FORMATION D’HORIZONS CIMENTES DANS LES SOLS SABLEUX DU DELTA DES RIVIERES MANICOUAGAN ET OUTARDES, QUEBEC

1980 ◽  
Vol 60 (2) ◽  
pp. 163-175 ◽  
Author(s):  
F. PAGÉ ◽  
M. ROMPRÉ ◽  
C. R. DE KIMPE ◽  
G. A. BOURBEAU
Keyword(s):  
Podzolic Soil ◽  
Fine Particles ◽  
Lower Layer ◽  
Mineral Deposits ◽  
Shallow Waters ◽  
Podzolic Soils ◽  
The Third ◽  
Massive Structure ◽  
Organic Deposits ◽  
Micromorphological Analysis

Three profiles, one Fibrisol and two Podzols, developed on the deltaic sediments of the Manicouagan and Outardes rivers, have been analyzed. The mineral deposits contain two different layers. The upper one, rich in silt and clay, corresponds to the latest stage of sedimentation in shallow waters, while the lower layer is sandy in texture. The impervious nature of the upper layer due to a massive structure and a large content of fine particles has favored the formation of very extensive peatlands. At the edge of the former beachline, drainage is improved and Podzolic soils have developed. The fine-textured layer found under the organic deposits of the Fibrisol is partially disrupted by the roots in the Podzolic soil. In the third profile, this layer is more completely disorganized but the A and B horizons still contain relic fragments, which are cemented by podzolic material. At depth, this profile also contains cemented horizons. Cement is composed of podzolic material and illuviated clay. Micromorphological analysis contributed to an explanation of the evolution of the spodic organizations in the soils and to an understanding of the origin and formation of the cemented horizons.

DETERMINING AMMONIUM OXALATE-EXTRACTABLE Si IN SOILS

1986 ◽  
Vol 66 (4) ◽  
pp. 751-755 ◽  
Author(s):  
C. WANG ◽  
P. A. SCHUPPLI
Keyword(s):  
Atomic Absorption ◽  
Key Words ◽  
Podzolic Soil ◽  
Ammonium Oxalate ◽  
Podzolic Soils ◽  
Significant Difference ◽  
Key Words Oxalate

Determination of oxalate-extractable Si and Al is useful in assessing the degree of accumulation of allophane-like materials in Podzolic soils. Three procedures were tested for determining Si: manual spectrophotometry, automated spectrophotometry and atomic absorption. For concentrations of oxalate-extractable Si above 0.5 g kg−1, there was no significant difference among results by the three procedures. For lower concentrations of Si, results by atomic absorption were higher than those by the spectrophotometric procedures. Determination by Si by autoanalyzer is the preferred procedure as it is convenient, sensitive and reliable. Key words: Oxalate Si, Podzolic soil, autoanalyzer

scholarly journals Three new species of Scissurellidae (Gastropoda, Prosobranchia) from the coast of Brazil

1972 ◽  
Vol 21 (0) ◽  
pp. 01-13 ◽  
Author(s):  
Pierre Ch. Montouchet
Keyword(s):  
New Species ◽  
Sao Paulo ◽  
The State ◽  
Shallow Waters ◽  
Brazilian Coast ◽  
São Paulo ◽  
Internal Anatomy ◽  
The Third ◽  
Deep Waters ◽  
Three New Species

A consultation of the original descriptions of the genera of Scissurellidae led the author to conclude that the valid names for the genera of this family are: Scissurella d'Orbigny, 1823 (redescription by Sowerby, 1824), Anatoma Woodward, 1859, Inoisura Hedley, 1904, Scissurona Iredale, 1924, Sinezona Finlay, 1927. Scissurella and Anatoma are cosmopolites, the first generally living in shallow waters, associated to sea-weeds, while the second is found in deep waters. The three last genera are restricted to Australasia. Three new species are described from the Brazilian coast: Soissu rella alexandrei, Scissurella eleotilis and Scissurella morretesi. The internal anatomy of S. alexandrei is described. These three new species have been found in littoral shallow waters, the two first on the northeast Brazilian coast, the third on the coast of the State of São Paulo. The fourth known species of Scissurellidae from Brazil, Anatoma aedonia (Watson, 1886), was dredged by H.M.S, "Challenger", in 1873, off Pernambuco, 350 fm (640 m).

scholarly journals Effect of Biochar on TDR-Based Volumetric Soil Moisture Measurements in a Loamy Sand Podzolic Soil

Soil Systems ◽  
2019 ◽  
Vol 3 (3) ◽  
pp. 49 ◽  
Author(s):  
Wanniarachchi ◽  
Cheema ◽  
Thomas ◽  
Galagedara
Keyword(s):  
Soil Moisture ◽  
Moisture Content ◽  
Soil Moisture Content ◽  
Podzolic Soil ◽  
Dielectric Constants ◽  
Loamy Sand ◽  
Typical Application ◽  
Podzolic Soils ◽  
Volumetric Soil Moisture ◽  
Time Domain Reflectometer

Considering the increased interests in biochar (BC) as a soil amendment and a growing media substrate in agriculture, we evaluated the effect of BC incorporation on TDR (time-domain reflectometer)-based volumetric soil moisture content (VSMC) estimations in a loamy sand podzolic soil. Two commercial BC types (powdered—BCP, and granular—BCG) were mixed in different rates (w/w) with a podzolic soil. The dielectric constants measured using a TDR cable tester (MOHR CT 100) were converted to VSMC. Three commonly used models: (i) Topp’s equation, M-1; (ii) mixing model, M-2; and (iii) the forest soil model, M-3, were used. The accuracy of the estimated VSMC using these three models was statistically compared with measured VSMC. BCP at lower rates produced very similar results to the actual VSMC with M-1 and M-2 but deviated with increasing rates. The M-3 showed a non-linear relationship with measured VSMC. In BCG treatments, all models overestimated the VSMC. BCG rates higher than 15% (w/w) resulted in highly attenuated TDR waveforms and the signal was completely dissipated when rates higher than 50% (w/w) were used (typical application for field soils is less than 5% w/w). These results showed that predictions of the soil moisture content based on the soil dielectric constant might not be feasible for tested podzolic soils amended at high BC rates.

scholarly journals Fruiting of High-density Apple Orchards on Clonal Rootstocks

HortScience ◽  
1996 ◽  
Vol 31 (4) ◽  
pp. 665e-665
Author(s):  
A.S. Devyatov
Keyword(s):  
Podzolic Soil ◽  
Tree Density ◽  
High Density ◽  
Annual Precipitation ◽  
Apple Orchards ◽  
Average Yield ◽  
The Third ◽  
Initial Yield ◽  
Nursery Trees ◽  
All Treatment

Orchard densities from 833 to 2500 trees/ha were studied on sod-podzolic soil (annual precipitation 550 mm). An orchard was planted in Spring 1990 and 1991 using 2-year-old nursery trees grown in film containers. The interval between trees in the row was 1 to 1.5 to 2 to 2.5 and 3 m. The trees were grafted on dwarf rootstock (62-396) and semi-dwarf (54-118). The commercial fruiting of `Tellisaare' began the third year after planting, `Antey' the fourth, and Spartan at fifth. The initial yield of `Antey in the most dense treatment was 14.5 t·ha–1, `Tellisaare' was 15 to 22 t·ha–1, according to rootstocks. Average yield of `Antey' on 62-396 for 1992–95 at the orchard density of 2500 trees/ha was 10 t·ha–1·year–1 and on rootstock of 54-118 it was 21 t·ha–1. However, yield of `Tellisaare' 54-118 for 1992–1995 was 13 to 15 t·ha–1 in all treatment of orchard density from 1666 to 833 trees/ha. The annual yield of this cultivar grafted on rootstock 54-118 at a tree density of 2500 plants/ha increased to 18.3 t·ha–1.

scholarly journals Efektivitas Antioksidan Likopen Pada Buah Tomat (Lycopercisum esculentum) Terhadap Normalitas dan Abnormalitas Spermatozoa Sapi Bali dengan Metode Swim up.

bionature ◽  
2021 ◽  
Vol 22 (1) ◽  
Author(s):  
Syuhriatin Syuhriatin
Keyword(s):  
Storage Time ◽  
Lower Layer ◽  
Tomato Fruit ◽  
Treatment Combination ◽  
The Third ◽  
Randomized Design ◽  
Negative Effect ◽  
Completely Randomized Design ◽  
The Difference ◽  
Artificial Vagina

Abstract. This research is a type of experimental research carried out in a laboratory with the aim of knowing a symptom or effect that arises as a result of certain treatments. The research was conducted at the Immunobiology Laboratory, Faculty of Mathematics and Natural Sciences, Mataram University. The material used in the study was 1 male Bali cow, about 3.5 years old with a cow weight of 460 kg, which the semen was collected using an artificial vagina. The experimental design used in this study was a completely randomized design which was arranged in a factorial design consisting of 3 (three) factors. The first factor is the difference in layer (L) which consists of 2 (two) levels, namely the Upper Layer (LA) and the Lower Layer (LB). The second factor is the concentration of tomato lycopene (P) consisting of 5 (five) levels, namely: 0% (P0), 5% (P1), 10% (P2), 15% (P3) and 20% (P4). The third factor is storage time (H) which consists of 6 (six factors), namely 1 day (H1), 2 days (H2), 3 days (H3), 4 days (H4), 5 days (H5) and 6 days. (H6). The three factors combined to produce 60 treatment combinations, each treatment combination was repeated 6 (six) times so that there were 360 experimental units. The results of the analysis of variance showed that the addition of the tomato fruit lycopene antioxidant and the separation by the swim up method had no significant effect (P> 0.05) on the normality and abnormality of spermatozoa. The addition of tomato fruit lycopene antioxidants and the separation using the swim up method did not have an effect on increasing spermatozoa abnormalities, but did not have a negative effect on the spermatozoa of bali cattle.Keywords: antioxidant, tomato fruit, spermatozoa, bali cow

Isolation of Bdellovibrio spp. that prey on Azospirillum brasilense in soil

1987 ◽  
Vol 33 (5) ◽  
pp. 459-461 ◽  
Author(s):  
James J. Germida
Keyword(s):  
Growth Rate ◽  
Azospirillum Brasilense ◽  
Podzolic Soil ◽  
Enterobacter Aerogenes ◽  
Broth Culture ◽  
E Coli ◽  
Podzolic Soils ◽  
Ensifer Adhaerens ◽  
Attack Phase ◽  
Curved Rods

Bdellovibrios that prey on Azospirillum brasilense were isolated from a Latosol and a Podzolic soil from Brazil which were stored air-dried for 2 years. The addition of A. brasilense strain Cd or Sp 7 cells and nutrients to these soils stimulated growth of indigenous bdellovibrios; direct assay of these soils did not yield bdellovibrios. Two other Podzolic soils from Brazil and three Chernozemic soils from Canada did not contain detectable bdellovibrios. After enrichment with strain Cd cells, the Podzolic soil yielded 1340 bdellovibrios per g of soil, whereas enrichment with strain Sp 7 cells yielded only 50. Escherichia coli and Enterobacter aerogenes cells did not stimulate growth of bdellovibrios in this soil, but did stimulate growth of bdellovibrios in the Latosol as did strains Cd and Sp 7. The morphology of an azospirilla-attacking Bdellovibrio, isolated from the Podzolic soil, was typical of the genus; attack-phase cells were curved rods, 0.2–0.4 by 1.0–1.3 μm, motile by means of a single polar flagellum. In broth culture this Bdellovibrio isolate preyed on several different gram-negative bacteria, although the apparent growth rate on prey cells was A. brasilense strain Cd > strain Sp 7 > A. lipoferum strain Sp Br 17 = E. coli = E. aerogenes > A. brasilense strain Sp 35. Pseudomonas fluorescens, Ensifer adhaerens, and 20 unidentified bacterial isolates from the Podzolic soil were not suitable prey. These results indicate that Bdellovibrio survive in some air-dry soils at undetectable levels but respond quickly to the presence of a large number of prey cells. In addition, the presence in soil of bdellovibrios that exhibit a faster growth rate on A. brasilense strain Cd than on strain Sp 7 cells and other azospirilla indicates potential problems when using strain Cd as a crop inoculant in certain soils.

scholarly journals Water erosion and characteristics of sediment load in the Kopaninský stream basin

2009 ◽  
Vol 4 (No. 1) ◽  
pp. 39-46 ◽  
Author(s):  
J. Uhlířová ◽  
M. Kaplická ◽  
T. Kvítek
Keyword(s):  
Fine Particles ◽  
Lower Layer ◽  
Extreme Rainfall ◽  
Curve Number ◽  
Soil Material ◽  
Erosion Prediction ◽  
Water Courses ◽  
Riparian Grassland ◽  
Event Based ◽  
Fuzzy Boundary

In May 2005, a major part of the Czech Republic was hit by an extreme rainstorm resulting in both soil erosion and flood events. We surveyed the erosion rills and soil material deposits produced by this rainstorm in the most damaged field of the experimental catchment Kopaninsky stream in the Bohemo-Moravian Highland. We measured the volume of the deposited sediment, its texture, bulk density, and other properties. The sediment consisted of two layers with a fuzzy boundary between them. The lower layer contained more fine particles, while the upper layer was mainly formed by a coarser material. The sediment generally contained lower amounts of C<sub>ox</sub> and available nutrients than the original soil from which it was eroded. The results of the measurements were put into a broader context by using an event-based erosion prediction model ERCN, based on the curve-number method and on the Universal Soil Loss Equation. It was demonstrated that a 75 m wide riparian grassland strip in the study area was able to detain about 70% of the soil material eroded from the uphill ploughed land during the extreme rainfall-runoff event of 23<sup>rd</sup> May 2005. It was confirmed that grassland and other vegetation strips along water courses are highly efficient in reducing the surface water pollution during extreme erosion events.

Splitting marine controlled-source electromagnetic responses into sea and subseafloor contributions: Grounding the air wave

Geophysics ◽  
2017 ◽  
Vol 82 (6) ◽  
pp. E315-E323
Author(s):  
Armando Calderón-Moctezuma ◽  
Enrique Gómez-Treviño ◽  
Luis A. Gallardo
Keyword(s):  
Water Depth ◽  
Skin Depth ◽  
Shallow Waters ◽  
Resistive Layer ◽  
Controlled Source ◽  
The Third ◽  
Inhibiting Effect ◽  
Electromagnetic Responses ◽  
Induction Zone ◽  
Water Depths

We have found how the effects of the air wave in marine controlled-source electromagnetic (CSEM) methods gradually vanish in the sea for shallow waters, and how at the same time they gradually grow below the seafloor, in an effort to comprehend existing detectability definitions. The transition from sea to land is smooth because the sea becomes a thin conductive layer when the water depth is smaller than the skin depth in the sea. We consider the problem of detecting resistive layers at depth associated with hydrocarbon reservoirs, particularly in shallow-water explorations and, specifically, on how the air wave affects detection. Our analysis is based on an integral representation of the electric field in terms of its sensitivity to changes in the electrical conductivity of a 1D profile. Two-dimensional images of the integrands are obtained by plotting the integrand as a function of depth for different offsets. Results include the expected growth of the inhibiting effect of the sea as the water depths decrease. However, we also find that this happens up to a point and that from then on its effect decreases to zero. Regarding the resistive layer at depth, its importance grows to a constant as the water depth decreases to zero. As a function of offsets, there appear first the direct current effects. The induction zone is next and is dominated by contributions from the underlying formations. The third zone, which corresponds to the air wave, is largely dominated by contributions from the sea. The fourth and last zone is the plane-wave asymptote. All four classical zones identified in marine CSEM are also present in land CSEM.

scholarly journals ANALISIS KEUNTUNGAN USAHATANI BAWANG DAUN DI DESA BONGKUDAI UTARA KECAMATAN MOOAT KABUPATEN BOLAANG MONGONDOW TIMUR

2019 ◽  
Vol 15 (1) ◽  
pp. 45
Author(s):  
Elsa Novera Mamusung ◽  
Leonardus Ricky Rengkung ◽  
Celcius ., Talumingan
Keyword(s):  
Data Collection ◽  
Random Sampling ◽  
Sampling Method ◽  
Lower Layer ◽  
Secondary Data ◽  
Middle Layer ◽  
Primary Data ◽  
University Faculty ◽  
Stratified Random Sampling ◽  
The Third

This study aims to analyze how much profit the farmers get in the activities of scallion farming in North Bongkudai Village, Mooat District, East Bolaang Mongondow Regency. The study was conducted for 3 months from October to December 2018. The data used in this study were primary data and secondary data. Primary data collection is through direct interviews with 60 respondents using the stratified random sampling method. Interviews were conducted based on a previously prepared questionnaire, and secondary data was obtained from the Bolaang Mongondow East Agriculture Office, North Bongkudai Village Office, Sam Ratulangi University Faculty of Agriculture Library, and Local Book Stores. The analysis in this study is qualitative and quantitativeanalysis presented in table form and then described descriptively. The results showed that the amount of profit of the scallion farmers per bed in Bongkudai Utara village in the first strata (lower layer) was Rp.426,664, while for the second strata (middle layer) was Rp.439,185 and for the third strata (upper layer) was Rp. 1,227,853. The highest profit of scallion farmers in Bongkudai Utara Village is in the third strata, reaching Rp1,227,853 per bed.*lrr+eprm*

scholarly journals The effect of organic fertilizers on the physico-chemical and agrochemical properties of sod-podzolic soils

2021 ◽  
Vol 5 (47) ◽  
pp. 21-21
Author(s):  
Vladimir Sedykh ◽  
Vitaliy Savich ◽  
Oleg Efimov ◽  
Vasily Rashkovich
Keyword(s):  
Heavy Metals ◽  
Podzolic Soil ◽  
Humus Content ◽  
Organic Fertilizers ◽  
Chicken Manure ◽  
Podzolic Soils ◽  
Physico Chemical ◽  
Mobile Forms ◽  
Agrochemical Properties ◽  
Chemical Soil

Studies of the effect of litter chicken manure applied in doses of 500-1000 t/ha showed a significant increase in the humus content in soils up to 2.8-5.2%, led to an increase in the content of thermophilic microflora in soils up to 12 · 105 CFU/ g, to an increase in the content of mobile phosphates up to 1200 mg/kg. However, the content of mobile forms of heavy metals (Pb, Zn, Cu, Ni) also increased. The increase in humus content in soils positively correlated with the content of mobile phosphates (r up to 0.5). Keywords: SOD-PODZOLIC SOIL, FERTILIZERS, CHICKEN MANURE, AGROCHEMICAL AND PHYSICO-CHEMICAL SOIL PROPERTIES

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