Respostas de curto período das características fotossintéticas da alga vermelha Batrachospermum delicatulum a temperatura e irradiância

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

Efeitos fisiológicos de fungicidas no desenvolvimento de plantas de melão rendilhado, cultivadas em ambiente protegido

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Efeito alelopático de extrato de leonurus sibiricus l. em mentha piperita l.. desenvolvimento, trocas gasosas e metabólitos do óleo essencial

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Fungicidas de efeitos fisiológicos no desenvolvimento de plantas de pimentão enxertadas e não enxertadas sob cultivo protegido

Pós-graduação em Agronomia (Horticultura) - FCA

Desenvolvimento, trocas gasosas, rendimento e composição de óleo essencial de Mentha piperita L. cultivada em solução nutritiva com variação dos níveis de N, P, K e Mg

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Eficiência do silicato de potássio no controle do oídio e no desenvolvimento de abobrinha de moita

The most widely standard used for powdery mildew control on cucurbitaceas is the use of resistant cultivars and systemic fungicides, even though nutrition has been an option. The supply of silicon is benefic to many vegetable species, stimulating growth, yield, photosynthesis and regulation of transpiration; besides, its deposition in the epidermis avoids the invasion of fungus, bacteria and sucking insects. The aim of this experiment was to evaluate the influence of potassium silicate on powdery mildew control, development and yield of zucchini squash, cultivar Caserta. The experiment was conducted at Universidade Estadual Paulista, in greenhouse conditions and with a randomized design, divided in four replications, 11 plants per plot and five treatments: control (water), chemical treatment with fenarimol (2.4 g a.i. 100 L-1) and potassium silicate, in doses 1.5 L ha-1; 2.0 L ha-1 and 2.5 L ha-1. We evaluated the disease severity; gas exchange (net CO2 assimilation rates, transpiration, stomatal conductance and water use efficiency); growth (leaf area ratio, relative growth rate, absolute growth rate, net assimilation rate and specific leaf mass) and yield. The results showed that the foliar application of potassium silicate and fenarimol controlled powdery mildew and had no influence on plant growth. Therefore, the potassium silicate may be used as alternative for control of fungal pathogens and reduced application of chemical products, which provides a greater environmental sustainability. However, it is necessary to be careful with high doses because it was observed that 2.5 L h-1 was harmful to fruit production and gas exchange, despite being effective in controlling powdery mildew. According to this study it is recommended using 2.0 L ha-1 for control of powdery mildew to zucchini squash, and can replace the use of fenarimol, without affecting productivity and development of plants.

Copper oxychloride fungicide and its effect on growth and oxidative stress of potato plants

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Aplicação de extratos de algas marinhas em cafeeiro sob deficiência hídrica e estresse salino

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

Leaf gas exchange and yield of three upland rice cultivars

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

Desenvolvimento inicial de clones IAC de seringueira em São José do Rio Preto, SP

In this study the development of four clones (IAC 35; 40; 300 e 301) of rubber tree [Hevea brasiliensis (Willd. ex A. Juss.) Müell. Arg.] selected by Instituto Agronômico de Campinas were evaluated during the first 24 months of cultivation. The experiment was laid out in randomized block design with three replications and four plants for parcel following the 1.5mx1.0m spacing at São José do Rio Preto, SP. The clone RRIM 600 was used as check. The variables analyzed were the trunk girth, the number of matured whorl, the photosynthesis rate and the concentrations of chlorophyll a, b, total and carotenoids. At the end of the experiment the values of trunk girth at 0.5m above the budgrafting union varied from 5.85 cm (IAC 301) to 10.53 cm (IAC 300) and the mean number of matured whorl varied from 2.58 (IAC 301) to 3.91 (RRIM 600). During the dry season, when the plants were 22 month old, the mean value of photosynthesis rate of IAC 40 and IAC 301 (12mol m-2 s-1) were lower compared to the other clones (15mol m-2 s-1). The chlorophyll a, b and total carotenoids concentrations were equal or superior to the check, never lower. Considering the variables analyzed, excluding the IAC 301, the other clones show performance comparable to RRIM 600.

Growth and nutritional disorders of eggplant cultivated in nutrients solutions with suppressed macronutrients

The objective was to evaluate the effects of omitting macronutrients in the nutrients solution on growth characteristics and nutritional status of eggplants. The treatments were complete nutrients solution and solutions with nutrient omission: nitrogen (N), phosphorus (P), potassium (K), calcium (Ca), magnesium (Mg), and sulfur (S). The experiment was carried out under greenhouse conditions with three replicates in a completely random design. Plant height, number of leaves per plant, leaf area, relative chlorophyll index, photosynthesis rate, stomatal conductance, dry matter, concentration levels of macronutrients in plant aerial part and root system, and nutritional disorders were evaluated. Omitting elements interfered in the concentration of elements in the various plant tissues and this had as consequences limited vegetative growth, reduced dry matter and led to the development of the typical deficiency symptoms of each element. Although potassium was the most demanded of all elements, nitrogen and calcium were the most growth limiting ones.

Cotton yield and fiber quality affected by row spacing and shading at different growth stages

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Influência do glyphosate no perfil bioquímico e fisiológico de populações de azevém (Lolium multiflorum) suscetíveis e resistentes ao herbicida

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Cultivo de Eucalyptus urograndis em atmosfera enriquecida com CO2: mudanças no proteoma cloroplastidial

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

Efeito da luz no crescimento de mudas de Hymenaea parvifolia Huber

Este trabalho teve como objetivo determinar o efeito da intensidade de luz no crescimento de mudas de Hymenaea parvifolia Huber., bem como inferir sobre o seu grau de tolerância à sombra. Para tal, foi instalado um experimento em delineamento inteiramente casualizado, com quatro tratamentos (níveis de luz): pleno sol (PS), 50% de sombreamento, 70% de sombreamento e sombreamento natural (SN). Os níveis de 50 e 70% de sombreamento foram obtidos com o uso de telas de polipropileno preto, e o sombreamento natural constituiu a luminosidade natural sob um dossel fechado de floresta. Cada tratamento foi constituído de 10 repetições. Plantas sob sombreamento (50% e 70% de sombreamento) apresentaram maior altura, área foliar e razão de área foliar e poucas diferenças no acúmulo de massa seca quando comparadas com plantas mantidas a pleno sol. Como conseqüência, poucas diferenças foram observadas na taxa de crescimento relativo das mudas desses tratamentos. Todavia, mudas mantidas sob sombreamento natural foram as que exibiram menor taxa de crescimento relativo e taxa assimilatória líquida. em conjunto, os resultados indicaram que Hymenaea parvifolia foi capaz de se ajustar para maximizar a aquisição de luz mesmo em condição muito limitante, como a proporcionada pelo sombreamento natural, e a produção de mudas dessa espécie vegetal pode ser realizada em viveiro desde a pleno sol, como a 50% ou 70% de sombreamento.