Diovany Doffinger Ramos

Atividade antioxidante de Hibiscus sabdariffa L. em função do espaçamento entre plantas e da adubação orgânica

The purpose of this paper was to analyze the effects of plant spacing within rows by means of applying or not applying chicken-manure to the soil cover in the antioxidant activity, total phenolic and flavonoids in ethanolic leaves extract and hot aqueous extract of roselle. The treatments consisted of five different spaces between plants (0.30, 0.35, 0.40, 0.45 and 0.50m) and the use or non-use of chicken litter broadcasted on soil surface at 10 ton ha-1, in a 5x2 factorial arrangement in a randomized block design with four replications. The flavonoids levels and total phenolic increased on ethanolic leaves extract (18% and 11%, respectively) and hot aqueous extract (16% and 11%, respectively) between applying or not applying chicken-manure to the soil cover. Antioxidant activity was significantly influenced by the way of obtaining extracts, being the ethanolic extract 263% higher than the results obtained by the hot aqueous extract.

Estudo nutricional da canafístula (II): eficiência nutricional em função da adubação com nitrogênio e fósforo

The objective of this study was to evaluate the effect of combined levels of N and P in nutrient content and nutritional efficiency in seedlings of canafistula (Peltophorum dubium Spreng. Taub.) on Oxisol. The experiment was carried out in pots of 4 dm 3 , with treatments arranged in 4x4 factorial scheme, four N levels (0, 20.82, 41.64 and 62.46 mg kg -1 N) and four P levels ( 0, 41.72, 83.72 and 125.16 mg kg -1 of P 2 O 5 in a randomized block design with three replications. The highest levels of N and P showed higher accumulation of nutrients in both the shoot and root while for the micronutrients that effect was caused only by P. The species showed high nutritional requirement for N, P used more efficiently and supply of nutrients is greater for shoot seedling.

Estudo nutricional da canafístula (I): crescimento e qualidade de mudas em resposta à adubação com nitrogênio e fósforo

Canafistula is an important native forest species, found in Cerrado, which still lacks on nutritional information and obtaining quality seedlings. Therefore, this study aimed to evaluate the effects of the addition of nitrogen and phosphorus on initial growth and seedling quality of canafistula (Peltophorum dubium Spreng. Taub.) grown in Oxisol. The experiment was carried out in 4 dm 3 pots with treatments arranged in 4x4 factorial scheme, with four N levels (0, 20.82, 41.64 and 62.46 mg kg -1 N) and four P levels (0, 41.72, 83.72 and 125.16 mg kg -1 of P 2 O 5 ) in a randomized block design with three replications. Were evaluated the growth characteristics (height, stem diameter and dry mass of shoots and roots) and quality parameters of seedlings (ratio height/diameter RAD; ratio dry mass of shoot / root dry weight RPAR, and Dickson Index). There was significant interaction between N and P for all growth characters and quality parameters evaluated. The highest level of N and P showed higher growth of seedlings. However, regarding the quality of seedlings, the Dickson index indicated that the phosphorous is the most important element.

EFICIÊNCIA NUTRICIONAL DE MUDAS DE Stryphnodendron polyphyllum EM FUNÇÃO DE NITROGÊNIO E FÓSFORO

Devido a carencia de estudos agronomicos com especies nativas e da importância do adequado fornecimento de nutrientes as plantas, objetivou-se neste trabalho avaliar o efeito de doses de N e P sobre o teor e conteudo de nutrientes, bem como na eficiencia nutricional de mudas de barbatimao (Stryphnodendron polyphyllum), em Latossolo Vermelho distroferrico. O trabalho foi desenvolvido em vasos de 8 dm3 , mantidos em casa de vegetacao. Foram estudadas quatro doses de N (0; 20,82; 41,64 e 62,46 mg kg-1 de N) e quatro doses de P (0; 41,72; 83,44 e 125,16 mg kg-1 de P2O5), em esquema fatorial 4 x 4, no delineamento experimental de blocos casualizados, com quatro repeticoes. Decorridos 210 dias apos a semeadura avaliou-se massa seca da parte aerea e radicular e teor de macro e micronutrientes na planta; por meio desses dados foram calculados os indices de eficiencia de absorcao e utilizacao de nutrientes. Houve interacao significativa entre as doses de N e P para os teores de P, K, Ca, Cu, Mn e Zn na parte aerea e N, P, K, Ca, Mg e Fe na raiz. Na parte aerea das mudas, os nutrientes N e Fe foram influenciados somente pelo efeito isolado das doses de N, e o teor de Mg pelo efeito isolado das doses de P. O conteudo de todos os nutrientes, na parte aerea e na raiz, foi influenciado significativamente pela interacao entre as doses de N e P. As maximas doses proporcionaram maior conteudo de macronutrientes na parte aerea, exceto N e K. O conteudo de micronutrientes na parte aerea aumentou em funcao das doses de N e P e reduziu na raiz, exceto Fe. As mudas de barbatimao mostraram-se mais eficientes em absorver N e Zn e utilizar P e Mg. Comparados ao conteudo, o N e o Ca foram os nutrientes mais acumulados nos tecidos da planta, contudo, os que apresentaram menor valor (P e Mg) foram os nutrientes mais eficientemente utilizados.

Crescimento inicial de Stryphnodendron polyphylum (Mart.) em resposta à adubação com N e P

Barbatimao is an important native specie of Savannah, with economic potential and restoration of degraded areas, however, there are few agronomic studies with the specie, particularly regarding the fertilization with nitrogen and phosphorus in Cerrado soils. Thus, the objective was to study the initial growth, the levels of chlorophyll, dry matter production in function of N and P levels. The study was developed in 8 dm 3 pots and kept in a greenhouse. There were studied four N levels (0, 20.82, 41.64 and 62.46 mg N kg -1 ) and four P levels (0, 41.72, 83.44 and 125.16 mg.kg -1 P 2 O 5 ) in 4x4 factorial design in randomized blocks experimental design with four replications. After 210 days after sowing height, stem diameter, chlorophyll content, dry mass of shoot and root and leaf N content were measured. The nitrogen and phosphate application showed higher increment for all traits.

Produção da fáfia [Pfaffia glomerata (Spreng.) Pedersen] com cama-de-frango e fósforo incorporados ao solo

The aimed of this study was to evaluate the effect of of chicken manure and phosphorus incorporated to the soil on growth and yield of fafia. Treatments were five doses of chicken manure (0, 5, 10, 15 and 20 t ha-1), with and without the use of phosphorus (200 kg ha-1 of P2O5, in triple superphosphate form), arranged in 5 x 2 factorial scheme in randomized block design with four replications. Plant heights varied as a function of chicken manure doses, which the highest (138.50 cm) under 20 t ha-1. Yields of fresh and dried weight of leaves, stems and roots were influenced significantly by the interaction chicken manure x phosphorus. The highest yields of fresh and dried leaves (597 kg ha-1 and 100 kg ha-1, respectively) were obtained with the dose of 20 t ha-1 of chicken manure, without the use of phosphorus. For stems, the highest yields of fresh and dried weight (7.757 kg ha-1 and 2.633 kg ha-1, respectively) were obtained with the dose of 20 t ha-1 of chicken manure, with the use of phosphorus. The highest yields of fresh and dried weight of roots (9.065 kg ha-1 and 377 kg ha-1, respectively) were obtained with the dose of 20 t ha-1 of chicken manure, without the use of phosphorus. Average contents of N, P and K of leaves were 8.60; 0.88 and 4.46 g kg-1, respectively. Contents of Ca and Mg were maximum (7.56 and 5.12 g kg-1, respectively) with the use of 20 t ha-1 of chicken manure, independent on the use of phosphorus. In roots, average contents of N, P and Mg were 2.74, 0.27 and 0.96 g kg-1, respectively. K content reduced linearly with chicken manure doses and of Ca was maximum with the use of 20 t ha-1. For obtaining the highest yields of fresh and dried weight of leaves and roots, the fafia plants must be grown with chicken manure (20 t ha-1) incorporated to the soil within the use of phosphorus.