]

Nutrient concentration in Jatropha curcas l. leaves and fruits and estimated extraction at harvest

Bruno Galvêas Laviola, Luiz Antonio dos Santos Dias

01/Oct/2008

Knowledge about the nutritional demand of a crop is essential for fertilizer recommendation. In this study nutrient concentration and accumulation in leaves and fruits of Jatropha curcas L. were measured and nutrient extraction by fruits harvested between the 1st and 4th year of cultivation were estimated. The study was carried out at the Paraiso Farm, iin Viçosa, Minas Gerais State. Four leaf and fruit samples, each one containing 15 leaves or 20 fruits were randomly collected from an area with […]

Yield and nutritional aspects of soybean grown in cerrado soils with different textures

Flávia Cristina dos Santos, Roberto Ferreira Novais, Júlio César Lima Neves, José Marcos Foloni, Manoel Ricardo de Albuquerque Filho, João Carlos Ker

01/Oct/2008

In the recent years soybean cultivation has expanded largely in areas with sandier textures in the Cerrado. This has raised questions as to the sustainability and technical, economic and environmental viability of soybean production in these soils. Moreover, differences in the yield potential and nutrient dynamics in soil and plants are expected along a variation of soil texture. This study aimed to evaluate yield and nutritional aspects of soybean plants grown in Cerrado soils with different textures. Two databanks with […]

Increased nutritional efficiency of tomato plants inoculated with growth-promoting endophytic bacteria

Patrícia Baston Barretti, Ricardo Magela de Souza, Adélia Aziz Alexandre Pozza, Edson Ampélio Pozza, Janice Guedes de Carvalho, Jorge Teodoro de Souza

01/Aug/2008

Plant growth-promoting endophytic bacteria can increase plant nutritional efficiency thus favouring its yield. With the purpose of evaluating the influence of 10 previously selected isolates of growth-promoting endophytic bacteria on the uptake, utilization and transport of nutrients by tomato plants, greenhouse experiments were installed. The hypocotyl was cut in order to apply the endophytic bacteria to tomato seedlings cultivar Santa Clara. Fifty five days after transplanting the upper portion of the cut seedlings, the plants were collected to determine the […]

Dry matter production, root growth and calcium, phosphorus and aluminum absorption by coffea canephora and coffea arabica under influence of aluminum activity in solution

Edson Marcio Mattiello, Marcos Gervasio Pereira, Everaldo Zonta, Jocimar Mauri, José Dioenis Matiello, Paulo Geovane Meireles, [...]

01/Feb/2008

This study had the objective of evaluating the dry matter production, root growth, and the absorption and distribution of Ca, P and Al in the leaves, stem and roots of two Conilon (Coffea canephora) coffee clones (Mtl 25 and Mtl 27) and the coffee variety Catuaí Amarelo (Coffea arabica) grown in nutrient solution with increasing Al3+ activity. The plants were cultivated in 5 L pots, containing modified Hoagland & Arnold nutrient solution. After eight days of adaptation, the plants were subjected to Al […]

Nutrient accumulation in coffee fruits at four plantations altitude: calcium, magnesium and sulfur

Bruno Galvêas Laviola, Herminia Emilia Prieto Martinez, Luiz Carlos Chamhum Salomão, Cosme Damião Cruz, Sebastião Marcos Mendonça

01/Dec/2007

Crurves of fruit nutrient accumulation are tools for estimating the peaks of nutrient demand and the nutrient export form the soil. The accumulation of dry matter (DM), Ca, Mg and S was studied in fruits of Coffea arabica (L.) in the period between anthesis and maturation at four altitudes of cultivation, as well as the variation in the leaf content of the elements in productive branches. The experiment consisted of the coffee variety Catuaí IAC 44 cultivated at 720, 800, 880 […]

Nutrient accumulation in coffee fruits at two at two plantation altitudes: micronutrients

Bruno Galvêas Laviola, Herminia Emilia Prieto Martinez, Luiz Carlos Chamhum Salomão, Cosme Damião Cruz, Sebastião Marcos Mendonça, Luciana Domiciano Silva Rosado

01/Dec/2007

In view of the importance of knowing fruit micronutrients export from the soil, and the season in which its coffee-plant demand is higher, the accumulation of B, Cu, Fe, Mn and Zn in fruits as well as the variation in the leaf content of the elements in productive branches of Arabic coffee was studied. The trial was performed in the period between anthesis and maturation at two altitudes. The experiment consisted of the coffee (Coffea arabica L.) variety Catuaí IAC […]

Effects of liming on soil fertility, plant nutrition and guava yield

William Natale, Renato de Mello Prado, Danilo Eduardo Rozane, Liliane Maria Romualdo

01/Dec/2007

Soil acidity is one of the most important constraints to agricultural production in the tropics. For this reason, the objective of this research was to evaluate the effects of soil liming on the performance of guava (Psidium guajava L.) trees. The experiment took place at the Citrus Experimental Station in Bebedouro, state of São Paulo, Brazil. The soil was a Typic Haplustox (V = 26 % in the 0 to 20 cm layer) between August 1999 and July 2006. The following doses of limestone were […]

Growth and macronutrient uptake curves in guava seedling

Claudenir Facincani Franco, Renato de Mello Prado, Luiz Fernando Brachirolli, Danilo Eduardo Rozane

01/Dec/2007

The use of guava seedlings with adequate nutritional status determines the success of an orchard installation. This study was conducted to determine plant growth and macronutrient accumulation in herbaceous seedlings of two guava cultivars. The experiment was arranged in a completely randomized design in split-plots with three replications. Plots consisted of the two guava cultivars (Paluma and Século XXI) in nutrient solution and the sub-plots were the seven sampling dates in a 120 day period. Plant height, number of leaves, stem diameter, […]

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