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| Registros recuperados: 45 | |
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| Beutler,Amauri Nelson; Centurion,José Frederico. |
| Soil compaction and fertilization affect soybean development. This study evaluated the effects of soil compaction and fertilization on soybean (Glycine max cv. Embrapa 48) productivity in a Typic Haplustox under field conditions in Jaboticabal, SP, Brazil. A completely randomized design with a 5 x 2 factorial layout (compaction vs. fertilization), with four replications in each treatment, was employed. Each experimental unit (replicate) consisted of a 3.6 m² useful area. After the soil was prepared by cultivation, an 11 Mg tractor passed over it a variable number of times to create five levels of compaction. Treatments were: T0= no compaction, T1= one tractor pass, T2= two, T4= four, and T6= six passes, and no fertilizer and fertilizer to give soybean... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Bulk density; Penetration resistance; Fertilizer; Yield. |
| Ano: 2004 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000600010 |
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| Beutler,Amauri Nelson; Centurion,José Frederico; Centurion,Maria Aparecida Pessoa da Cruz; Freddi,Onã da Silva; Sousa Neto,Eurico Lucas de; Leonel,Cristian Luarte; Silva,Álvaro Pires da. |
| Excessive traffic on the soil may affect soybean development. This research was carried out to evaluate soybean root development and grain yield under compacted soil, in an Oxisol. The following traffic treatments were used: T0 = no traffic; T1* = 1 passage of a 4 t tractor; and, T1, T2, T4 and T6, respectively for 1, 2, 4 and 6 passages of an 11 t tractor on the same location, each besides the other. After compaction, soybean [Glycine max cv. MG/BR 46 (Conquista)] was cultivated. The experiment was arranged in a completely randomized design, with six compaction levels and four replicates (plots of 9.0 m²). Undisturbed soil samples were collected in the layers 0.03-0.06, 0.08-0.11, 0.15-0.18 and 0.22-0.25 m, for physical analyses. Root analyses were... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Glycine max; Machine traffic; Bulk density; Penetration resistance. |
| Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000600008 |
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| Pedrotti,Alceu; Pauletto,Eloy Antonio; Crestana,Silvio; Cruvinel,Paulo Estevão; Vaz,Carlos Manoel Pedro; Naime,João de Mendonça; Silva,Alvaro Macedo da. |
| Computerized tomography (CT) is an important tool in Soil Science for noninvasive measurement of density and water content of soil samples. This work aims to describe the aspects of sample size adequacy for Planosol (Albaqualf) and to evaluate procedures for statistical analysis, using a CT scanner with a 241Am source. Density errors attributed to the equipment are 0.051 and 0.046 Mg m-3 for horizons A and B, respectively. The theoretical value for sample thickness for the Planosol, using this equipment, is 4.0 cm for the horizons A and B. The ideal thickness of samples is approximately 6.0 cm, being smaller for samples of the horizon B in relation to A. Alternatives for the improvement of the efficiency analysis and the reliability of the results obtained... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Lowland; Albaqualf; Bulk density; Compaction; Soil moisture. |
| Ano: 2003 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000400019 |
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| Schmitz,Daniela; Loss,Arcângelo; Oliveira,Bruno Salvador; Lovato,Paulo Emilio; Veiga,Milton da; Brunetto,Gustavo; Curmi,Pierre; Comin,Jucinei José. |
| Abstract The aim of this research was to evaluate the physical attributes of Cambisol in apple (Malus domestica Borkh. cv. Gala) orchard under different weed management systems in the state of Santa Catarina (SC), Brazil. The treatments were as follows: control (no weed management), chemical desiccation and mowing. We took samples of undisturbed soil at depths of 0-5, 5-10, 10-15 and 15-20 cm. We evaluated hydraulic conductivity (HC); bulk density (BD); soil penetration resistance (Pr); total porosity (TP), macropores (MaP), micropores (MiP); soil aggregation indices such as arithmetic and geometric mean diameter of air-dried and water-stable aggregates (AMDad, AMDws, GMDad, GMDws, respectively); aggregate stability index (ASIAMD and ASIGMD) and volumetric... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Bulk density; Chemical desiccation and mowing of weeds; Aggregate indices; Penetration resistance; Principal component analysis. |
| Ano: 2017 |
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-28122017000300414 |
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| Álvarez-Arteaga*,Gustavo; García-Fajardo,Belina; Orozco-Hernández,María Estela; Mireles-Lezama,Patricia; Contreras-Martínez,Julieta. |
| Abstract The loss of organic carbon stocks from the soil and their expulsion into the atmosphere due to the effect of anthropogenic activities must be understood as a problem that goes beyond the environmental to the social and economic context, with the soil degradation being just one of its many impacts. While the accumulation of carbon in the soil depends naturally on the interaction among a series of biotic and abiotic factors, management practices often cause the deterioration of its physical, chemical and biological properties, and, thus, increase the levels of mineralization and a reduction in carbon stocks. This research was undertaken in the municipality of San José del Rincón, State of Mexico, in volcanic soils under different conditions of soil... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Stocks; Bulk density; Organic material; Management practices; Forest soils. |
| Ano: 2017 |
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-28122017000100021 |
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| Mahmood-ul-Hassan, Muhammad; National Agricultural Research Centre; rafique, Eajaz; National Agricultural Research Centre; Rashid, Abdul; National Agricultural Research Centre. |
| A 5-year cotton–wheat rotation field experiment was conducted on two alkaline-calcareous soils to investigate the impact of integrated nutrient-management and crop-residue incorporation on soil physical and hydrological properties. The nutrient treatments were: T1–farmers' fertilizer use; T2–balanced nutrient management (recommended N, P, Zn. and B from mineral sources); T3–integrated nutrient management, same as T2, except that 75% N was applied from fertilizer and 25% as FYM; and T4 same as T2, except that every alternate year, wheat was substituted by Berseem green manure. All treatments were compared with and without crop residue incorporation. Soil organic matter (SOM) content in both the soils was significantly increased with T2, T3 and T4 as... |
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Palavras-chave: Cotton-wheat system; Crop-residue recycling; Integrated nutrient management; Bulk density; Water stable aggregate; Hydraulic conductivity. |
| Ano: 2012 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/14683 |
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| Fadeyibi, Adeshina. |
| This research was carried out to determine some physical, mechanical, mineral and proximate properties of miracle berry fruits (Synsepalum dulcificum L.) in the moisture range of 6.45− 9.73% (db). Physical properties including bulk density and terminal velocity were determined using standard methods. Mechanical properties including stiffness and deformation were determined using quasi-static compression analysis. Proximate and mineral compositions of the fruit including crude protein and calcium contents were determined using standard analytical methods. Results showed that the terminal velocity, stiffness, crude protein, calcium contents decreased generally with an increase in the moisture content (p < 0.05). The average values of the terminal... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Bulk density; Crude protein; Crude fibre; Mechanical properties; Miracle fruit. |
| Ano: 2021 |
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/6011 |
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| Altuntaş, Ebubekír. |
| In the study, effects of aminoethoxyvinylglycine (AVG) treatment and maturity stages on physico-mechanical and chemical properties of fruit of plum fruit (Prunus domestica cv. ‘President’) was investigated. The effect AVG doses for each maturity stage on geometric mean diameter and surface area of plum fruit was statistically significant. Geometric mean diameter and surface area were higher on 4 August harvest date than the other harvest dates. The effect AVG doses on the fruit volume and fruit mass of plum fruit were statistically significant for each maturity stage. While L*, b*, and C* color characteristics of plum fruit for all AVG treatments increased according to maturity stages. The effect of AVG treatments on the fruit removal force (FRF) and fruit... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Bulk density; Geometric mean diameter; Colour; Fruit removal force; SSC. |
| Ano: 2020 |
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/5674 |
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| Mohhamadi, Vahid; Abbaspour, Behnam; Sharifi, Seyed Davoud; Mirzabe, Amir Hossein. |
| Abstract: Information on physical properties of broiler chickens diets is not available in literatures and such information is important for design and construction of poultry equipments. Some physical properties of starter, grower and finisher diet of broiler chickens, namely: gravimetrical (bulk density, true density and porosity) and frictional properties (coefficient of friction filling angle of repose, empting angle of repose and pouring angle of repose) were studied. Effect of height of falling diets to the containers at 150, 250 and 350 mm and volume of the containers at 500, 600, 1,100 and 2,000 mL on bulk density and porosity of diets were studied. Results indicated that true density of the starter; grower and finisher diets were 1,442.574,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Broilers diet; Bulk density; True density; Coefficient of friction; Angle of repose. |
| Ano: 2014 |
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/2755 |
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| Domingues, Rafael; Pereira, André Belmont; Pires, Luiz Fernando; Schiebelbein, Luis Miguel; Barbosa, Eduardo Augusto Agnellos; Auler, André Carlos. |
| Beans crop is an agricultural staple largely consumed in Brazil because it is part of the basic food of the population. Such a crop is usually grown by small growers and turns out to be of a great social and economical importance. The aim of the current manuscript was to scrutinize the effect of soil water status on its physical attributes, such as bulk density, total porosity, macroporosity, microporosity, hydraulic conductivity under protected environment conditions on beans crop (Phaseolus vulgaris L.). The effect of the soil physical attributes on the biological response of the plants was also investigated. The experiment was installed in March of 2016 in a greenhouse. The experimental design was completely randomized in a factorial scheme with four... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Agronomy; Agrometeorology; Soil Physics; Irrigation Science Phaseolus vulgaris L; Hydraulic conductivity; Soil moisture; Macroporosity; Microporosity; Bulk density. |
| Ano: 2018 |
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/4585 |
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| Registros recuperados: 45 | |
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