Efeito do desbaste seletivo sobre a divergência genética em progênies de Pinus caribaea Morelet var. bahamensis

The objective of this work was to study the effect of selective thinning on! the genetic divergence in progenies of Pinus caribaea var. bahamensis, aiming to identify the most productive and divergent progenies for the use of improvement program. The test of progenies containing 119 progenies and two commercial controls were planted in March 1990, using 11 x 11 square lattice design, sextuple, partially balanced, disposed in lineal plots with six trees in the spacing of 3,0 x 3,0m. 13 years after planting thinning was realized (selection for DBH), with 50% selection intensity based on Multi-effect index, leaving three trees per plot in all the experiment. The evaluations were done at four situations: A (before the thinning); B (thinned trees); C (remaining trees after thinning) and D (one year after thinning). The analyzed traits were: height, diameter at breast height (DBH), volume, form of stem and wood density. The genetic divergence among the progenies was studied with aid of the canonical variables and of clustering of Tocher method using the generalized distance matrix of Mahalanobis (D(2)) as estimate of the genetic similarity. The progenies were grouped in four groups in situation A, fourteen in the situation B, two in the situation C and three in the situation D. The selective thinning of the trees within of the progenies caused a change in the genetic divergence among the progenies, genetically homogenizing the progenies, as demonstrated by the generalized distances of Mahalanobis, clustering of Tocher' and canonical variables methods; The. thinning made possible a high uniformity in respect to the relative contribution, of the traits for the total genetic divergence. The techniques, of clustering were efficient to identify groups of divergent,progenies for the use hybridization and little divergent progenies for the use in backcross program.

Visible and near-infrared luminescent Eu3+ or Er3+ doped laponite-derived xerogels and thick films: Structural and spectroscopic properties

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Distribuição volumétrica e espectro de gotas de bicos hidráulicos de jato plano de faixa expandida XR11003

O presente trabalho teve por objetivos avaliar o espectro de gotas e os perfis de distribuição volumétrica de um bico hidráulico de jato plano de faixa expandida, modelo XR11003. Utilizou-se de analisador de partículas a laser para avaliar o espectro de gotas e de mesa de deposição para análise da distribuição volumétrica. O ensaio do espectro de gotas foi em delineamento inteiramente casualizado, em esquema fatorial 2 x 2 x 3, com três repetições, em que o primeiro fator representa o líquido pulverizado (L1 = água e L2 = água + 0,1% de espalhante adesivo não-iônico), o segundo representa a pressão de pulverização (P1 = 200 kPa e P2 = 400 kPa) e o terceiro representa três bicos hidráulicos XR11003 de jato plano (B1, B2 e B3). No ensaio de distribuição volumétrica, o delineamento foi o inteiramente casualizado, em esquema fatorial com dois fatores, não se avaliando o fator bico. Dos resultados do espectro de gotas, observaram-se maior tamanho de gotas para a pressão de 200 kPa e menor amplitude relativa quando se utilizou 0,1% de adjuvante. Para os perfis de distribuição volumétrica, ocorreu aumento na faixa de deposição e no espaçamento entre bicos com C.V. de 10%, com a adição de 0,1% de adjuvante e aumento na pressão.

Efeito do desbaste seletivo sobre a divergência genética em progênies de Pinus caribaea Morelet var. bahamensis

The objective of this work was to study the effect of selective thinning on the genetic divergence in progenies of Pinus caribaea var. bahamensis, aiming to identify the most productive and divergent progenies for the use of improvement program. The test of progenies containing 119 progenies and two commercial controls were planted in March 1990, using 11 × 11 square lattice design, sextuple, partially balanced, disposed in lineal plots with six trees in the spacing of 3,0 × 3,0m. 13 years after planting thinning was realized (selection for DBH), with 50% selection intensity based on Multi-effect index, leaving three trees per plot in all the experiment. The evaluations were done at four situations: A (before the thinning); B (thinned trees); C (remaining trees after thinning) and D (one year after thinning). The analyzed traits were: height, diameter at breast height (DBH), volume, form of stem and wood density. The genetic divergence among the progenies was studied with aid of the canonical variables and of clustering of Tocher method, using the generalized distance matrix of Mahalanobis (D2) as estimate of the genetic similarity. The progenies were grouped in four groups in situation A, fourteen in the situation B, two in the situation C and three in the situation D. The selective thinning of the trees within of the progenies caused a change in the genetic divergence among the progenies, genetically homogenizing the progenies, as demonstrated by the generalized distances of Mahalanobis, clustering of Tocher' and canonical variables methods. The thinning made possible a high uniformity in respect to the relative contribution of the traits for the total genetic divergence. The techniques of clustering were efficient to identify groups of divergent progenies for the use hybridization and little divergent progenies for the use in backcross program.

Massa seca e composição bromatológica de quatro espécies de braquiárias semeadas na linha ou a lanço, em consórcio com milho no sistema plantio direto na palha

The objective of this research was to evaluate the dry mass yield and chemical composition of four Brachiaria species in different options for sowing, exclusively or in intercrop with corn crop, under a no-tillage system. The experiment was carried out during the growing seasons of 2006 at FEPE (FE/Unesp, Ilha Solteira Campus) located in Selvíria, Mato Grosso do Sul State, Brazil. The soil of the experimental area was classified as distroferric Red Latosol (Oxisol). The experimental design was in randomized blocks, in a factorial scheme (4 × 4), with five replications. The treatments consisted of four Brachiaria species (Brachiaria brizantha cv. Marandu, Brachiaria decumbens, Brachiaria ruziziensis and Mulato II grass) grown in rows and spread on total area, exclusively or intercropped simultaneously with corn crop sowing. The study evaluated the dry mass yield and total digestible nutrients, crude protein, ash, neutral detergent fiber, acid detergent fiber, hemicelluloses, cellulose and lignin content of forage. The spread on total area intercrop of forages with corn crop proved to be viable by presenting similar dry mass yield to exclusive sowing arrangements, conversely to what happened with intercrop in row of corn crop, which decreased such yield. Brachiaria ruziziensis showed superior chemical composition and the intercrops increased energy and crude protein contents, and decreased cell wall components.

Crescimento e acúmulo de nutrientes da cultura do quiabeiro

With the objective to quantify the okra crop's growth and macro and micronutrients accumulation during its life-cycle obtaining equations that best represent it, an experiment was carried out at Jaboticabal city, SP, Brazil, from January 14th to May 14th, 2009. The cv. Santa Cruz 47 was directly sowed into open soil furrows, in a spacing of 1 x 0,2 m. During the life-cycle were realized random samples of plants at 15 days intervals. The means were adjusted to polynomial regression equations set of non-linear parameters. After 50 days from sowing there has been a large increase of dry matter in plant' parts. At the final harvest, 120 days after sowing, the leaves, stems and fruits accounted for 21, 71 and 8%, respectively, from the total plant dry matter. The decreasing sequence of nutrient accumulation was K, Ca, N, Mg, P, Fe, B, Mn, Zn and Cu equivalent to 6,002.8; 4,733.8; 2,930.8; 1,196.3; 473.7; 436.2; 49.8; 10.4; 7.1; 7.1 e 1.5 mg plant-1. The quantity accumulated of culture were 146.5; 23.7; 300.1; 236.7; 59.8 e 21.8 kg ha-1 of N, P, K, Ca, Mg and S, respectively, and 520.0; 76.0; 2,491.0; 355.0 e 355.0 de B, Cu, Fe, Mn and Zn, respectively.

Resposta do feijoeiro (Phaseolus vulgaris L.) à adubação nitrogenada de cobertura em dois sistemas de manejo de solo

Pós-graduação em Agronomia (Agricultura) - FCA

Emissão de CO2 do solo associado à calagem em área de conversão de laranja para cana-de-açúcar

Pós-graduação em Agronomia (Ciência do Solo) - FCAV

Mecanismos sulcadores de semeadora-adubadora na cultura do milho (Zea mays L.) no sistema de plantio direto

Pós-graduação em Agronomia (Energia na Agricultura) - FCA

Dessalinização do solo provocada pelo excesso do íon potássio em latossolo vermelho amarelo cultivado com alface americana (Lactuca sativa L.) irrigada sob ambiente protegido

Pós-graduação em Agronomia (Irrigação e Drenagem) - FCA

Crescimento e acúmulo de nutrientes em quiabeiro ‘Santa Cruz 47'

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Análise de crescimento e marcha de acúmulo de nutrientes na cultura do pimentão, cultivado em substrato

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Híbridos de tomate industrial cultivados em ambiente protegido e campo, visando produção de frutos para mesa

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Avaliação de recipientes com substrato de fibra de coco no cultivo de híbridos de melão rendilhado sob ambiente protegido

Pós-graduação em Agronomia - FEIS

Interferência da comunidade de plantas daninhas na cultura da soja em função do espaçamento de semeadura

Pós-graduação em Agronomia (Agricultura) - FCA