Resistência do solo à penetração e desenvolvimento do sistema radicular do milho (Zea mays) sob diferentes sistemas de manejo em um Latossolo Roxo

Filho, João Tavares; Barbosa, Graziela Moraes de Césare; Guimarães, M. F.; Fonseca, Inês Cristina de Batista

doi:10.1590/s0100-06832001000300022

Cited by 71 publications

(68 citation statements)

References 19 publications

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“…In the MCH system, the RP values were highest in the layer 0.40-0.55 m, with values above 4.0 MPa, classified as high and very high, exceeding the critical level (Tavares Filho et al, 2001;Llanillo et al, 2006). However, even though the values were highest in this layer, no significant resistance to sugarcane root growth was observed in these systems, which would cause a restrictive effect to yield increases.…”

Section: Resultsmentioning

confidence: 87%

Physical properties of a rhodic haplustox under two sugarcane harvesting systems

Machado

Telles²,

Filho

et al. 2010

Rev. Bras. Ciênc. Solo

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SUMMARYThis study had the purpose of evaluating the effects of two management types of sugarcane: harvesting of burnt cane (BCH) and mechanized harvesting of unburnt green cane (MCH), on some soil physical properties of a dystrophic Rhodic Haplustox. The data were then compared with results for the same soil type under native forest. A completely randomized design was used, with three treatments and 20 replications. The following characteristics were determined: organic matter, aggregate stability, soil bulk density, and porosity at depths of 0-0.20 m and soil penetration resistance. After 15 years of cultivation, there were some alterations in the soil under cane burnt before harvesting, evidenced by a drop in the weighted average diameter of stable aggregates in water and increased soil bulk density. Significant changes were also detected in total porosity and pore distribution under both harvesting systems. Critical values for penetration resistance were observed in the area under mechanized sugar cane harvesting, with a value of 4.5 MPa in the 40-55 cm layer. This value is considered high and could indicate compaction and restriction of root growth. Soil properties under the green cane (unburned) management system were closest to those of the soil under native forest.Index terms: Saccharum officinarum, soil bulk density, porosity, soil penetration resistance, soil aggregate stability.(

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Section: Resultsmentioning

confidence: 87%

Physical properties of a rhodic haplustox under two sugarcane harvesting systems

Machado

Telles²,

Filho

et al. 2010

Rev. Bras. Ciênc. Solo

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“…Assim, são necessários mais estudos sobre a viabilidade do cultivo de batata-doce sob preparo reduzido do solo, visto que a prática do plantio direto em longo período de tempo favorece os atributos físicos do solo, tornando-os mais adequados ao desenvolvimento vegetal que o plantio convencional, conforme verificado por Tavares Filho et al (2001), em latossolo vermelho argiloso, com plantio direto sendo realizado há mais de 20 anos.…”

Section: Resultsunclassified

Produtividade da cultura da batata-doce em diferentes sistemas de preparo do solo

2013

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ResumoTrabalhos sobre preparo reduzido em solos cultivados com raízes e tubérculos são escassos e controversos. Este trabalho objetivou avaliar e comparar a produtividade de raízes tuberosas de plantas de batata-doce cultivadas em argissolo vermelho-amarelo sob preparo convencional (aração seguida de gradagem niveladora e posterior levantamento de leiras com sulcador) e sob preparo reduzido com manutenção de palhada superficial (sem revolvimento do solo, exceto nas linhas de plantio). O delineamento experimental foi em blocos ao acaso, em esquema de parcelas subdivididas. As parcelas principais corresponderam aos tratamentos preparo convencional (com confecção de leiras) e preparo reduzido, e as subparcelas, às quatro épocas de coleta: 90, 120, 150 e 180 dias após plantio. Foram avaliadas as características: produtividades total e comercial, números de raízes tuberosas total e comercial, e massa de matéria fresca individual média das raízes tuberosas consideradas comerciais. A cultura da batata-doce apresentou produtividades total e comercial de raízes tuberosas 68 e 75% superiores no plantio convencional, respectivamente, em relação ao preparo reduzido, em função de maiores números total e comercial de raízes tuberosas em solo preparado de maneira convencional. Não houve diferença entre os manejos de solo quanto à massa de matéria fresca individual de raízes tuberosas. Concluindo, o preparo convencional do solo é mais adequado ao cultivo da batata-doce.Palavras-chave: Ipomoea batatas, conservação do solo, preparo reduzido, raiz tuberosa. Sweet potato yield under different soil managements AbstractStudies about reduced tillage in soil cultivated with roots and tubers are rare and controversial. This study aimed to assess and compare the sweet potato tuberous roots yield in an alfisol type soil managed with conventional tillage (plowing followed by leveling and making mounds) and reduced tillage with straw on the soil surface (cultivated only along the rows). The experimental design was in randomized blocks in split-plot scheme. The principal plots corresponded to conventional tillage (with mounds) and reduced tillage, and the subplots to four collect periods: 90, 120, 150 and 180 days after planting. The characteristics evaluated were: total and commercial yields, numbers of total and commercial tuberous roots, and commercial tuberous roots individual fresh mass. Sweet potato crop had total and commercial tuberous roots yields around 68 and 75% higher in conventional tillage, respectively, than in reduced tillage. This response was caused by the high numbers of total and commercial roots in soil under conventional tillage. There was no difference between the soil management on tuberous roots individual fresh mass. As conclusion, the conventional tillage is better to the sweet potato crop.

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“…There was no alteration in the soil structure, with predominance of compact, low porosity units (Δ), with a predominantly cracked (F) (50 %) structure in both profiles, be it sole maize or maize/jack bean intercropping (Figure 2). When evaluating resistance to maize root penetration in a red clay Oxisol (Latossolo Roxo argiloso), Tavares Filho et al (2001) found a compact layer caused by the use of heavy machinery between the volumes of loose (L) and continuously compact (CΔ) soil, which hampered root penetration. Thus, according to these authors, the structural modifications seem to be more restrictive for the root system development in the conventional system, due to the presence of the CΔ structure, which characterizes a very compact soil volume.…”

Section: Resultsmentioning

confidence: 99%

Morphostructural characterization of soil conventionally tilled with mechanized and animal traction with and without cover crop

Ralisch

Almeida

Silva

et al. 2010

Rev. Bras. Ciênc. Solo

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SUMMARYThe structural stability and restructuring ability of a soil are related to the methods of crop management and soil preparation. A recommended strategy to reduce the effects of soil preparation is to use crop rotation and cover crops that help conserve and restore the soil structure. The aim of this study was to evaluate and quantify the homogeneous morphological units in soil under conventional mechanized tillage and animal traction, as well as to assess the effect on the soil structure of intercropping with jack bean (Canavalia ensiformis L.). Profiles were analyzed in April of 2006, in five counties in the Southern-Central region of Paraná State (Brazil), on family farms producing maize (Zea mays L.), sometimes intercropped with jack bean. The current structures in the crop profile were analyzed using Geographic Information Systems (GIS) and subsequently principal component analysis (PCA) to generate statistics. Morphostructural soil analysis showed a predominance of compact units in areas of high-intensity cultivation under mechanized traction. The cover crop did not improve the structure of the soil with low porosity and compact units that hamper the root system growth. In areas exposed to animal traction, a predominance of cracked units was observed, where roots grew around the clods and along the gaps between them.Index terms: soil tillage, cultural profile, morphological homogeneous units, structural recovering.(

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Resistência do solo à penetração e desenvolvimento do sistema radicular do milho (Zea mays) sob diferentes sistemas de manejo em um Latossolo Roxo

Cited by 71 publications

References 19 publications

Physical properties of a rhodic haplustox under two sugarcane harvesting systems

Physical properties of a rhodic haplustox under two sugarcane harvesting systems

Produtividade da cultura da batata-doce em diferentes sistemas de preparo do solo

Morphostructural characterization of soil conventionally tilled with mechanized and animal traction with and without cover crop

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