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Registros recuperados: 3
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Effect of polymers associated with N and K fertilizer sources on Dendrathema grandiflorum growth and K, Ca and Mg relations BABT
Regiane Cristina Marcato,Sita; Reissmann,Carlos Bruno; Marques,Renato; Oliveira,Edilson de; Taffarel,Angela Daniela.
This study was conducted to evaluate the effect of polymer used with different nitrogen and potassium sources on the growth and nutrition of chrysanthemum (Dendranthema grandiforum, var. "Virginal") and on chemical characteristics of substrate. Two substrates were evaluated: 1) composite with 50 % organic soil, 45 % sand, and 5 % composted tobacco; 2) plow layer soil (0-20 cm depth; red oxisol typical dystrophic). The experimental design was a factorial (4x2x2) and included four polymer rates (0, 1, 2, and 4 g kg-1of substrate), two nitrogen ((NH4)2SO4 and (H2N)2CO), and two potassium (KCl and K2SO4) sources. Dry biomass, flower number, and concentration of K, Ca, and Mg were evaluated. Inverse relationships between polymer rates and plant biomass,...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Hydrogel; Polyacrylamide; Chrysanthemum; Fertilizer; Macronutrients.
Ano: 2005 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132005000300002
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Forest structure and species composition along a successional gradient of Lowland Atlantic Forest in Southern Brazil Biota Neotropica
Marques,Márcia C.M.; Zwiener,Victor P.; Ramos,Fernando M.; Borgo,Marília; Marques,Renato.
The Lowland Forest is one of the most disturbed and fragile ecosystems in the Atlantic Forest biome, yet little is known regarding its successional trajectory and resilience. We evaluated changes in species assemblages and forest structure of the canopy and understory along a successional gradient (young 21-yrs old forest, immature 34-yrs old forest and late successional 59-yrs old forest) aiming to assess changes in species composition and successional trajectory of different strata of secondary forests. A 0.1 ha plot (ten 10x10 m sub-plots) from each forest stand was surveyed for trees and shrubs with a diameter at breast height (DBH) ≥ 4.8 cm (canopy) and for individuals with heights ≥ 1 m and DBH < 4.8 cm (understory). A total of 3,619 individuals...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Canopy; Chronosequence; Restinga; Understory.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032014000300118
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Nutrient composition of mature and litter leaves and nutrient mobilization in leaves of tree species from secondary rainforests in the South of Brazil BABT
Dickow,Kauana Melissa Cunha; Marques,Renato; Pinto,Carolina Benghi.
The aim of this work was to analyze the concentration of N, P, K, Ca and Mg in mature and litter leaves and nutrient mobilization in leaves of different tree species from secondary forests of the Atlantic Forest. At the study site, located in Floresta do Palmito (Paranaguá, PR), three different forest typologies namely Initial, Intermediary and Advanced were selected. The predominant sequence of nutrients in litter leaves was: N > Ca > Mg > K > P. This sequence was very similar to that found for mature leaves, the difference being only the change in order between Mg and K. Nutrients mobilized in leaves were higher in the typology Advanced compared to the typology Initial, mainly N, P and K. The majority of the species studied did not mobilize...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Atlantic forest; Biogeochemical cycling; Forest nutrition; Brazil.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132009000500006
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