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Search Results: 1 - 10 of 198002 matches for " Atelene N; "
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Densidade de substratos dependendo dos métodos de análise e níveis de umidade
Fermino, Maria Helena;K?mpf, Atelene N;
Horticultura Brasileira , 2012, DOI: 10.1590/S0102-05362012000100013
Abstract: the term "substrate for plants" refers to the growth medium used in cultivation in containers, often resulting from the mixture of materials. the final quality depends on the physical and chemical attributes of each component and the interaction among them, which need to be characterized. although the reference works are unanimous including volumetric density for substrate characterization, the interpretation of reports from different laboratories is difficult, because they use different methods or variations of the same method. in addition to the differences between methods, there might be other causes of variation in the achievement of results from a single sample. this work aims to demonstrate two of the causes of variation in the determination of density by volume: 1) the method of analysis [method of double ring (cen), the method used by the industry (ind) and method of auto compact (auto) of substrate dust] of coconut, washed sand of river, peat brown in natura and plantmax? for horticulture; 2) and the initial level of humidity (0.62, 0.69 and 0.72 g/g) in in natura samples of peat brown. the density values, determined by the auto, represented about 20% more than the values determined by ind; relations between the auto and cen methods as well as cen and ind were not uniform, depending on the material. initial moisture of the sample also represents the cause of variation in the results.
Concentra??o de sacarose no enraizamento in vitro de morangueiro
Calvete, Eunice Oliveira;K?mpf, Atelene Normann;Suzin, Marilei;
Horticultura Brasileira , 2002, DOI: 10.1590/S0102-05362002000200014
Abstract: the vegetative propagation of strawberry plants allows dissemination of plant pathogens when infected plants are used. to avoid such pathogen transmission, especially viruses, plant merystem growing in vitro is usual. transfer of micropropagated seedlings to ex vitro conditions, however, is a delicate process. successful plant adaptation to ambient depends on optimum growing conditions including the rooting phase. this research was conducted at the universidade federal do rio grande do sul and universidade de passo fundo (brazil). the effect of sucrose concentration was quantified in the culture medium over rooting of strawberry plants. seedlings of cv. campinas were selected during multiplication and transferred to an "ms" (murashige & skoog) basic medium amended with bap (0.005 mg l-1) and different sucrose amounts (0; 15; 30; 45, and 60 g l-1). the experimental units were arranged according to a randomized block design with nine replicates, each replicate being a pot with five plants. the fresh and dry weight of leaves and roots were determined and used to calculate the content of water in plant tissues. while lack of sucrose resulted in no rooting, the concentration of 45 g l-1 provided the best root growth. therefore, campinas strawberry seedlings showed low photosynthetic capacity, behaving as mixotrophic or heterotrophic plants.
Propaga??o in vitro de Limonium latifolium Kuntze (Plumbaginaceae)
Fior, Claudimar Sidnei;Rodrigues, Lia Rosane;K?mpf, Atelene Normann;
Ciência Rural , 2000, DOI: 10.1590/S0103-84782000000400003
Abstract: 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 médium. 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 hás 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.
Diagnóstico da floricultura no Rio Grande do Sul
K?mpf, Atelene Normann;Daudt, Rafael Schüür;
Ciência Rural , 1999, DOI: 10.1590/S0103-84781999000300031
Abstract: 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.
Pesquisa Agropecuária Brasileira , 1999, DOI: 10.1590/S0100-204X1999001100024
Abstract: 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.
Concentra o de sacarose no enraizamento in vitro de morangueiro
Calvete Eunice Oliveira,K?mpf Atelene Normann,Suzin Marilei
Horticultura Brasileira , 2002,
Abstract: O morangueiro é uma espécie de propaga o vegetativa, o que explica a dissemina o de doen as, quando utiliza-se plantas infestadas. Uma forma de eliminar as viroses é através da cultura de meristemas. Uma das etapas mais delicadas do processo de micropropaga o é a transferência das mudas para condi es ex vitro. Para garantir sucesso durante a aclimatiza o, faz-se necessário otimizar todas as fases do cultivo. Entre essas, encontra-se a etapa de enraizamento. Esse trabalho foi realizado nos Laboratórios da UFRGS e da UPF com o objetivo de quantificar o efeito da concentra o de sacarose no meio de cultivo in vitro, na fase de enraizamento. Mudas da cultivar Campinas foram selecionadas na etapa de multiplica o e repicadas para o meio básico "MS" (Murashige & Skoog) acrescido de 0,005 mg.L-1 de BAP (Benzinoaminopurina) e diferentes concentra es de sacarose (0; 15; 30; 45 e 60 g.L-1). O delineamento experimental foi o de blocos casualizados com nove repeti es. Cada parcela constou de cinco plantas por frasco, perfazendo um total de 45 unidades amostrais. Nessa etapa foram avaliadas as massas fresca e seca das folhas e raízes (mg). A partir dessas foi calculado o conteúdo de água nos tecidos. Observou-se que na ausência de sacarose n o houve desenvolvimento da raiz in vitro. Plantas produzidas na concentra o de 45 g. L-1 de sacarose, apresentaram maior enraizamento. Dessa forma, mudas de morangueiro Campinas apresentaram baixa capacidade fotossintética, respondendo como plantas mixotróficas ou heterotróficas.
Avalia??o do crescimento de plantas de morangueiro, durante a aclimatiza??o ex vitro
Calvete, Eunice Oliveira;K?mpf, Atelene Normann;Bergamaschi, Homero;Daudt, Rafael Henrique Schüür;
Horticultura Brasileira , 2000, DOI: 10.1590/S0102-05362000000300009
Abstract: 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 plant's 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.
Propriedades químicas e físicas de substratos de origem mineral e organica para o cultivo de mudas em recipientes
Schmitz, José Ant?nio Kroeff;Souza, Paulo Vítor Dutra de;K?mpf, Atelene Normann;
Ciência Rural , 2002, DOI: 10.1590/S0103-84782002000600005
Abstract: physical and chemical characterizations were done for five materials [soil, sand, peat scv, carbonized rice husk (crh) and decomposed acacia (acacia mearnsii) bark after tannin extraction (dab)] and some of their mixtures [soil + sand (1:1), soil + sand + crh (1:1:1), soil + sand + dab (1:1:1), peat + crh (2:1), peat + dab (2:1)], trying to identify which of them could be used as growing substrates for potted fruit and flower plant crops. the following properties were analyzed: water ph, salinity, cation extange capacity (cec), organic carbon levels, dry density, total porosity, air space, available water, remaining water and particles distribution. the growing media "peat scv + dab" showed upper chemical and physical properties for the horticultural purposes defined.
Uso de resíduos de couro wet-blue como componente de substrato para plantas
Daudt, Rafael Henrique Schüür;Gruszynski, Cirilo;K?mpf, Atelene Normann;
Ciência Rural , 2007, DOI: 10.1590/S0103-84782007000100015
Abstract: the industrial wet-blue leather standardization process generates a by-product called leather sawdust (rr). at the beginning of this century, the brazilian tanning industry rejected about 131 thousand tons of rr in the environment. the present study investigated the possibility of using rr as a component for growing media. seedlings of tagetes patula l. ?aurora? were transplanted in 24 cell packs (216ml each cell) containing blends of rr and the mixture cacv (carbonized rice husks: fine vermiculite; 6:1 - v:v) in the following volumetric proportions: 0:1 (100% cacv) , 1:3, 1:1, 3:1, 0:1 (100% rr). the mixes were analyzed concerning ph value, salinity, bulk density and water retention curves. increasing rr fraction reduced bulk density while increased the total porosity and the amount of water in micropores. the high salt content of rr (> 7g l-1 as kcl) and its natural low ph value (3,7 em h2o) can reduce plant development and therefore must be taken in to account. the results suggest the use of rr as a component for growing media in amounts up to 50% in volume.
Acúmulo de macronutrientes em plantas de crisantemo sob cultivo hidrop?nico em argila expandida para flor-de-corte
Barbosa, José Geraldo;Martinez, Hermínia Emília Prieto;Kampf, Atelene Normann;
Pesquisa Agropecuária Brasileira , 1999, DOI: 10.1590/S0100-204X1999000400010
Abstract: 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.
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