Impact of Intensive Forest Management Practices on the Bulk Density of Lower Coastal Plain and Piedmont Soils

Abstract Trafficking during harvesting significantly increased soil bulk density to depths of 3 to 6 inches in areas outside of primary skid trails and 9 to 12 inches in primary skid trails. On the Coastal Plain site, bedding was effective in offsetting soil compaction in areas outside of primary skid trails, forming a new soil surface, 7 to 8 inches in height, over the surface trafficked during harvest. Bedding may not be so effective in the skid trails, because the original soil surface under the bed was so compacted that root growth may be inhibited. On the Piedmont site, disking was effective in restoring bulk density to preharvest levels in the upper 3 to 5 inches of soil, but soil compaction in the upper 3 to 9 inches of drum-chopped areas may result in reduced root growth, because of mechanical impedance.

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COTTON ROOT VOLUME AND ROOT DRY MATTER AS A FUNCTION OF HIGH SOIL BULK DENSITY AND SOIL WATER STRESS

Irriga ◽

10.15809/irriga.2008v13n4p476-491 ◽

2008 ◽

Vol 13 (4) ◽

pp. 476-491

Author(s):

Charles Duruoha ◽

Cassio Roberto Piffer ◽

Paulo Roberto Arbex Silva

Keyword(s):

Water Stress ◽

Root Growth ◽

Bulk Density ◽

Soil Water ◽

Soil Compaction ◽

Dry Matter ◽

Mechanical Impedance ◽

Field Capacity ◽

Soil Bulk Density ◽

Root Volume

COTTON ROOT VOLUME AND ROOT DRY MATTER AS A FUNCTION OF HIGH SOIL BULK DENSITY AND SOIL WATER STRESS Charles Duruoha1; Cassio Roberto Piffer2; Paulo Roberto Arbex Silva21United States Department of Agriculture (USDA-ARS), National Soil Dynamics Laboratory, Auburn, AL, U.S.A,. [email protected] 2Rural Engineering Departament, School of Agronomic Sciences, São Paulo State University, Botucatu, SP 1 ABSTRACT Soil compaction reduces root growth, affecting the yield, especially in the Southern Coastal Plain of the USA. Simulations of the root restricting layers in greenhouses are necessary to develop mechanisms which alleviate soil compaction problems. The selection of three distinct bulk densities based on the Standard Proctor Test is also an important factor to determine which bulk density restricts root penetration. This experiment was conducted to evaluate cotton (Gossypium hirsutum L.) root volume and root dry matter as a function of soil bulk density and water stress. Three levels of soil density (1.2, 1.4, and 1.6 g cm-3), and two levels of water content (70 and 90% of field capacity) were used. A completely randomized design with four replicates in a 3x2 factorial pattern was used. The results showed that mechanical impedance affected root volume positively with soil bulk density of 1.2 and 1.6 g cm-3, enhancing root growth (P>0.0064). Soil water content reduced root growth as root and shoot growth was higher at 70% field capacity than that at 90% field capacity. Shoot growth was not affected by the increase in soil bulk density and this result suggests that soil bulk density is not a good indicator for measuring mechanical impedance in some soils. KEY WORDS: soil density, water stress, root growth. DURUOHA, C.; PIFFER, C. R.; SILVA, P. R. A. VOLUME E MATÉRIA SECA RADICULAR DE ALGODÃO EM FUNÇÃO DA DENSIDADE DO SOLO ELEVADA E DO ESTRESSE HÍDRICO 2 RESUMO A compactação do solo reduz o crescimento radicular e, conseqüentemente, afeta a produção, especialmente no sudoeste do EUA. Simulações de camadas de restrição de raízes em casa de vegetação são necessárias para desenvolver mecanismos que reduzam problemas de compactação dos solos. A seleção de três diferentes densidades de solo baseadas no ensaio de Proctor é também um fator importante para determinar qual densidade restringe a penetração da raiz. O presente trabalho foi realizado para avaliar o volume e matéria seca radicular em função da densidade do solo e da disponibilidade hídrica em algodão (Gossypium hirsutum L.). Foram utilizados três níveis de densidade do solo (1,2; 1,4 e 1,6 g.cm-3) e dois níveis de teor de água no solo (70 e 90% da capacidade de campo). Os tratamentos foram inteiramente casualizados com quatro repetições em arranjo fatorial (3 x 2). Os resultados mostraram que o impedimento mecânico afetou o volume radicular com densidade do solo de 1,2 a 1,6 g.cm-3, proporcionando aumento do crescimento radicular (P>0,0064). A compactação subsuperficial restringiu a matéria seca radicular com densidade do solo de 1,2 cm.cm-3, aumentando a quantidade de matéria seca radicular na camada compactada (P<0,0291). O teor de água reduziu o crescimento radicular onde, na capacidade de campo de 70 %, houve aumento de raízes e da parte aérea, em relação à capacidade de campo de 90%. O crescimento da parte aérea não foi afetado pela densidade do solo, este resultado sugere que a densidade do solo não é um bom indicador de impedimento mecânico em alguns solos. UNITERMOS: densidade do solo, estresse hídrico, crescimento radicular.

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WATER TRANSPORT AND GROWTH OF CASHEW (Anacardium occidentale L.) UNDER SOIL MECHANICAL IMPEDANCE

Jurnal Penelitian Tanaman Industri ◽

10.21082/littri.v21n3.2015.117-124 ◽

2016 ◽

Vol 21 (3) ◽

pp. 117

Author(s):

JOKO PITONO ◽

TSUDA MAKOTO ◽

YOSHIHIKO HIRAI

Keyword(s):

Root Growth ◽

Bulk Density ◽

Water Transport ◽

Mechanical Impedance ◽

Soil Bulk Density ◽

Hydraulic Conductance ◽

Anacardium Occidentale ◽

Specific Response ◽

Root Area ◽

Four Levels

ABSTRACTThe ability to adapt to soil mechanical impedance was considered to support cashew growing in drought prone areas, since those areas are sometimes aggravated by problem on soil mechanical impedance. The response of water transport and growth under soil mechanical impedance was evaluated at two productive cashew accessions. Two cashew accessions, A3-1, that adapt well to drought stress, and a local accession Pangkep, and four levels of soil bulk densities of 0.75 g cm-3, 0.90 g cm-3, 1.00 g cm-3 and 1.24 g cm-3 under sufficient soil moisture conditions, were arranged in factorially completely randomized design with five replications. The response of shoot and root growth, transpiration and hydraulic conductance were evaluated. The results showed that the accession of A3-1 indicated a better to maintain root growth under soil mechanical impedance that produced thick root/total root length ratio and xylem area/transvesal root area ratio more than Pangkep. On the other hand, A3-1 was faster in reducing leaf area than Pangkep when subjected to increased level of soil bulk density treatments. Although the hydraulic conductance was not varied among the cashew accessions and had not a specific response trend to soil bulk density treatments, however, the increase of diurnal transpiration induced by increased level of soil bulk density treatment in A3-1 was higher than it in Pangkep. It is suggested that the ability to regulate the root and shoot growth and water transport under soil mechanical impedance condition was better in A3-1 than in Pangkep. Moreover, it might be a part attribute of drought tolerance on A3-1 accession.Keywords: cashew, soil mechanical impedance, growth, water transport ABSTRAKTransportasi Air dan Pertumbuhan Jambu Mente (Anacardium occidentale L.) pada Berbagai Hambatan Mekanik TanahKemampuan adaptasi terhadap hambatan mekanik tanah diper- kirakan membantu pengembangan jambu mente di wilayah berlahan kering, mengingat kondisi wilayah tersebut sering diperparah oleh masalah hambatan mekanik tanah. Respon transportasi air tanaman dan pertum- buhan terhadap hambatan mekanik tanah dievaluasi pada dua aksesi jambu mente. Dua aksesi jambu mete, A3-1 yang adaptif terhadap stres kekeringan dan aksesi lokal, Pangkep, serta 4 level padatan tanah 0.75 g.cm-3, 0.90 g.cm-3, 1.00 g.cm-3, dan 1.24 g.cm-3 dengan kondisi lengas tanah dijaga selalu cukup, disusun dalam rancangan faktorial acak lengkap dengan lima ulangan. Respon pertumbuhan akar dan tajuk, transpirasi, dan daya hantar air tanaman dievaluasi. Hasil penelitian menunjukkan bahwa A3-1 lebih mampu menjaga pertumbuhan akar pada kondisi hambatan mekanik tanah dengan nilai rasio panjang akar tebal/panjang total akar dan rasio luas xylem/luas melintang akar lebih lebih besar daripada Pangkep. Pada sisi lain, A3-1 mengurangi luas daun lebih cepat dibanding Pangkep saat diberikan kenaikan perlakuan berat isi tanah. Meskipun tidak ada perbedaan daya hantar air tanaman di antara kedua aksesi dan tidak adanya pola respon spesifik terhadap perlakuan padatan tanah, namun terjadi kenaikan transpirasi harian lebih besar pada A3-1 daripada Pangkep. Hasil ini mengindikasikan bahwa kemampuan A3-1 mengatur pertumbuhan dan transportasi air saat mengalami hambatan mekanik tanah lebih baik daripada Pangkep. Hal ini mungkin merupakan bagian dari sifat toleransi terhadap kekeringan pada aksesi A3-1.Kata kunci: jambu mente, hambatan mekanik tanah, pertumbuhan, transportasi air

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Impacts of harvesting and postharvest treatments on soil bulk density, soil strength, and early growth of Pinus taeda in the Gulf Coastal Plain: a Long-Term Soil Productivity affiliated study

Canadian Journal of Forest Research ◽

10.1139/x05-248 ◽

2006 ◽

Vol 36 (3) ◽

pp. 601-614 ◽

Cited By ~ 17

Author(s):

Mason C Carter ◽

Thomas J Dean ◽

Ziyin Wang ◽

Ray A Newbold

Keyword(s):

Bulk Density ◽

Pinus Taeda ◽

Weed Control ◽

Tree Growth ◽

Coastal Plain ◽

Soil Compaction ◽

Soil Bulk Density ◽

Soil Strength ◽

Gulf Coastal Plain ◽

The Impact

At four sites in the Gulf Coastal Plain, mechanical whole-tree harvesting (MWT) removed more biomass and nutrients than hand-fell bole-only harvesting (HFBO). Soil compaction and loblolly pine (Pinus taeda L.) regeneration growth varied among sites. At one location, MWT increased soil bulk density by 0.1 Mg·m3, from 1.14 to 1.24 Mg·m3, with no effect on tree growth. At a second location, where bulk density increased by 0.1 Mg·m3, from 1.41 to 1.51 Mg·m3, pine growth was reduced significantly. Soil strength at 1520 cm depth increased by 0.30.5 MPa at both locations. However, where MWT reduced pine growth, herbaceous weed control mitigated the effect. Fertilization with N and P, where P was limiting, increased pine growth irrespective of other treatments. Where P was not limiting, addition of a complete fertilizer reduced the mitigating effect of weed control. Bedding reduced soil compaction without improving early tree growth; however, bedding was not tested on the two sites where soil compaction appeared to be at critical levels. Broadcast burning increased survival but reduced pine growth irrespective of harvesting method. Our results suggest that the impact of intensive management on site productivity varies among sites, is potentially accumulative, and is subject to change over time.

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ROOT VOLUME AND DRY MATTER OF PEANUT PLANTS AS A FUNCTION OF SOIL BULK DENSITY AND SOIL WATER STRESS.

Irriga ◽

10.15809/irriga.2008v13n2p170-181 ◽

2008 ◽

Vol 13 (2) ◽

pp. 170-181 ◽

Cited By ~ 1

Author(s):

Charles Duruoha ◽

Cassio Roberto Piffer ◽

Paulo Roberto Arbex Silva

Keyword(s):

Water Stress ◽

Root Growth ◽

Water Content ◽

Bulk Density ◽

Soil Water ◽

Soil Water Content ◽

Soil Compaction ◽

Field Capacity ◽

Soil Bulk Density ◽

Root Volume

ROOT VOLUME AND DRY MATTER OF PEANUT PLANTS AS A FUNCTION OF SOIL BULK DENSITY AND SOIL WATER STRESS. Charles Duruoha1; Cassio Roberto Piffer2; Paulo Roberto Arbex Silva21United States Department of Agriculture (USDA-ARS), National Soil Dynamics Laboratory, Auburn, AL - U.S.A., [email protected] de Engenharia Rural, Faculdade de Ciências Agronômicas, Universidade Estadual Paulista, Botucatu, São Paulo 1 ABSTRACT Soil compaction may be defined as the pressing of soil to make it denser. Soil compaction makes the soil denser, decreases permeability of gas and water exchange as well as alterations in thermal relations, and increases mechanical strength of the soil. Compacted soil can restrict normal root development. Simulations of the root restricting layers in a greenhouse are necessary to develop a mechanism to alleviate soil compaction problems in these soils. The selection of three distinct bulk densities based on the standard proctor test is also an important factor to determine which bulk density restricts the root layer. This experiment aimed to assess peanut (Arachis hypogea) root volume and root dry matter as a function of bulk density and water stress. Three levels of soil density (1.2, 1.4, and 1.6g cm-3), and two levels of the soil water content (70 and 90% of field capacity) were used. Treatments were arranged as completely randomized design, with four replications in a 3x2 factorial scheme. The result showed that peanut yield generally responded favorably to subsurface compaction in the presence of high mechanical impedance. This clearly indicates the ability of this root to penetrate the hardpan with less stress. Root volume was not affected by increase in soil bulk density and this mechanical impedance increased root volume when roots penetrated the barrier with less energy. Root growth below the compacted layer (hardpan), was impaired by the imposed barrier. This stress made it impossible for roots to grow well even in the presence of optimum soil water content. Generally soil water content of 70% field capacity (P<0.0001) enhanced greater root proliferation. Nonetheless, soil water content of 90% field capacity in some occasions proved better for root growth. Some of the discrepancies observed were that mechanical impedance is not a good indicator for measuring root growth restriction in greenhouse. Future research can be done using more levels of water to determine the lowest soil water level, which can inhibit plant growth. KEY WORDS: Soil compaction; water stress; soil bunk; root volume; root growth DURUOHA, C.; PIFFER, C. R.; SILVA, P. R. A. MATÉRIA SECA E VOLUME DE RAÍZES DE PLANTAS DE AMENDOIMEM FUNÇÃO DADENSIDADEE DO DÉFICIT DE ÁGUA DO SOLO. 2 RESUMO O conceito de compactação do solo não inclui apenas a redução do solo, mas também no resultante decréscimo em permeabilidade para trocas gasosas e água, assim como alterações em relação térmica e aumento na resistência mecânica do solo. Um solo compactado pode restringir o desenvolvimento radicular normal da planta. Simulações de camadas de restrição de raízes em casa de vegetação são necessárias para desenvolver mecanismos que reduzam problemas de compactação dos solos. A seleção de três diferentes densidades de solo, baseadas no ensaio de Proctor, é também um fator importante para determinar qual densidade restringe a penetração da raiz. O presente trabalho foi realizado para avaliar o volume e matéria seca radicular em função da densidade do solo e da disponibilidade hídrica em amendoim (Arachis hypogea). Foram utilizados três níveis de densidade do solo (1,2; 1,4 e1,6 gcm-3) e dois níveis de teor de água no solo (70 e 90% da capacidade de campo). Os tratamentos foram inteiramente casualizados com quatro repetições em arranjo fatorial (3 x 2). Os resultados sugerem que a produção de amendoim geralmente responde favoravelmente à compactação subsuperficial, na presença de impedância mecânica elevada. Este resultado claramente indica a habilidade da raiz em penetrar na camada de impedimento com menor densidade. O volume radicular não foi afetado pelo aumento da densidade do solo e esta impedância mecânica aumentou o volume radicular quando as raízes penetraram em barreiras com menor compactação. O crescimento radicular abaixo da camada compactada foi afetado pela barreira imposta. Esta compactação impossibilitou que as raízes crescessem mesmo na presença de teor de água ótimo. O teor de água de 70 % da capacidade de campo (P<0,0001) proporcionou maior proliferação radicular. Foi observado que a impedância mecânica não é um bom indicador para a avaliação da restrição de crescimento radicular no trabalho em casa de vegetação. UNITERMOS: compactação do solo, capacidade de campo e crescimento radicular.

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Tillage is Necessary in Re-establishing Peach Orchards

HortTechnology ◽

10.21273/horttech.4.1.66 ◽

1994 ◽

Vol 4 (1) ◽

pp. 66-67

Author(s):

D.M. Glenn ◽

J. Kotcon ◽

W.V. Welker

Keyword(s):

Bulk Density ◽

Tree Growth ◽

Soil Compaction ◽

Prunus Persica ◽

Growth Yield ◽

Soil Surface ◽

Bare Soil ◽

Soil Bulk Density ◽

Apple Orchard ◽

Peach Trees

Three soil management treatments (cultivation, herbicide, and killed sod) were established in the drive middle of a 10-year-old apple orchard removed the year prior to planting peaches. The cultivation and herbicide treatments used preplant tillage, leaving a bare soil surface, whereas the killed-sod system was untilled. Peach trees (Prunus persica L. Batsch) were planted, and growth, yield, and soil bulk density were measured after 3 years. There were no differences in tree growth or yield for the three treatments These results were contrary to published reports that the killed-sod system increased early tree growth. The lack of growth response in the killed-sod system was attributed to the high soil bulk density remaining from the previous orchard. We concluded that truck and tractor traffic in the drive middle causes severe soil compaction, which may limit root development. The soil compaction can only be moderated by tillage.

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Soil physical properties and sugarcane root growth in a red oxiso

Revista Brasileira de Ciência do Solo ◽

10.1590/s0100-06832012000100007 ◽

2012 ◽

Vol 36 (1) ◽

pp. 63-70 ◽

Cited By ~ 21

Author(s):

José Euripides Baquero ◽

Ricardo Ralisch ◽

Cristiane de Conti Medina ◽

João Tavares Filho ◽

Maria de Fátima Guimarães

Keyword(s):

Root Growth ◽

Physical Properties ◽

Bulk Density ◽

Management Practices ◽

Root Length Density ◽

Penetration Resistance ◽

Soil Bulk Density ◽

Soil Physical Properties ◽

Native Forest ◽

Growing Seasons

Sugarcane, which involves the use of agricultural machinery in all crop stages, from soil preparation to harvest, is currently one of the most relevant crops for agribusiness in Brazil. The purpose of this study was to investigate soil physical properties and root growth in a eutroferric red Oxisol (Latossolo Vermelho eutroférrico) after different periods under sugarcane. The study was carried out in a cane plantation in Rolândia, Paraná State, where treatments consisted of a number of cuts (1, 3, 8, 10 and 16), harvested as green and burned sugarcane, at which soil bulk density, macro and microporosity, penetration resistance, as well as root length, density and area were determined. Results showed that sugarcane management practices lead to alterations in soil penetration resistance, bulk density and porosity, compared to native forest soil. These alterations in soil physical characteristics impede the full growth of the sugarcane root system beneath 10 cm, in all growing seasons analyzed.

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Effects of Soil Compaction on Height Growth of a California Ponderosa Pine Plantation

Western Journal of Applied Forestry ◽

10.1093/wjaf/1.4.104 ◽

1986 ◽

Vol 1 (4) ◽

pp. 104-108 ◽

Cited By ~ 4

Author(s):

J. A. Helms ◽

C. Hipkin ◽

E. B. Alexander

Keyword(s):

Organic Carbon ◽

Bulk Density ◽

Sierra Nevada ◽

Pinus Ponderosa ◽

Ponderosa Pine ◽

Soil Compaction ◽

Soil Surface ◽

Surface Characteristics ◽

Soil Bulk Density ◽

Height Growth

Abstract An analysis was made of the extent to which observed variability in plantation height growth could be explained by variability in soil surface characteristics that are modified by harvesting and site preparation activities. The study was done in a 16-year-old ponderosa pine (Pinus ponderosa) plantation in the Sierra Nevada of California. Annual height growth of all 423 trees within a 0.48 ha area was measured together with soil bulk density, A-Horizon thickness, and shrub competition. Soil organic carbon and mineralizeable nitrogen were measured on a subsample of 72 trees. Trees in areas of highest bulk density grew 43% less at age 1 and 13% less at age 15 than those in areas of lowest bulk density. Annual shoot growth was markedly reduced for 4 consecutive years following 2 years of below-normal precipitation, especially in trees growing in soils of lowest bulk density. Bulk density, A-Horizon thickness, and shrub cover accounted for only 13 to 23% of variability in height growth of the 423-tree sample. These same variables, plus organic carbon and mineralizeable nitrogen, accounted for 31% of variability in height growth of the 72-tree sample. West. J. Appl. For. 1:104-108, Oct. 1986.

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The influence of forest site on rate and extent of soil compaction and profile disturbance of skid trails during ground-based harvesting

Canadian Journal of Forest Research ◽

10.1139/x00-041 ◽

2000 ◽

Vol 30 (8) ◽

pp. 1196-1205 ◽

Cited By ~ 95

Author(s):

J R Williamson ◽

W A Neilsen

Keyword(s):

Root Growth ◽

Soil Compaction ◽

Forest Type ◽

Soil Bulk Density ◽

Parent Material ◽

Forest Site ◽

Undisturbed Soil ◽

Soil Parent Material ◽

Wet Forests

Soil compaction has been considered a principal form of damage associated with logging, restricting root growth and reducing productivity. The rate and extent of soil compaction on skid trails was measured at six field locations covering a range of dry and wet forests. Data was collected for up to 21 passes of a laden logging machine. A similar extent of compaction, averaging 0.17 g·cm-3 increase in total soil bulk density (BD), was recorded for all field sites despite substantial site and soil differences. On average, 62% of the compaction in the top 10 cm of the soil occurred after only one pass of a laden logging machine. The environment under which soils had formed played a major role in determining the BD of the undisturbed soil. Compaction was strongly related to the original BD, forest type, and soil parent material. Soil strengths obtained in the field fell below levels found to restrict root growth. However, reduction in macropores, and the effect of that on aeration and drainage could reduce tree growth. On the wettest soils logged, machine forces displaced topsoils rather than causing compaction in situ. Recommended logging methods and implications for the development of sustainability indices are discussed.

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INFLUÊNCIA DA COMPACTAÇÃO E DO CULTIVO DE SOJA NOS ATRIBUTOS FÍSICOS E NA CONDUTIVIDADE HIDRÁULICA EM LATOSSOLO VERMELHO

Irriga ◽

10.15809/irriga.2003v8n3p242-249 ◽

2003 ◽

Vol 8 (3) ◽

pp. 242-249 ◽

Cited By ~ 1

Author(s):

Amauri Nelson Beutler ◽

José Frederico Centurion ◽

Cassiano Garcia Roque ◽

Zigomar Menezes de Souza

Keyword(s):

Hydraulic Conductivity ◽

Bulk Density ◽

Soil Compaction ◽

Soil Surface ◽

Total Porosity ◽

Soil Condition ◽

Agricultural Science ◽

Water Infiltration ◽

Loose Soil ◽

Physical Attributes

INFLUÊNCIA DA COMPACTAÇÃO E DO CULTIVO DE SOJA NOS ATRIBUTOS FÍSICOS E NA CONDUTIVIDADE HIDRÁULICA EM LATOSSOLO VERMELHO Amauri Nelson BeutlerJosé Frederico CenturionCassiano Garcia RoqueZigomar Menezes de SouzaDepartamento de Solos e Adubos, Faculdade de Ciências Agrárias e Veterinárias, Universidade Estadual Paulista, Jaboticabal, SP. CEP 14870-000. E-mail: [email protected], [email protected] 1 RESUMO Este estudo teve como objetivo determinar a influência da compactação e do cultivo de soja nos atributos físicos e na condutividade hidráulica de um Latossolo Vermelho de textura média. O experimento foi conduzido na Universidade Estadual Paulista – Faculdade de Ciências Agrárias e Veterinárias, Jaboticabal (SP). Os tratamentos foram: 0, 1, 2, 4 e 6 passadas de um trator, uma ao lado da outra perfazendo toda a superfície do solo, com quatro repetições. O delineamento experimental foi inteiramente casualizado para a condutividade hidráulica e, em esquema fatorial 5 x 2 para os atributos físicos. Foram coletadas amostras de solo nas faixas de profundidades de 0,02-0,05; 0,07-0,10 e 0,15-0,18 m, por ocasião da semeadura e após a colheita para determinação da densidade do solo, porosidade total, macro e microporosidade do solo. A condutividade hidráulica do solo foi determinada após a colheita. O tempo entre a semeadura e a colheita de soja foi suficiente para aumentar a compactação do solo apenas na condição de solo solto. A compactação do solo reduziu a condutividade hidráulica em relação a condição natural (mata) e a condição de solo solto, sendo que esta não foi reduzida, após a primeira passagem, com o aumento no número de passagens. UNITERMOS: Densidade do solo, porosidade do solo, infiltração de água, soja. BEUTLER, A. N.; CENTURION, J. F.; ROQUE, C. G.; SOUZA, Z. M. COMPACTION AND SOYBEAN GROW INFLUENCE ON PHYSICAL ATTRIBUTES AND HYDRAULIC CONDUCTIVITY IN RED LATOSSOL SOIL 2 ABSTRACT The purpose of this study was to determine the influence of compaction and soybean grow on physical attributes and hydraulic conductivity of a Red Latossol, medium texture soil. The experiment was carried out in the experimental farm at the Paulista State University – Agricultural Science College, Jaboticabal – São Paulo state. The treatments were 0, 1, 2, 4 and 6 side-by-side tractor strides on the soil surface with four replications. The experimental design was completely randomized for hydraulic conductivity and a 5 x 2 factorial design for soil physical attributes. Soil samples have been collected at 0.02-0.05, 0.07-0.10 and 0.15-0.18 m depth at sowing season and after harvest in order to determine soil bulk density, total porosity, macro and micro porosity. Soil hydraulic conductivity was determined after harvest. The time period between the soybean sowing and harvesting was enough to increase soil compaction only in loose soil condition. Soil compaction reduced hydraulic conductivity compared to the natural (forest) and loose soil condition KEYWORDS: Bulk density, soil porosity, water infiltration, soybean.

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