Optimal soil physical quality inferred through structural regression and parameter interactions

Reynolds, W. D.; Drury, C. F.; Yang, Xueming; Tan, C. S.

doi:10.1016/j.geoderma.2008.06.017

Cited by 152 publications

(154 citation statements)

References 47 publications

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“…However, with the use of WP4-T in estimating PWP, similarly to when using the FC6 or IP in the FC estimation, substantially higher AWC values are achieved, changing the classification of these Oxisols regarding water retention. These findings are of great importance to clarify that the methods for estimating AWC can result in very different interpretations of the plant-available water holding capacity, reflecting on practical applications, particularly when the value of AWC 0.20 m 3 m -3 or 20 mm water/10 cm soil were considered as optimal for maximum growth rate and functionality of plant roots in fine-textured soils (Reynolds et al, 2008).…”

Section: Resultsmentioning

confidence: 98%

Plant-available soil water capacity: estimation methods and implications

Silva

Silva²,

Oliveira³

et al. 2014

Rev. Bras. Ciênc. Solo

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SUMMARYThe plant-available water capacity of the soil is defined as the water content between field capacity and wilting point, and has wide practical application in planning the land use. In a representative profile of the Cerrado Oxisol, methods for estimating the wilting point were studied and compared, using a WP4-T psychrometer and Richards chamber for undisturbed and disturbed samples. In addition, the field capacity was estimated by the water content at 6, 10, 33 kPa and by the inflection point of the water retention curve, calculated by the van Genuchten and cubic polynomial models. We found that the field capacity moisture determined at the inflection point was higher than by the other methods, and that even at the inflection point the estimates differed, according to the model used. By the WP4-T psychrometer, the water content was significantly lower found the estimate of the permanent wilting point. We concluded that the estimation of the available water holding capacity is markedly influenced by the estimation methods, which has to be taken into consideration because of the practical importance of this parameter.Index terms: field capacity, permanent wilting point, soil water retention curve modeling, Oxisol, land use planning.( RESUMO: CAPACIDADE DE ÁGUA DISPONÍVEL NO SOLO PARA AS PLANTAS: MÉTODOS DE ESTIMATIVA E IMPLICAÇÕESA capacidade de água disponível no solo para as plantas é definida como o conteúdo de água entre a capacidade de campo e o ponto de murcha permanente e tem vasta aplicação prática no planejamento do uso da terra. Em um perfil de Latossolo representativo da região do Cerrado, objetivaram-se estudar e comparar métodos de estimativa para o ponto de murcha permanente, empregando os aparelhos de psicrômetro WP4-T e a câmara de Richards, utilizando amostras com e sem preservação da estrutura, bem como para a capacidade de campo, estimando-a pela umidade do solo submetido às tensões 6, 10 e 33 kPa, e pelo ponto de inflexão da curva de retenção de água calculado nos modelos de van Genuchten e polinomial cúbico. Verificou-se que para o Latossolo em estudo a capacidade de campo determinada no ponto de inflexão apresenta maior valor de umidade em comparação aos demais métodos e que mesmo nesse ponto são encontradas diferenças na estimativa em razão do modelo utilizado. Pelo psicrômetro WP4-T, valores significativamente menores de umidade foram encontrados para a estimativa do ponto de murcha permanente. Concluiu-se que a capacidade de água disponível foi influenciada marcantemente pelo método utilizado na estimativa da capacidade de campo e do ponto de murcha permanente, o que precisa ser considerado em virtude da importância prática desse parâmetro.Termos de indexação: capacidade de campo, ponto de murcha permanente, modelagem da curva de retenção de água do solo, Latossolo, planejamento de uso terra.

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Section: Resultsmentioning

confidence: 98%

Plant-available soil water capacity: estimation methods and implications

Silva

Silva²,

Oliveira³

et al. 2014

Rev. Bras. Ciênc. Solo

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“…In this study the macropore values, in both areas and depths, were between 13.29 and 14.31 % higher than the 10 % considered the minimum for plant growth (Drewry & Paton, 2005;Drewry et al, 2006;Reynolds et al, 2008).…”

Section: Resultsmentioning

confidence: 48%

Spatial variability of physical attributes of an alfisol under different hillslope curvatures

Camargo¹,

Júnior

Pereira

2010

Rev. Bras. Ciênc. Solo

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SUMMARYThe influence of relief forms has been studied by several authors and explains the variability in the soil attributes of a landscape. Soil physical attributes depend on relief forms, and their assessment is important in mechanized agricultural systems, such as of sugarcane. This study aimed to characterize the spatial variability in the physical soil attributes and their relationship to the hillslope curvatures in an Alfisol developed from sandstone and growing sugarcane. Grids of 100 x 100 m were delimited in a convex and a concave area. The grids had a regular spacing of 10 x 10 m, and the crossing points of this spacing determined a total of 121 georeferenced sampling points. Samples were collected to determine the physical attributes related to soil aggregates, porosity, bulk density, resistance to penetration and moisture within the 0-0.2 and 0.2-0.4 m depth. Statistical analyses, geostatistics and Student's t-tests were performed with the means of the areas. All attributes, except aggregates > 2 mm in the 0-0.2 m depth and macroporosity at both depths, showed significant differences between the hillslope curvatures. The convex area showed the highest values of the mean weighted diameter, mean geometric diameter, aggregates > 2 mm, 1-2 mm aggregates, total porosity and moisture and lower values of bulk density and resistance to penetration in both depth compared to the concave area. The number of soil attributes with greater spatial variability was higher in the concave area.Index terms: soil-landscape relationship, geostatistics, semivariogram. RESUMO: VARIABILIDADE ESPACIAL DE ATRIBUTOS FÍSICOS DE UM ARGISSOLO SOB DIFERENTES CURVATURAS DO RELEVO

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“…The soil matrix air capacity (ACM) was calculated by the difference between the equilibrium volumetric water content at -1 and -10 kPa. The relative water capacity (RWC) was obtained by the ratio between the field capacity and the soil total porosity (REYNOLDS et al, 2008).…”

Section: Methodsmentioning

confidence: 99%

“…Fidalski et al (2008) also determined the ACM, finding values from 0.16 to 0.19 m 3 m -3 , which were considerably greater than our values (0.06 to 0.08 m 3 m -3 ), indicating that the soil texture has a large influence in the ACM value. Besides, according to Reynolds et al (2008), an ACM criterion has not yet been fixed, but they consider that an ACM upper than 0.10 m 3 m -3 appears to be acceptable. Thus, our results indicated an improper physical quality in all treatments applied, as a function of this parameter.…”

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confidence: 99%

Soil Physical Quality After Nitrogen Fertilizers Use in Irrigated Pasture of Tifton 85

Melo

Guimarães

Silva

et al. 2017

RSA

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-Tifton 85 (Cynodon sp.) is a forage crop widely used for the voluminous production, but it has also the potential to promote preservation or improvement in soil structural quality, when well managed. The aim of this work was to evaluate the soil physical quality in a rotational grazing area of Tifton 85 under irrigation in Prudente de Morais, MG, Brazil, due to the application of mineral and organic nitrogen fertilizers. The treatments included different forms of N supply: 400 kg ha -1 of urea; 400 kg ha -1 of bovine manure; 400 kg ha -1 of urea and manure, in proportion 1:1 and the control, without nitrogen fertilization. The following soil physical quality indicators were determined in the layers 0.0-0.05 m and 0.05-0.10 m after two years of N application: water retention curve, total porosity, macroporosity, microporosity, soil bulk density, available water capacity, bulk soil air capacity, soil matrix air capacity and relative water capacity. There were differences among the treatments, in both layers. In general, the treatments using bovine manure promoted greater water storage and availability, which was related to the increase of the microporosity, due to the organic matter effect. However, these same treatments presented a relative compaction, which was associated to the maintenance of higher soil moistures. It was concluded that, even under the effects of intensive grazing, there was generally adequate soil physical quality, but a special attention is recommended to the soil susceptibility to compaction.Keywords -water availability, soil aeration, organic fertilization, Cynodon sp.Resumo -O Tifton 85 (Cynodon sp.) é uma cultura forrageira muito utilizada para a produção de volumosos, mas também demonstra potencial para promover preservação ou melhoria da qualidade estrutural do solo, quando bem manejada. O objetivo deste trabalho foi avaliar a qualidade física do solo em área de pastejo rotacionado de Tifton 85 irrigado em Prudente de Morais, MG, Brasil, em função da aplicação de adubos nitrogenados de origem mineral e orgânica. Os tratamentos incluíram diferentes formas de suprimento de N: 400 kg ha -1 de ureia; 400 kg ha -1 de esterco bovino; 400 kg ha -1 de ureia e esterco, na proporção 1:1 e a testemunha, sem adubação nitrogenada. Determinaram-se os seguintes indicadores de qualidade física do solo nas camadas 0.0-0.05 e 0.05-0.10 m, após dois anos de manejo: curva de retenção de água, porosidade total, macroporosidade, microporosidade, densidade do solo, capacidade de água disponível, capacidade de aeração do solo, capacidade de aeração da matriz do solo e capacidade relativa de água no solo. Houve diferenças entre os tratamentos, em ambas as camadas. Em geral, os tratamentos com o uso de esterco promoveram maior retenção e disponibilidade de água, o que foi relacionado ao incremento da microporosidade, devido ao efeito da matéria orgânica. No entanto, esses mesmos tratamentos apresentaram uma relativa compactação, o que foi associado à manutenção de maiores umidades no solo. Concluiu-se ...

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Optimal soil physical quality inferred through structural regression and parameter interactions

Cited by 152 publications

References 47 publications

Plant-available soil water capacity: estimation methods and implications

Plant-available soil water capacity: estimation methods and implications

Spatial variability of physical attributes of an alfisol under different hillslope curvatures

Soil Physical Quality After Nitrogen Fertilizers Use in Irrigated Pasture of Tifton 85

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