Adubação de cultivares de feijoeiro comum em várzeas tropicais

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Desenvolvimento de mudas de Tabeluia chrysotricha em função de substratos e de soluções de fertirrigação

The work aimed to study the development of Tabebuia chrysotricha Standl. seedlings injunction of different substrate and different fertilization solutions. To compose the substrate it was used fibrous and granulated coconut fiber obtaining the following treatments: S1- 100% fibrous, S2- 60% fibrous and 40% granulated, S3- 40% fibrous and 60% granulated and S4- 100% granulated. The basis fertilization was the same for all treatments and the solutions of fertilization varied in order to obtain solutions with the following electric conductivities: EC1- 1.06 dS m(-1), EC2- 2.12 dS m(-1), EC3- 3.2 dS m(-1) and EC4- 4.25 dS m(-1). The propagative material was sowed directly in plastic containers (120mL) with the respective substrates. The fertilization was received through sub irrigation once a week, until the seedlings reached 20cm of height approximately. The chemical analyses of the substrate (EC and pH), through aqueous extraction method 1:1.5 (1 substrate: 1.5 deionized water), the analyses of aerial part height, stein diameter and pairs true leaves number, as well as the weight of total dry, matter, were accomplished each 15 days. In almost every analysis, the substrate with granulated coconut fiber, as well as the smallest EC (1.06 e 2.12 dS m(-1)) of fertilization solutions,formed seedlings with higher averages, indicating faster growth. In the conditions of this experiment, the production of T. chrysotricha seedlings was better in granulated coconut fiber substrate and fertilizer solutions with EC of 1.06 dS m(-1), appreciating the estimated characteristics.

Composição química e aspectos morfológicos de mudas de Tabebuia chrysotricha (Standl.) produzidas em diferentes substratos e soluções de fertirrigação

The work aimed to study the formation of Tabebuia chrysotricha Standl. seedlings in function of four substrates, varying the covering fertilization solutions. To compose the substrate it was used fibrous and granulated coconut fiber obtaining the following treatments: 100% fibrous (100% F), 60% fibrous + 40% granulated (60% F+40% G), 40% fibrous + 60% granulated (40% F+60% G) and 100% granulated (100% G). The basis fertilization was the same for all treatments and the solutions of covering fertilization varied in order to obtain complete solutions with electric conductivities of 1.06 dS m(-1), 2.12 dS m(-1), 3.2 dS m(-1) and 4.25 dS m(-1). The propagative material was sowed directly in plastic containers (120mL) with the respective substrates. The fertilization was received through sub-irrigation once a week, respecting the treatments of fertilizations. Seedlings produced in 100%G had been taller and higher than the others. The chemical analyses of aerial part were obtained when the seedlings were ready for expedition (height of 20 cm). The seedlings production in substrate 100% F and 60% F+40% G allowed them to have higher N, S, B, Mn and Zn concentrations in the aerial part. The production of T chrysotricha seedlings is recommended in granulated coconut fiber substrate and fertilizer solutions with EC of 1.06 dS m(-1)

Características biométricas de mudas de Tabebula chrysotricha(standl.) formadas em diferentes substratos e soluções de fertirrigação, quando plantadas em campo

Este trabalho objetivou estudar as características biométricas de plantas de ipê-amarelo (Tabebuia chrysotricha Standl.) formadas, na fase de viveiro, em função de quatro substratos, variando as soluções de fertirrigação. Para compor os substratos, foram utilizadas fibras de coco fibrosa e granulada, formando os tratamentos 100% fibrosa, 60% fibrosa e 40% granulada, 40% fibrosa e 60% granulada e 100% granulada. A adubação de base foi igual em todos os tratamentos, e as soluções de adubação variaram, a fim de se obterem soluções completas com condutividades elétricas de 1,06 dS m-1; 2,12 dS m-1; 3,2 dS m-1; e 4,24 dS m¹. As sementes foram colocadas diretamente nos tubetes (120 mL) contendo os respectivos substratos e receberam as fertirrigações por subsuperfície uma vez por semana, respeitando-se os tratamentos de adubação. Quando as mudas atingiram aproximadamente 20 cm de altura, elas foram realocadas sob tela de 9% de sombreamento, onde permaneceram até o plantio, em Taubaté, SP. Mudas produzidas em fibra de coco 100% granulada alcançaram, em campo, maiores alturas, diâmetros de coleto e número de folhas. Apesar das diferentes soluções de fertirrigação aplicadas, as alturas de parte aérea se igualaram a partir dos 167 dias após o plantio em campo. Recomendase a produção de mudas de ipê-amarelo (T. chrysotricha) em substratos contendo fibra de coco granulada e soluções de fertirrigação com condutividade elétrica de 1,06 dS m-1.

Composição química e aspectos morfológicos de mudas de Tabebuia chrysotricha (Standl.) produzidas em diferentes substratos e soluções de fertirrigação

The work aimed to study the formation of Tabebuia chrysotricha Standi, seedlings in function of four substrates, varying the covering fertilization solutions. To compose the substrate it was used fibrous and granulated coconut fiber obtaining the following treatments: 100% fibrous (100% F), 60% fibrous + 40% granulated (60% F+40% G), 40% fibrous + 60% granulated (40% F+60% G) and 100% granulated (100% G). The basis fertilization was the same for all treatments and the solutions of covering fertilization varied in order to obtain complete solutions with electric conductivities of 1.06 dS m-1, 2.12 dS m-1, 3.2 dS m-1 and 4.25 dS m-1. The propagative material was sowed directly in plastic containers (120mL) with the respective substrates. The fertilization was received through sub-irrigation once a week, respecting the treatments of fertilizations. Seedlings produced in 100%G had been taller and higher than the others. The chemical analyses of aerial part were obtained when the seedlings were ready for expedition (height of 20 cm). The seedlings production in substrate 100% F and 60% F+40% G allowed them to have higher N, S, B, Mn and Zn concentrations in the aerial part. The production of T. chrysotricha seedlings is recommended in granulated coconut fiber substrate and fertilizer solutions with EC of 1.06 dS m-1.

Desenvolvimento de plantas de sorgo submetidas a diferentes níveis de lençol freático

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Produção de mudas de ipê amarelo (Tabebuia chrysotricha Standl.) em função de substratos e de soluções de fertirrigação

Pós-graduação em Agronomia (Horticultura) - FCA

Estimativa da umidade de um solo de várzea sob duas condições de drenagem e subirrigação

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

The Influence of Municipal Treated Wastewater on Morpho-Physiological Characteristics of Eucalyptus Plants

The effects of municipal-treated wastewater on growth and gas exchange characteristics were studied in eucalyptus plants cultivated in a greenhouse under continuous sub irrigation with 70 % Long Ashton solution as a control, 100 % treated wastewater, and treated wastewater diluted 50 % with tap water. Irrigation with wastewater resulted in a reduction of total dry matter per plant and the shoot-to-root ratio and increased specific leaf mass, irrespective of the dilution. The gas exchange characteristics were adversely affected by the irrigation with wastewater, with photosynthetic rates been negatively affected. Total chlorophyll and carotenoids content were reduced in plants grown under treated wastewater. The results demonstrated that when the eucalyptus plants were grown under treated wastewater as the only source of mineral nutrients they were able to produce nearly 50 % of the dry matter produced by the plants grown under appropriate mineral nutrient supply, irrespective of the dilution. Therefore, the contribution of mineral nutrients and organic matter from the treated wastewater used as agricultural irrigation will be significant in lower the fertilizer rates without reducing dry matter production per plant.

Dry matter yield and nutritional value of Marandu grass under nitrogen fertilization and irrigation in cerrado in São Paulo

The aim of this study was to evaluate dry matter yield and nutritional value of palisade grass (Brachiaria brizantha cv. Marandu) using nitrogen doses and sprinkler irrigation in two periods of the year, aiming at reducing seasonality of forage production. It was used a randomized block design in a split-plot scheme, with five doses of nitrogen (0, 50, 100, 150, and 200 kg/ha/cut), and the sub-plots were defined by the seasons of the year (wet and dry season), with and without irrigation. During the wet season, in the plots with and without irrigation, doses of 175 and 161 kg/ha/cut promoted the highest dry matter yields. During the dry season, 171 kg ha -1N with irrigation resulted in the highest dry matter yield. During the same season, there was no response to N fertilization in the lack of irrigation. Average contents of CP were 10% with and without irrigation. Contents of neutral detergent fiber decreased with nitrogen doses, while acid detergent fiber was not affected by fertilization. Plots under irrigation reached the maximal acid detergent fiber content at N dose of 60 kg ha -1. Irrigation promotes increase of 15% increase in dry matter yield and it increases contents of neutral detergent fiber. © 2010 Sociedade Brasileira de Zootecnia.

Proposta de um sistema automatizado para controle de nível freático em sub-irrigação

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

Geotecnologias na delimitação de áreas prioritárias à recomposição florestal na sub-bacia do Ribeirão Lavapés, Botucatu-SP

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

Mapeamento do Uso do Solo Nas Sub-bacias dos Córregos São José e Água do Ventura, Bauru (SP)

O presente trabalho teve como objetivo, mapear o uso da terra das sub-bacias dos córregos São José e Água do Ventura no ano 2000, e verificar, como esta ocupação vem atuando nos processos de assoreamento dos corpos de água. O estudo teve como base, um mosaico em escala nominal aproximada de 1:10.000, produzido a partir de fotografias aéreas verticais do ano 2000, em escala nominal aproximada 1:30.000. Os resultados permitiram constatar que a pastagem foi a maior ocupação do solo, com 430,89 ha, correspondente a 65,21% da área estudada. Devido ao manejo inadequado do solo, é a cobertura vegetal que mais produz sedimentos por ocasião das chuvas, merecendo cuidados especiais para evitar os processos erosivos do solo. Foi constatado também, que os serviços de adequação e melhoria de estradas rurais, executados nas estradas municipais BRU-030 (antiga Bauru/Piratininga) e variante da BRU-030, atingiram seus objetivos, pois, praticamente, acabaram com a erosão das estradas, permitindo tráfego o ano inteiro, reduzindo o custo de manutenção das estradas e aumentando o abastecimento do lençol freático, além de outros benefícios.

Balanço hídrico na sub-bacia hidrográfica do Boi Branco – SP para gestão sustentável da agricultura irrigada

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

Modelagem dinâmica temporal para a avaliação da disponibilidade hídrica e seus efeitos na sustentabilidade do sistema da sub-bacia do córrego do Boi Branco - SP

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