Atelene Normann Kampf

Acúmulo de macronutrientes em plantas de crisântemo sob cultivo hidropônico em argila expandida para flor-de-corte

The experiments were conducted in fall/winter and spring/summer seasons, respectively, using expanded clay (grain sizes 4-10, 4-13, 10-13, 13-20 mm) saturated twice or three times a day with nutrient solution N-P-K (1-0.3-2.5) plus conventional production system. The plants grown in expanded clay in fall/winter seasons had dry matter production and N-P-K content significantly higher than those grown in conventional production system. These characteristics improved when planting occurred at the three smallest expanded clay grain sizes and saturation with nutrient solution was done twice a day. The plants grown in expanded clay in the spring/summer season had dry matter production and N-P-K and Ca contents similar to those grown in conventional production system. These characteristics were not affected by frequency of saturation with nutrient solution and expanded clay grain size. Factors, as planting season, temperature and moisture may have limited absorption of nutrients by the plants grown in hardened expanded clay. All treatments showed adequate levels of macronutrients in upper leaves.

In vitro propagation of Limonium latifolium Kuntze (Plümbaginaceae)

Limonium latifolium Kuntze is a cut flower commercialy propagated in vitro. To develop and improve the micropropagation protocol, a sequence of assays was developed to evaluate performance of node explants; effect of cytokinins concentration (kinetin-KlN and 6-benzyl-aminopurin-BA) on the regeneration rate; the presence of BA during the multiplication phase; concentration of naphthaleneacetic acid-NAA and indole3-butyric acid-IBA on the rooting phase and procederes for the acciimatiwtion in vitro. The micropropagation was done at commercial levei using inflorescence nades explants. By the regeneration phase the best results were obtained with BA at 0.7mg/l for 35 days in MS medium. The multiplication phase takes 35 days and shows satisfactory results with BA at 0.2mg/l , with the rate of 4 plantiets/explant. The rooting phase is takes 30 days in MS medium with IBA at 1mg/l , with good survival scores after transfer to in vivo. The acciimatiwtion has made under plastic covering, inside greenhouse with room temperature and intermitent mist, using flats with 242 cells of 10cm3 each, filled with sterilized carbonized rice hulis. Every two weeks the plants were fertigated with commercial fertilizer (15:5:15 + micronutrients) at 0.5g/l . The in vitro process takes 100 - 120 days and one explant originates 15 - 30 plants.

IMPEDÂNCIA MECÂNICA EM SUBSTRATOS HORTÍCOLAS

The penetration power of the roots into the soil has been studied in relation to field crops but not to container media. In this work the mechanical impedance of sand, perlite, peat, coir and commercial mixtures were evaluated: Fafard, no 2, Fafard 2P, Jiffy 7 and Oasis. Dry and saturated samples were analyzed under four levels of compactation. Jiffy 7 and Oasis were analyzed only in the original density of the manufactured products. The impedance was measured by a metal probe and a digital micropenetrometer. The penetration pressure is correlated to the level of compactation of the media, with significant interaction between compactation and moisture level.

Avaliação do crescimento de plantas de morangueiro, durante a aclimatização ex vitro

A study was carried out in the Faculdade de Agronomia da Universidade Federal do Rio Grande do Sul to optimize the process of micropropagation of strawberry plants (cultivar Campinas) and to reduce plant losses during acclimatization. The objective of this experiment was to relate plant tissue sucrose levels to biomass production during acclimatization. Strawberry seedlings were grown in vitro, rooted for three weeks under four sucrose levels (15, 30, 45, and 60 g L-1), and transplanted to polyethylene trays bearing 72 cells. The experimental units were arranged in a complete randomized blocks design with five replications. Each plot comprised 36 seedlings and a total of 720 plants. There were evaluated the plants survival rate (%), growing rate (mg week-1), leaf area (cm2), dry matter (mg) of the above ground plant parts, specific leaf area (cm2 mg-1), leaf mass ratio (mg mg-1), and leaf area ratio (cm2 mg mg-1). Best ex vitro biomass production, was obtained using 45 g L-1 sucrose rate, in MS medium for growth of Campinas strawberry plants. Also, strawberry seedlings needed three to four weeks to adapt themselves to the new ambient conditions and to resume their growing.

Diagnóstico da floricultura no Rio Grande do Sul

A survey was conducted to quantify flower and ornamental plant production in the State of Rio Grande do Sul State, Brazil. The Brazilian Floriculture Institute (IBRAFLOR) and the Agriculture Ministry (MAARA - DENACOOP) granted this research. Based on an inventory formulary a catalog including the nurseries, addresses and main crops was elaborated. There are 257 growers in this State with an area of 304ha distributed among 65 counties; 30% of this area are cultivated with cut flowers, 33% with annuals and perennials for garden, 29% with other floriculture products and 8% with potted plants. The main system of cultivation is not protected with low technological investments.