Temat: bulk density - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Hydraulic Properties of Soils of Akani Esuk Orok in Calabar, Cross River State, Nigeria
Autorzy:: Akpa, E. A.
Eyong, M. O.
Afu, S. M.
Olim, D. M.
Tematy:: Bulk density
Hydraulic conductivity
Particle density
Texture
Total porosity; Pokaż więcej
Data publikacji:: 2019
Powiązania:: https://bibliotekanauki.pl/articles/1078119.pdf Link otwiera się w nowym oknie
Źródło:: World News of Natural Sciences; 2019, 22; 102-109
2543-5426
Pojawia się w:: World News of Natural Sciences
Opis:: The study highlights the hydraulic properties of Akani Esuk Orok in Calabar, Cross River State, Nigeria. Twenty soil samples were collected from Akani Esuk in Calabar on a grid measuring 6 m X 6 m at a distance of 2 m apart to determine the hydraulic conductivity and to assess its influence on bulk density, particle density, total porosity and texture. The mean value of hydraulic conductivity was 14. 91cmhr-1, bulk density1.3 g cm-3, particle density 2.5 g cm-3, total porosity 47.6 %, sand content 80.1 %, silt content 8.4 % and clay content 11.5 %. The texture of the experimental plot was loamy sand. The mean values of pH were 5.4; effective cation exchange capacity (ECEC) was 63.9 cmol kg-1.These values, which are rated medium for the soils are probably responsible for the luxuriant growth of several crops cultivated in the area. The mean base saturation of the soils was 58.3 %. The potassium level of the study area was low, a mean value of 0.11 2 mg kg-1. Though the soils were strongly acidic in reaction and the fertility status was considered low, medium and high taking consideration values of organic carbon, total nitrogen, ECEC and base saturation. Hence, the fertility should be maintained by planting Calopogonium municoides, Centrosema pubescens and adoption of appropriate cultural practices.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Wpływ aglomeracji w mechanicznie generowanym złożu fluidalnym na gęstość i porowatość modelowej żywności w proszku
The influence of agglomeration in mechanically generated fluid bed on density and porosity of modeled food powders
Autorzy:: Domian, E.
Burdzanowska, D.
Tematy:: aglomeracja
gęstość nasypowa
porowatość
agglomeration
bulk density
porosity; Pokaż więcej
Data publikacji:: 2006
Powiązania:: https://bibliotekanauki.pl/articles/288364.pdf Link otwiera się w nowym oknie
Źródło:: Inżynieria Rolnicza; 2006, R. 10, nr 2 (77), 2 (77); 255-261
1429-7264
Pojawia się w:: Inżynieria Rolnicza
Opis:: Celem pracy było zbadanie wpływu parametrów aglomeracji nawilżeniowej poprzez mieszanie (laboratoryjny mieszalnik lemieszowo-płużący Lödige typ L5) na gęstość i porowatość otrzymywanych granulatów. Badano wpływ takich parametrów procesu jak: prędkość mieszadła impelerowego, czas mieszania, ilość i rodzaj cieczy nawilżającej. Zmiana poziomu zmiennych procesu miała bardziej znaczący wpływ na wymiar cząstek niż na gęstość nasypową, porowatość złoża czy gęstość rzeczywistą otrzymywanych aglomeratów.
The laboratory high-shear granulator (the Lödige Plughshare Mixer L5) was tested in a study investigating the influence of various granulation parameters (granulation time, the impeller speed and the amount of binder / water) on granules size, loose and tapped bulk densities, apparent particle density and porosity. Particles size was as a sensitive indicator of changes during granulation.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Soil physical properties affected by biochar addition at different plant phaenological phases. Part II
Autorzy:: Mako, A.
Barna, G.
Horel, A.
Tematy:: biochar
aggregate size distribution
hydraulic
conductivity
bulk density; Pokaż więcej
Data publikacji:: 2020
Powiązania:: https://bibliotekanauki.pl/articles/2082863.pdf Link otwiera się w nowym oknie
Źródło:: International Agrophysics; 2020, 34, 1; 1-7
0236-8722
Pojawia się w:: International Agrophysics
Opis:: A great emphasis has been placed on biochar addition to soils to improve its physical, chemical, and biological properties in recent times in order to achieve improved crop growth and yields. The present study explored to soil physical changes through different plant growth stages caused by biochar addition to silt loam soil in a pot-experiment. Our research focused on changes in soil bulk density, aggregate size distribution, and saturated hydraulic conductivity. The soils were amended with different amounts of biochars (control with 0, BC0.5 with 0.5%, BC2.5 with 2.5%, and BC5.0 with 5.0% biochar, by weight). Capsicum annuum L. were planted at a two-four leaf stage. Soil samples were taken at 6, 10 and 12 weeks after planting. The biochar amendment resulted in a significant decrease in soil bulk density values. Soil saturated hydraulic conductivity values ranged between 5.5 and 7.9 times higher for all treatments compared to the controls.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Impact of agricultural use on chosen soil properties
Autorzy:: Braun, Barbara
Tematy:: agricultural use
soil reaction
bulk density
organic matter; Pokaż więcej
Data publikacji:: 2008-06-01
Powiązania:: https://bibliotekanauki.pl/articles/2029783.pdf Link otwiera się w nowym oknie
Źródło:: Miscellanea Geographica. Regional Studies on Development; 2008, 13; 153-162
0867-6046
2084-6118
Pojawia się w:: Miscellanea Geographica. Regional Studies on Development
Opis:: Agricultural use may change soil. These changes may be observed by examining certain soil properties. In numerous cases of agricultural use, soil compaction may be observed at the depth of 25-35 cm. After many years of use, this may lead to the creation of a plough sole. On arable grounds, which are generally fertilized by minerals, a decrease in organic matter content and soil acidification are frequently observed. Each human activity leads to changes in the natural environment. In the case of agricultural use, the greatest changes take place in soil. Mechanization in agriculture and the wish to produce ever-greater amounts of crops influence changes in some soil properties. In a short time, changes in soil reaction, organic matter content or creation of a plough sole at the depth of 25-35 cm may observed.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Development of pedotransfer functions for predicting soil bulk density : a case study in Indonesian small island
Autorzy:: Yanti, Evi Dwi
Mulyono, Asep
Djuwansah, Muhammad Rahman
Narulita, Ida
Putra, Risandi Dwirama
Surinati, Dewi
Tematy:: bulk density
multiple linear regression
pedotransfer function
soil property; Pokaż więcej
Data publikacji:: 2021
Powiązania:: https://bibliotekanauki.pl/articles/2048512.pdf Link otwiera się w nowym oknie
Źródło:: Journal of Water and Land Development; 2021, 51; 181-187
1429-7426
2083-4535
Pojawia się w:: Journal of Water and Land Development
Opis:: Unlike many other countries, tropical regions such as Indonesia still lack publications on pedotransfer functions (PTFs), particularly ones dedicated to the predicting of soil bulk density. Soil bulk density affects soil density, porosity, water holding capacity, drainage, and the stock and flux of nutrients in the soil. However, obtaining access to a laboratory is difficult, time-consuming, and costly. Therefore, it is necessary to utilise PTFs to estimate soil bulk density. This study aims to define soil properties related to soil bulk density, develop new PTFs using multiple linear regression (MLR), and evaluate the performance and accuracy of PTFs (new and existing). Seven existing PTFs were applied in this study. For the purposes of evaluation, Pearson’s correlation (r), mean error (ME), root mean square error (RMSE), and modelling efficiency (EF) were used. The study was conducted in five soil types on Bintan Island, Indonesia. Soil depth and organic carbon (SOC) are soil properties potentially relevant for soil bulk density prediction. The ME, RMSE, and EF values were lower for the newly developed PTFs than for existing PTFs. In summary, we concluded that the newly developed PTFs have higher accuracy than existing PTFs derived from literature. The prediction of soil bulk density will be more accurate if PTFs are applied directly in the area that is to be studied.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Optimization of Packing Density of M30 Concrete with Steel Slag as Coarse Aggregate Using Fuzzy Logic
Autorzy:: Arivoli, M.
Malathy, R.
Tematy:: steel slag
characterisation
packing density
fuzzy system
compressive strength
bulk density; Pokaż więcej
Data publikacji:: 2017
Powiązania:: https://bibliotekanauki.pl/articles/353804.pdf Link otwiera się w nowym oknie
Źródło:: Archives of Metallurgy and Materials; 2017, 62, 3; 1903-1913
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Opis:: Concrete plays a vital role in the design and construction of the infrastructure. To meet the global demand of concrete in future, it is becoming a challenging task to find suitable alternatives to natural aggregates. Steel slag is a by-product of steel making process. The steel slag aggregates are characterized by studying particle size and shape, physical and chemical properties, and mechanical properties as per IS: 2386-1963. The characterization study reveals the better performance of steel slag aggregate over natural coarse aggregate. M30 grade of concrete is designed and natural coarse aggregate is completely replaced by steel slag aggregate. Packing density of aggregates affects the characteristics of concrete. The present paper proposes a fuzzy system for concrete mix proportioning which increases the packing density. The proposed fuzzy system have four sub fuzzy system to arrive compressive strength, water cement ratio, ideal grading curve and free water content for concrete mix proportioning. The results show, the concrete mix proportion of the given fuzzy model agrees with IS method. The comparison of results shows that both proposed fuzzy system and IS method, there is a remarkable increase in compressive strength and bulk density, with increment in the percentage replacement of steel slag.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Comparison of different models for predicting soil bulk density.Case study – Slovakian agricultural soils
Autorzy:: Makovníková, Jarmila
Širáň, Miloš
Houšková, Beata
Pálka, Boris
Jones, Arwyn
Tematy:: soil bulk density
pedotransfer function
texture
soil carbon content; Pokaż więcej
Data publikacji:: 2017
Powiązania:: https://bibliotekanauki.pl/articles/972829.pdf Link otwiera się w nowym oknie
Źródło:: International Agrophysics; 2017, 31, 4; 491-498
0236-8722
Pojawia się w:: International Agrophysics
Opis:: Soil bulk density is one of the main direct indicators of soil health, and is an important aspect of models for determining agroecosystem services potential. By way of applying multi-regression methods, we have created a distributed prediction of soil bulk density used subsequently for topsoil carbon stock estimation. The soil data used for this study were from the Slovakian partial monitoring system-soil database. In our work, two models of soil bulk density in an equilibrium state, with different combinations of input parameters (soil particle size distribution and soil organic carbon content in %), have been created, and subsequently validated using a data set from 15 principal sampling sites of Slovakian partial monitoring system-soil, that were different from those used to generate the bulk density equations. We have made a comparison of measured bulk density data and data calculated by the pedotransfer equations against soil bulk density calculated according to equations recommended by Joint Research Centre Sustainable Resources for Europe. The differences between measured soil bulk density and the model values vary from -0.144 to 0.135 g cm-3 in the verification data set. Furthermore, all models based on pedotransfer functions give moderately lower values. The soil bulk density model was then applied to generate a first approximation of soil bulk density map for Slovakia using texture information from 17 523 sampling sites, and was subsequently utilised for topsoil organic carbon estimation.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Physicochemical properties of spray dried honey preparations
Właściwości ﬁzyko-chemiczne preparatów miodowych suszonych rozpyłowo
Autorzy:: Samborska, K.
Bienkowska, B.
Tematy:: honey preparation
physicochemical property
spray drying
bulk density
hygroscopicity; Pokaż więcej
Data publikacji:: 2013
Powiązania:: https://bibliotekanauki.pl/articles/798457.pdf Link otwiera się w nowym oknie
Źródło:: Zeszyty Problemowe Postępów Nauk Rolniczych; 2013, 575
0084-5477
Pojawia się w:: Zeszyty Problemowe Postępów Nauk Rolniczych
Opis:: The aim of work was to characterise the physical and chemical properties of spray dried honey preparations and the changes in these properties during storage. Spray drying was performed at inlet air temperature 160 and 200°C, atomising disk speed 32 000 and 38 000 rpm, with the use of two types of carriers: dextrin and maltodextrin. The resulting powders had the desirable physical properties: low water content and activity, complete solubility and low cohesiveness. The powders produced with the use of dextrin had higher hygroscopicity and poorer solubility, they were also characterised by the highest water absorption during storage. Powders obtained with the use of reduced atomisation speed were the most stable in terms of water absorption and the changes of hygroscopicity during storage. Solubility of all powders was stable during storage.
Celem pracy było określenie właściwości ﬁzycznych i chemicznych preparatów miodowych suszonych rozpyłowo oraz zmiany tych właściwości w czasie przechowywania. Suszenie rozpyłowe przeprowadzono przy temperaturze powietrza wlotowego 160 do 200°C, szybkość obrotowa dysku rozpylającego wynosiła 32 000 i 38 000 obrotów na minutę, użyto dwóch rodzajów nośników: dekstrynę i maltodekstrynę. Otrzymane proszki miały pożądane właściwości ﬁzyczne: niską zawartość i aktywność wody, całkowitą rozpuszczalność i niską spójność. Proszki wytworzone z wykorzystaniem dekstryny miały wyższą higroskopijność i gorszą rozpuszczalność, charakteryzowały się najwyższą ilością wchłoniętej wody w czasie przechowywania. Proszki otrzymane z wykorzystaniem zmniejszonej szybkości obrotowej dysku rozpylającego były bardziej stabilne pod względem absorpcji wody i zmiany higroskopijności podczas przechowywania. Rozpuszczalność wszystkich proszków była stabilna w czasie przechowywania.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Biochar and Biochar with N Fertilizer Impact on Soil Physical Properties in a Silty Loam Haplic Luvisol
Autorzy:: Horák, Ján
Šimanský, Vladimír
Igaz, Dušan
Tematy:: biochar
soil moisture
soil temperature
bulk density
N fertilization; Pokaż więcej
Data publikacji:: 2019
Powiązania:: https://bibliotekanauki.pl/articles/125328.pdf Link otwiera się w nowym oknie
Źródło:: Journal of Ecological Engineering; 2019, 20, 7; 31-38
2299-8993
Pojawia się w:: Journal of Ecological Engineering
Opis:: Recently, a lot of studies focused on the effects of biochar application to agricultural soils and its influence on the soil properties. However, only limited information is available on the simultaneous impact of N-fertilizer combined with biochar to soil physical propersies such as: soil moisture, soil temperature, bulk density and waterfilled pore space. Therefore, the aim of this study was to evaluate the changes in the soil physical properties of a silty loam Haplic Luvisol affected by the biochar application and its combination with N fertilizer during the years 2014–2016 (Experimental site of SUA-Nitra, Dolná Malanta, Slovakia). The field experiment was carried out in 2014 with different biochar application doses (0, 10 and 20 t ha-1) and different rate of N fertilization (0, 1st and 2nd level of N fertilization). The results showed that the both biochar amendment and biochar with N fertilizer increased the soil moisture in the range of 1 to 15%, on average. The higher rate of biochar resulted in higher soil moisture in all treatments with biochar in the following order B0 (14.9) < B10 (15.1) < B20 (16.2) as well as in biochar in combination with N fertilization: B0N1 (14.6) < B10N1 (15.7) < B20N1 (16.2) as well as B0N2 (14.8) < B10N2 (15.8) < B20N2 (16.0) during the years of 2014–2016. A positive trend of water-filled pore space increase by the time in all studied treatments was observed. No significant changes in the average soil temperature were observed between the biochar and biochar with N fertilization treatments during the growing seasons of individual years. The higher rate of biochar resulted in lower soil bulk density in all treatments with biochar in combination with N fertilization in the following order: B0N1 (1.49) > B10N1 (1.47) > B20N1 (1.44) as well as B0N2 (1.51) > B10N2 (1.47) > B20N2 (1.39) during years the studied period (2014–2016).
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Problem wykorzystania gęstości objętościowej gleby w ocenie jej zagęszczenia
The problem of the use of bulk density of the soil in assessing its compaction
Autorzy:: Błażejczak, D.
Dawidowski, J. B.
Tematy:: gleba
ocena
zagęszczenie
gęstość objętościowa
soil
assessment
compaction
bulk density; Pokaż więcej
Data publikacji:: 2013
Powiązania:: https://bibliotekanauki.pl/articles/337261.pdf Link otwiera się w nowym oknie
Źródło:: Journal of Research and Applications in Agricultural Engineering; 2013, 58, 1; 17-20
1642-686X
2719-423X
Pojawia się w:: Journal of Research and Applications in Agricultural Engineering
Opis:: Celem pracy było dokonanie analizy problemu wykorzystywania gęstości objętościowej gleby w ocenie warunków rozwoju roślin i oddziaływania kół pojazdów i maszyn rolniczych na glebę. Zwrócono uwagę na fakt, że stosowanie gęstości objętościowej gleby do tych celów niesie za sobą wiele niewiadomych, utrudniających interpretację otrzymanych wyników oznaczeń. Omówiono problem oceny zagęszczenia gleby za pomocą: optymalnej gęstości objętościowej, krytycznej gęstości objętościowej i naturalnej gęstości objętościowej. Stwierdzono, że gęstość objętościowa gleby jest wskaźnikiem uwikłanym różnymi zależnościami, które modyfikują jej znaczenie jako kryterium różnego rodzaju ocen stanu gleby. W takich uwarunkowaniach ocena zagęszczenia gleby powinna także zawierać co najmniej następujące informacje: gatunek rośliny, wilgotność gleby, grupa granulometryczna gleby oraz sposób pobierania próbek gleby.
The aim of this study was to analyze the problem of soil bulk density used in the evaluation of conditions for plant growth and the assessment of the impact of vehicle wheels and machinery on the ground. Attention was paid to the fact that applying of the bulk density of the soil for such goals, carries a lot of unknowns, hampering the interpretation of the results of determinations. The problem of soil compaction assessment was discussed by: optimum bulk density, critical bulk density and natural bulk density. It was found that the bulk density of the soil is entangled with various relationships that modify its use as the criterion of the assessment of soil condition. Therefore soil compaction assessment should also include at least the following information: name of the plant, soil water content, name of soil textural group and description of soil sampling.
Dostawca treści:: Biblioteka Nauki

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