Potential of Pinus elliottii Engelm. needles as substrate conditioner for the production of “Fepagro C37 reck”Citrus rootstocks”

Abstract The production of citrus seedlings in protected environment requires a large amount of substrate, which must have adequate physical and chemical characteristics. The use of acidic conditioners, such as Pinus needles mixed with alkaline substrates, allows the cultivation of seedlings with better quality. The objective of this work was to evaluate the development of the “Fepagro C37 Reck” rootstock grown in different alkaline commercial substrate mixtures (Humosolo ES®) with Pinus elliottii needles. The experiment was carried out by testing alkaline substrate mixed with 5-month old of decomposition Pinus needles in situ decomposition and two granulometry sizes, 3.5 and 8.0 mm. The mixtures were performed in proportions between the needles with the Humosolo, (v / v) 0%; 25%; 50%; 75% and 100%. Expanded cellular polystyrene trays were used to accommodate the mixtures and seeding of the rootstock. Physical and chemical evaluateons of the mixtures were carried out, as well as the development of the seedlings. The use of Pinus needles acidified the substrate Humosolo ES®, reduced its electrical conductivity and increased the percentage of porous space of the mixtures and reduced water retention. The treatments containing 25 and 50% of the Pinus needles mixture, regardless of the granulometry, provide greater development of rootstock plants “Fepagro C37 Reck”.

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Design of a hierarchically structured hybrid material via in situ assembly of a silica aerogel into a wood cellular structure

RSC Advances ◽

10.1039/c6ra12480a ◽

2016 ◽

Vol 6 (67) ◽

pp. 62825-62832 ◽

Cited By ~ 5

Author(s):

M. Sedighi Gilani ◽

S. Zhao ◽

S. Gaan ◽

M. M. Koebel ◽

T. Zimmermann

Keyword(s):

Thermal Conductivity ◽

Hybrid Material ◽

Dimensional Stability ◽

Silica Aerogel ◽

Cellular Structure ◽

Water Retention ◽

Heat Of Combustion ◽

Structure Modification ◽

Reduced Water

We present a route for incorporation of silica aerogel into wood cellular structure. Modification results in an improved dimensional stability and reduced water retention of the material, with lower thermal conductivity and total heat of combustion.

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CHEMICAL, PHYSICAL, AND LAND-USE INVESTIGATIONS OF ORGANIC TERRAIN

Canadian Journal of Soil Science ◽

10.4141/cjss75-041 ◽

1975 ◽

Vol 55 (3) ◽

pp. 331-342 ◽

Cited By ~ 4

Author(s):

M. E. WALMSLEY ◽

L. M. LAVKULICH

Keyword(s):

Water Retention ◽

Particle Density ◽

Organic Soil ◽

Surface Expression ◽

Organic Soils ◽

Sampling Area ◽

Temperature Conductivity ◽

Water Retention Properties ◽

Physical And Chemical

Chemical and physical properties of selected organic soil samples were studied in relation to the chemical status of the associated ground water. Soil analyses included standard chemical analyses, fibre content, bulk density, particle density, hydraulic conductivity and water retention properties. In situ water chemical analysis included temperature, conductivity, dissolved oxygen and pH. Laboratory measurements of dissolved Ca, Mg, N, K, Si, NO3, F and Cl are also reported. The results are interpreted with reference to the surface expression and overall terrain morphology of the sampling area resulting in the formation of different peat types and associated vegetation. Physical and chemical data indicate a relationship between degree of decomposition and magnitude of various parameters. The distinction between bog and fen areas in terms of the level of dissolved electrolytes permits the prediction of the nature of the material comprising the organic soil. The distinctive properties of organic soils are discussed in terms of some use constraints imposed by the nature of the material in the context of afforestation of this terrain type.

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Quality of Heliconia psittacorum seedlings grown on different substrates

Ornamental Horticulture ◽

10.14295/oh.v21i3.870 ◽

2016 ◽

Vol 21 (3) ◽

pp. 387

Author(s):

Raimundo Luiz Laurinho dos Santos ◽

José Antonio Saraiva Grossi ◽

Rogério Gomes Pêgo ◽

José Geraldo Barbosa

Keyword(s):

Electrical Conductivity ◽

Chemical Characteristics ◽

Physical Analysis ◽

High Electrical Conductivity ◽

Coconut Husk ◽

The Matrix ◽

Main Component ◽

Physical And Chemical ◽

All Treatment

The production of good seedlings depends on the quality of the matrix and propagation techniques used. In choosing a substrate should be particularly observed physical and chemical characteristics. The objective of this study was to assess the development and vigor of heliconia seedlings from Heliconia psittacorum species, grown on different substrates and mixtures. The materials that form the treatments were: burnt rice husk (RHB), vermiculite (VC), sugarcane waste burnt (SWB), subsoil (S), chicken bedding (CB), cattle manure (CM), earthworm humus (EH), coconut husk powder (CSP) and Horticultural Plantmax (HP). The treatments chosen were: 1( ⅔ CM + ⅓ CSP), 2( ⅔CM + ⅓RHB), 3( ⅔CB + ⅓ SWB), 4(CSP), 5(½VC+ ½SWB), 6(⅔ S + ⅓ CB), 7(⅓CM + ⅔SWB), 8(⅔ CM + ⅓SWB), 9(⅔CB + ⅓RHB), 10(⅓CM + ⅔RHB), 11(⅓CB + ⅔SWB), 12(⅔CB + ⅓CSP), 13(⅔EH + ⅓CSP), 14(⅔EH + ⅓SWB), 15(⅓CB + ⅔RHB), 16(⅓EH + ⅔SWB), 17(⅔EH + ⅓RHB), 18( ½VC + ½RHB), 19(S), 20(⅔ S + ⅓ CM), 21(⅔ S + ⅓ EH), 22(EH), 23(HP), 24(⅓EH + ⅔RHB). Samples of all treatment compositions were taken and carried out chemical and physical analysis. A set of ten treatments (1, 2, 5, 7, 8, 10, 14, 16, 20 and 22) basically consisting of CM EH, RHB, CSP and SWB produced the best seedlings and treatment with CB as a main component or not produced the worst seedlings due to high electrical conductivity

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БЕЗКОНТАКТНИЙ МЕТОД ТРИПАРАМЕТРОВОГО ВИМІРЮВАЛЬНОГО КОНТРОЛЮ ФІЗИКО-ХІМІЧНИХ ХАРАКТЕРИСТИК ЗРАЗКА ФЕРОМАГНІТНОЇ РІДИНИ

Bulletin of the Kyiv National University of Technologies and Design Technical Science Series ◽

10.30857/1813-6796.2018.4.8 ◽

2018 ◽

Vol 124 (4) ◽

pp. 77-84

Author(s):

В. В. Себко ◽

В. Г. Здоренко

Keyword(s):

Electrical Conductivity ◽

Magnetic Permeability ◽

Electromagnetic Method ◽

Specific Electrical Conductivity ◽

Parameter Method ◽

Chemical Characteristics ◽

Parameter Control ◽

Relative Magnetic Permeability ◽

Physical And Chemical ◽

Measuring Control

The aim of the article is to investigate the method of three-parameter control of a sample of a ferromagnetic liquid, the realization of which is carried out on the basis of a noncontact transformer electromagnetic converter (TEC) with samples of ferromagnetic liquids in a longitudinal magnetic field.We used a technique for studying samples of a ferromagnetic liquid for the realization of a three-parameter electromagnetic method for measuring the physical and chemical characteristics of ferromagnetic liquids based on thermal TEC. The three-parameter method of measuring control of the relative magnetic permeability mr, the specific electrical conductivity σ, and the temperature t of a sample of a ferromagnetic liquid, which is monitored on the basis of measurements and analysis of signals of a thermal contactless three-parameter TEC, is studied. The theoretical principles of the operation of a contactless thermal TEC with a sample of a ferromagnetic liquid are based on the realization of a three-parameter method for measuring the monitoring of magnetic, electrical, and temperature parameters.

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Physical and Chemical Characteristics of a Commercial Potting Substrate Amended with Vermicompost Produced from Two Different Manure Sources

HortTechnology ◽

10.21273/horttech.17.3.336 ◽

2007 ◽

Vol 17 (3) ◽

pp. 336-340 ◽

Cited By ~ 12

Author(s):

Gary R. Bachman ◽

James D. Metzger

Keyword(s):

Electrical Conductivity ◽

Beef Cattle ◽

Nitrate Nitrogen ◽

Chemical Characteristics ◽

Air Volume ◽

Alternative Materials ◽

Calcium Magnesium ◽

Physical And Chemical ◽

Water Holding ◽

Nitrogen Phosphorus

Interest in using alternative materials for potting substrate is increasing in response to availability and rising costs of peat and other conventional materials. Vermicompost (VC) is one such material. It is important to understand physical and chemical changes in potting substrate when amended with VC produced from different waste sources, pig (PVC) and beef cattle (BVC) manure in this study. Distribution of particles greater than 2 mm decreased, particles 0.5 to 1 mm increased, and particles less than 0.5 mm remained unchanged as PVC and BVC amendment increased. Dry bulk density and water-holding capacity increased with increasing PVC and BVC amendment. Porosity and air volume were inversely related to VC amendment, decreasing with increasing VC amendment. Saturated substrate extract sampling revealed nitrate nitrogen, phosphorus, calcium, magnesium, zinc, copper, iron content as well as electrical conductivity increased with increasing PVC and BVC amendment.

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Characterization of defects in tabular silver halide grains

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100178367 ◽

1990 ◽

Vol 48 (4) ◽

pp. 1046-1047

Author(s):

C. Goessens ◽

D. Schryvers ◽

J. Van Landuyt ◽

A. Verbeeck ◽

R. De Keyzer

Keyword(s):

Radiation Damage ◽

Silver Halide ◽

Chemical Characteristics ◽

X Ray ◽

Free Region ◽

Central Defect ◽

Crystallographic Defects ◽

Physical And Chemical ◽

Two Sides

Silver halide grains (AgX, X=Cl,Br,I) are commonly recognized as important entities in photographic applications. Depending on the preparation specifications one can grow cubic, octahedral, tabular a.o. morphologies, each with its own physical and chemical characteristics. In the present study crystallographic defects introduced by the mixing of 5-20% iodide in a growing AgBr tabular grain are investigated. X-ray diffractometry reveals the existence of a homogeneous Ag(Br1-xIx) region, expected to be formed around the AgBr kernel. In fig. 1 a two-beam BF image, taken at T≈100 K to diminish radiation damage, of a triangular tabular grain is presented, clearly showing defect contrast fringes along four of the six directions; the remaining two sides show similar contrast under relevant diffraction conditions. The width of the central defect free region corresponds with the pure AgBr kernel grown before the mixing with I. The thickness of a given grain lies between 0.15 and 0.3 μm: as indicated in fig. 2 triangular (resp. hexagonal) grains exhibit an uneven (resp. even) number of twin interfaces (i.e., between + and - twin variants) parallel with the (111) surfaces. The thickness of the grains and the existence of the twin variants was confirmed from CTEM images of perpendicular cuts.

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