GLORIA

GEOMAR Library Ocean Research Information Access

X

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Online Resource
    Online Resource
    Uso da equação logística no estudo de dose-resposta de glyphosate e imazapyr por meio de bioensaios
    FapUNIFESP (SciELO) ; 2000
    In:  Planta Daninha Vol. 18, No. 1 ( 2000), p. 17-28
    Details
    In: Planta Daninha, FapUNIFESP (SciELO), Vol. 18, No. 1 ( 2000), p. 17-28
    Abstract: The bioassay use is one of the more common techniques for evaluating an herbicide potential as well as identifying and quantifying its residues in soil or in water. In these studies it is very important to know the effects exerted by some variables on the biological material and almost always it is possible to relate them by a mathematical expression. A problem in obtaining the expressions is to find that one which better represents the dose-response relation. This work presents a comparative study between the logistic equation [y=a/(1+(X/b)c)] and the normal polynomial equations of 1o, 2o and 3o degrees. In evaluating the more adequate model for the dose-response study with glyphosate and imazapyr, some criteria of theoretical order and practical application were considered, and it was concluded that: a) the logistic function presents a significative estimate of its parameters for herbicide imazapyr and a justifiable biological reason for both herbicides; b) the characteristics of total dry biomass (BST), aerial part (BSA), root (BSR) and root length (CR) are adequate for the doseresponse relation studies; c) the I50 estimate is variable with the function and the evaluated characteristic; d) the tomato is more sensible to imazapyr.
    Type of Medium: Online Resource
    ISSN: 0100-8358
    URL: Article
    DOI: 10.1590/S0100-83582000000100002
    Language: Unknown
    Publisher: FapUNIFESP (SciELO)
    Publication Date: 2000
    detail.hit.zdb_id: 3129056-5
    detail.hit.zdb_id: 2152315-0
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 2
    Online Resource
    Online Resource
    Respiração microbiana do solo sob doses de glyphosate e de imazapyr
    FapUNIFESP (SciELO) ; 1999
    In:  Planta Daninha Vol. 17, No. 3 ( 1999-12), p. 387-398
    Details
    In: Planta Daninha, FapUNIFESP (SciELO), Vol. 17, No. 3 ( 1999-12), p. 387-398
    Abstract: The microbial degradation of herbicides in soil is affected by several factors such as the chemical and physical characteristics of the soil and the proper molecule which act continuously determining the degradation magnitude. Considering the large variability of the responses presented by these molecules in the soil as well as the scarce information about their behavior in tropical environments relatively to their degradation, a series of experiments was carried out under laboratory conditions aiming to verify the response of soil microbial activity by the soilCO2 evolution method under increasing doses of glyphosate and imazapyr (0; 4; 8 and 12 L ha-1 of the commercial product Roundup S.Aq.C. and Arsenal 250 S.Aq.C., respectively) in soils with different textures and chemical composition under three moisture contents (40; 70 and 100% of the moisture equivalent). The obtained results allowed to conclude that: a) the soil macrobiota is able to use the glyphosate and imazapyr as carbon sources; b) the soil moisture affects the microorganisms capacity to degrade the glyphosate and imazapyr; c) the 40% moisture in the studied soils caused the lowest influenced by the soil chemical and physical responses of microorganism activities characteristics. independently of the herbicide doses; d) the effect of imazapyr doses on the soil microbial activity is influenced by the soil chemical and physical characteristics.
    Type of Medium: Online Resource
    ISSN: 0100-8358
    URL: Article
    DOI: 10.1590/S0100-83581999000300007
    Language: Unknown
    Publisher: FapUNIFESP (SciELO)
    Publication Date: 1999
    detail.hit.zdb_id: 3129056-5
    detail.hit.zdb_id: 2152315-0
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 3
    Online Resource
    Online Resource
    Lixiviação de glyphosate e imazapyr em solos com diferentes texturas e composição química: I - método do bioensaio
    FapUNIFESP (SciELO) ; 2000
    In:  Planta Daninha Vol. 18, No. 1 ( 2000), p. 5-16
    Details
    In: Planta Daninha, FapUNIFESP (SciELO), Vol. 18, No. 1 ( 2000), p. 5-16
    Abstract: The herbicide mobility in the soil profile is influenced by several processes: retention, transformation and transport. This phenomenon knowledge is essential to the perfect comprehension of these product destines in the environment. Among the several techniques used in such studies, the bioassay method presents optimum representativeness. Because these characteristics and the scarce information about the herbicide mobility in soils under tropical conditions, a bioassay was carried out aiming to verify the vertical movement of glyphosate and imazapyr in soil columns with different textures and chemical composition using the tomato (Lycopersicon esculentum Mill var. Santa Clara) as test-plant. According to the results it may be concluded that: a) the bioassay detection boundary for both the glyphosate and imazapyr corresponds to the lowest I50 value obtained in the pattern curve that is 331.52 and 5.4 µg L-1 respectively; b) the concentrations of the biologically active glyphosate in the leaching products of Viçosa and Sabará soils are bellow the bioassay detection boundary; c) in the 1 cm column, the glyphosate presented a very low mobility in the studied soils; d) in the 30 cm column, the imazapyr mobility is greater in the sandy loam texture soil of Viçosa; e) the high clay and organic matter contents in Sabará soil present as the main retention factors of imazapyr in this soil.
    Type of Medium: Online Resource
    ISSN: 0100-8358
    URL: Article
    DOI: 10.1590/S0100-83582000000100001
    Language: Unknown
    Publisher: FapUNIFESP (SciELO)
    Publication Date: 2000
    detail.hit.zdb_id: 3129056-5
    detail.hit.zdb_id: 2152315-0
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 4
    Online Resource
    Online Resource
    Lixiviação de flumioxazin e metribuzin em dois solos em condições de laboratório
    FapUNIFESP (SciELO) ; 1999
    In:  Planta Daninha Vol. 17, No. 2 ( 1999-08), p. 207-215
    Details
    In: Planta Daninha, FapUNIFESP (SciELO), Vol. 17, No. 2 ( 1999-08), p. 207-215
    Abstract: This study was conducted to evaluate leaching of herbicides flumioxazin and metribuzin under greenhouse conditions, in a Utisol and a Oxisol (collected in two differents agricultural regions in the state of Minas Gerais) soils in two moisture conditions (wet and dry soil). Simulation of rainfall ( 45 mm and 90 mm) was done after application of flumioxazin (60 g/ha) and metribuzin (384 g/ha) in columns containing two soils under wet and dry conditions. Flumioxazin did not leach beyond 5 cm from the surface when applied in the sandy-loam soil. In the sandy soil, this herbicide reached a depth of 10 cm from the surface in the column. Metribuzin presented great mobility in both soils and moisture conditions, reaching depth of 20 cm in wet sandy-loam soil and 45 cm in dry sandy soil.
    Type of Medium: Online Resource
    ISSN: 0100-8358
    URL: Article
    DOI: 10.1590/S0100-83581999000200005
    Language: Unknown
    Publisher: FapUNIFESP (SciELO)
    Publication Date: 1999
    detail.hit.zdb_id: 3129056-5
    detail.hit.zdb_id: 2152315-0
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 5
    Online Resource
    Online Resource
    Mobilidade do dimethenamid em diferentes solos
    FapUNIFESP (SciELO) ; 1999
    In:  Planta Daninha Vol. 17, No. 1 ( 1999-04), p. 31-39
    Details
    In: Planta Daninha, FapUNIFESP (SciELO), Vol. 17, No. 1 ( 1999-04), p. 31-39
    Abstract: The mobility of herbicide dimethenamid in sand and soils from Monte Santo (sandy clay loam), Sete Lagoas (clay) and Três Marias (loamy sand) - MG was evaluated in greenhouse conditions using bioassay methodology. The herbicide was applied to the soil at a dose of 1.125 kg i.a. ha-1. After product application, a rainfall (45 and 90 mm) was simulated on top of column containing the samples. The experimental layout was randomized block design with 4 replications in a factorial scheme. The dimethenamid was strongly leached in sand substract. In the Três Marias soil dimethenamid achieved 10 to 15 cm depth with 45 mm rainfall simulation and 20 to 30 cm when 90 mm rainfall was used. Monte Santo and Sete Lagoas soils had a similar leaching behavior remaining in the first 5 cm of column.
    Type of Medium: Online Resource
    ISSN: 0100-8358
    URL: Article
    DOI: 10.1590/S0100-83581999000100003
    Language: Unknown
    Publisher: FapUNIFESP (SciELO)
    Publication Date: 1999
    detail.hit.zdb_id: 3129056-5
    detail.hit.zdb_id: 2152315-0
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 6
    Online Resource
    Online Resource
    Eluição de fósforo em relação ao tempo de difusão em colunas com agregados de um Latossolo Vermelho distrófico
    FapUNIFESP (SciELO) ; 2003
    In:  Revista Brasileira de Engenharia Agrícola e Ambiental Vol. 7, No. 1 ( 2003-04), p. 24-30
    Details
    In: Revista Brasileira de Engenharia Agrícola e Ambiental, FapUNIFESP (SciELO), Vol. 7, No. 1 ( 2003-04), p. 24-30
    Abstract: This study quantified phosphorus in effluents of a Brazilian Rodhic Haplustox (Red Latosol) aggregates, in relation to diffusion time, using distilled water, Mehlich-1 extractor (HCl 0.05 mol L-1 + H2SO4 0.0125 mol L-1), and ammonium acetate 0.1 mol L-1 solution at pH 7 as eluates. Treatments corresponded to a 4 x 5 factorial scheme: four aggregate classes (2.0-1.0, 1.0-0.5, 0.5-0.25, and 0.25-0.105 mm) and five diffusion times (0, 1, 2, 4, and 6 days). The columns which corresponded to zero diffusion time received an eluate volume equal to ten times the pore volume, collected in five effluent fractions, each one with two pore-volumes. In the remaining experimental units, the elutions were accomplished with two pore-volumes at intervals indicated for each diffusion time. The distilled water leached greater amount of phosphorus from the smallest aggregates which increased with the increasing diffusion time. The Mehlich-1 extractor leached three to sixty times more phosphorus than the distilled water, showing a reverse behavior in relation to aggregate class and contact time. Phosphorus quantities leached with the ammonium acetate solution did not reach the minimum concentration required for detection.
    Type of Medium: Online Resource
    ISSN: 1415-4366
    URL: Article
    DOI: 10.1590/S1415-43662003000100005
    Language: Unknown
    Publisher: FapUNIFESP (SciELO)
    Publication Date: 2003
    detail.hit.zdb_id: 2164420-2
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 7
    Online Resource
    Online Resource
    Deslocamento miscível de cátions básicos provenientes da água residuária de mandioca em colunas de solo
    FapUNIFESP (SciELO) ; 2006
    In:  Revista Brasileira de Engenharia Agrícola e Ambiental Vol. 10, No. 2 ( 2006-06), p. 456-465
    Details
    In: Revista Brasileira de Engenharia Agrícola e Ambiental, FapUNIFESP (SciELO), Vol. 10, No. 2 ( 2006-06), p. 456-465
    Abstract: This study aimed to determine the retardation factors and the diffusion-dispersion coefficients of the potassium, sodium, calcium and magnesium ions found in the cassava wastewater, as well as to simulate the resident concentrations in soil columns with 160 cm over a five-hours period. The trials were accomplished under laboratory conditions, by using percolation columns fulfilled with materials from the spodic ortic Quartzarenic Neosol (RQo), typical distrophic Yellow Latosol (LAd) and typical distrophic Yellow Red Latosol (LVAd). The data of the ion concentrations in effluent were analyzed, by using the miscible fluid displacement methodology. The highest values of the retardation factors occurred in the LVAd soil, relative to LAd and RQo soils, pointing out a higher retention of the potassium, sodium, calcium and magnesium ions in the LVAd soil. The values of the diffusive-dispersive coefficients decreased from LVAd toward the RQo soil, whereas the highest value occurred in the RQo soil for the potassium ion and the lowest in the LVAd soil for calcium ion. The simulation of the cassava wastewater application over a five-hours period showed little advance of these ions in the LVAd soil column, comparative to the advance occurred in the RQo and LAd soils, therefore warning about the dangers of the underground water contamination, when applying the cassava wastewater on these two soils.
    Type of Medium: Online Resource
    ISSN: 1415-4366
    URL: Article
    DOI: 10.1590/S1415-43662006000200029
    Language: Unknown
    Publisher: FapUNIFESP (SciELO)
    Publication Date: 2006
    detail.hit.zdb_id: 2164420-2
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...