Produtividade e qualidade de brócolos em função da adubação e espaçamento entre plantas

Pós-graduação em Agronomia (Produção Vegetal) - FCAV

Aspectos microbiológicos e químicos em solo submetido à solarização

Pós-graduação em Agronomia (Proteção de Plantas) - FCA

Desempenho de sementes de couve-flor em função de níveis de vigor e resposta à aplicação de nitrogênio

Pós-graduação em Agronomia - FEIS

Desempenho de híbridos experimentais de couve brócolos do tipo cabeça única em condições de verão tropical

Pós-graduação em Agronomia (Horticultura) - FCA

Estudo do lodo gerado em reator biológico, pelo tratamento da água de produção do petróleo, no terminal marítimo Almirante Barroso, município de São Sebastião, SP visando sua disposição final

Pós-graduação em Ciências Biológicas (Microbiologia Aplicada) - IBRC

Densidades populacionais e épocas de plantio na cultura da couve-flor, híbrido Verona 284

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Ozonated water and chlorine effects on the antioxidant properties of organic and conventional broccoli during postharvest

There is growing interest in studies on sanitizers other than chlorine that can maintain the quality of organic products without affecting their phytochemical content. The effects of using chlorinated and ozonized water treatments, as sanitizing procedures, on the post-harvest quality of organic and conventional broccoli (Brassica oleracea L.) cv. Italica was evaluated. The biochemical parameters (chlorophyll, polyphenols, flavonoids, vitamin C and antioxidant capacity) of the broccoli samples were analyzed at day (C) (arrival of the plant from the field, original features), and 1, 4 and 7 days after harvest. The polyamine analysis was performed on arrival of the plant from the field and on the first and seventh days. The cultivation procedure influenced polyphenol, vitamin C and total chlorophyll content, and the highest value was observed in organic broccoli after the fourth day. Flavenoid content was higher in organic broccoli. The use of ozone appears not to have had an influence on the amount of polyphenolic, flavonoids and vitamin C during storage. Total chlorophyll content was less affected by ozonized water than by the chlorine treatment as at the first and fourth days of storage. The highest content of putrescine was found in conventional broccoli, while the highest levels of spermidine and spermine were found in organic broccoli. Antioxidant capacity was highest in organic broccoli after day 4 of storage and was affected by the bioactive compounds analyzed. Methods of cultivation influenced natural antioxidant and chlorophyll contents in broccoli under cold storage.

Effect of bacillus thuringiensis on the biological parameters and phytophagy of podisus nigrispinus (hemiptera: pentatomidae)

The effect of Bacillus thuringiensis Berliner 1911 var aizawai strain GC-91 (Bta) on the biological parameters and phytophagy of Podisus nigrispinus (Dallas 1851) (Hemiptera: Pentatomidae) were evaluated using the follow treatments: a) provision of deionized water and prey Plutella xylostella (Linnaeus 1758) (Lepidoptera: Plutellidae); b) provision of only a solution containing Bta; and c) provision of prey and the solution containing Bta. To evaluate the phytophagy of the predator, leaves of Brassica oleraceae var acephala Linnaeus cv Manteiga da Georgia were provided and replaced every two days, and subsequently stained by immersion in 1% acid fuchsin. Staining enabled the visualization of the feeding sheath, which allowed for the quantification of punctures inflicted by P nigrispinus. The phytophagy, reproductive capacity and biological cycle in P nigrispinus were negatively affected by the presence of Bta; however, its predatory capacity was not altered.

Produção de repolho em função de doses e fontes de potássio em cobertura

The objective of this research was to evaluate the effects of rates and sources of potassium in top dressing on yield of cabbage hybrid Kenzan. Two experiments were conducted (15/07 to 22/11/2010 and 28/09/2010 to 27/01/2011) and nine treatments, resulted from a factorial 4 rates (45; 90; 135 and 180 kg ha(-1) of K2O) x 2 sources (KCl and K2SO4) + 1 control (without K in top dressing) were evaluated at randomized block design, with 4 replicates. After the harvest, fresh and dry weight of cabbage head and of external leaves; leaf number (from cabbage and external); diameter and height of cabbage head were evaluated. It was evaluated soil chemical characteristics at the end of first experiment and content of macro and micronutrients in plants. It was observed that potassium rates and sources did not influence most of evaluated characteristics. K content in plant increased linearly with KCl application. Results obtained show that, probably, it is not necessary application of K in top dressing when base fertilization is done with this nutrient, besides existing recommendations for this crop.

Uso de ácido ascórbico e cloreto de cálcio na qualidade de repolho minimamente processado

The objective of this trial was to evaluate the effect of ascorbic acid (AA) and calcium chloride (CaCl2) applied by immersion at temperatures of 20 and 40 degrees C on the physicochemical and sensory characteristics of minimally processed cabbage, stored under refrigeration. Cabbages were processed in an industrial food processing equipment to be cut in slices with thickness of 3 mm. Slices were immersed in sodium hypochlorite (50 ppm) during 5 minutes for sanitization. After, the following treatments were carried out T1= control (immersion in water during 5 minutes at 20 degrees C); T2= immersion in 1% AA solution, during 5 minutes at 20 degrees C; T3= immersion in 2% AA solution, during 5 minutes at 20 degrees C; T4= immersion in 1% CaCl2 solution during 5 minutes at 20 degrees C; T5= immersion in 2% CaCl2 solution during 5 minutes at 20 degrees C, T6= immersion in 1% CaCl2 solution during 5 minutes at 40 degrees C; and T7= immersion in 2% CaCl2 solution during 5 minutes at 40 degrees C; with four replications each one. After application of treatments, cabbage was centrifuged during one minute, wrapped with polyvinyl chloride, 20 mu m, in trays of expanded polystyrene and maintained in refrigerated environment, at 6 +/- 1 degrees C and 85-90% of relative humidity, during eight days. Little increasing was observed in pH and titratable acidity values and reduction in soluble solids during conservation period on all treatments. Treatment with AA did not differ from control for color and general appearance, while treatment with 2% CaCl2 at 20 degrees C maintained the best quality, with less intensity of browning, best general appearance and purchase intent and least strange odor at the end of evaluation period.

Germination, vigor and pathogen incidence in broccoli seeds treated with Carboxin + Thiram

The purpose of treating seeds chemically is to eradicate their pathogens and/or protect them against soil pathogens, mainly by germination time. However, there is little research on vegetables investigating the effect of this treatment on seed quality. Therefore, this study evaluates the effects of Carboxin + Thiram doses on germination and vigor of three lots of broccoli seeds, as well as on the incidence of fungi in treated seed. The 15 treatments were evaluated in a factorial system (3x5), with the first factor consisting of three lots of 'Avenger' broccoli seeds (lots 82744, 82745 and 82749), and the second factor consisting of five doses (0, 0.04, 0.06, 0.10 and 0.12% of a.i.) of Carboxin + Thiram fungicide (commercial name Vitavax-Thiran). The germination and seed vigor were evaluated, in addition to the presence of pathogens in seeds after treatment (blotter test). All lots showed high levels of germination and vigor. The lot 82749, however, showed higher value in plug test in substrate emergence (99%) than lot 82745 (95%). Regarding the treatment with Carboxin + Thiram, no changes in germination average (98%) and vigor were noticed (average for the first germination count, length, and dry weight of seedling, plug test at 10 days after sowing of 97%, 4.9 cm, 4.0 mg and 96%, respectively), showing that this fungicide, in the evaluated doses, does not affect the quality of broccoli seeds. As to seeds health, the pathogens Alternaria spp. and Fusarium spp. were detected, in addition to saprophytic species such as Penicillium, Aspergillus, Trichoderma, and Rhizopus. The higher incidence of Fusarium spp. was noticed in lot 82744, and the lowest in lot 82749. As to Penicillium spp., lot 82479 was the most contaminated. Regarding other fungi, the general incidence was very low and there was no difference between lots and doses used.

Entomophilous pollination in rape (Brassica napus L. var. oleifera) in Brazil

The most frequent insect visitors to the flower were: Apis mellifera, 80.6%; Trigona spinipes, 12.8% and Dialictus sp, 6.6%. -from Authors

Potencial antioxidante, óleo essencial e atividade antifúngica de plantas de jambu (Spilanthes oleracea), cultivadas sob adubação orgânica e convencional e processamento mínimo de nectarina (Prunus persica var. nectarina): conservação de suas qualidades e propriedades bioativas

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Influência da posição e da profundidade de semeadura na emergência de plântulas de açaí (Euterpe oleracea Mart. - Arecaceae)

O objetivo deste trabalho foi determinar a posição e a profundidade de semeadura mais adequadas para a emergência de plântulas de açaizeiro. As sementes foram colocadas para germinar nas profundidades de 0; 3 e 6 cm e nas seguintes posições: sementes com a rafe perpendicular à superfície do substrato e poro germinativo para cima, rafe perpendicular e poro germinativo para baixo, rafe paralela à superfície e poro germinativo para baixo e rafe paralela à superfície e poro germinativo para cima. A emergência de plântulas de açaizeiro com a rafe perpendicular à superfície do substrato e poro germinativo para cima é a mais adequada, pois proporciona igual porcentagem e menor tempo médio de emergência. Profundidades iguais ou superiores a 3 cm são inadequadas para semeadura de Euterpe oleracea Mart.