Temporal dynamics of the physical quality of an Andisol under a grazing system subjected to different pasture improvement strategies

Zúñiga, Felipe; Ivelic-Sáez, Jorge; López, Ignacio F.; Huygens, Dries; Dörner, José

doi:10.1016/j.still.2014.09.014

Cited by 37 publications

(40 citation statements)

References 41 publications

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“…The soil under native secondary forest showed lower volume of blocked pores in all soil layers, when compared with the soil cultivated with banana, which corroborates the results obtained by Alencar (2014) and by Zúñiga et al (2015). Particularly in the 0.0-0.1-m soil layer, the soil under secondary native forest showed almost the totality of its pores available for gas flow, with only 0.39% of blocked pores.…”

Section: Resultssupporting

confidence: 89%

Pore network of an Inceptisol under different uses and relativized S-index as an indicator of soil physical quality

Júnior

Mota

Freire

et al. 2016

Pesq. agropec. bras.

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-The objective of this work was to evaluate soil porous media quality under different uses, as well as to propose a new index to monitor changes in its structure due to management: the S relative index. An Inceptisol under irrigated banana cultivation and secondary forest, in the Brazilian Apodi Plateau, was evaluated at three soil layers (0.0-0.1, 0.1-0.2, and 0.2-0.3 m) as to: particle size, particle and bulk density, organic matter content, intrinsic permeability to air, and water retention curve. Total porosity, index for pore continuity (defined by the ratio between soil intrinsic permeability to air and aeration porosity), volume of blocked pores, and the S and S relative indices were determined. The S relative index was calculated as the ratio between S-index values from undisturbed and disturbed samples of the same soil (S undisturbed /S disturbed ). Under the studied conditions, the S relative index is a good quantifier of the changes imposed by soil use and management. Soil cultivation maintains or improves the quality of the evaluated attributes, except for blocked porosity, when compared with the soil under native secondary forest with ten years of regeneration after agricultural use.Index terms: blocked porosity, irrigation management, pore continuity, soil management, soil permeability to air, S relative index. Rede de poros de um Cambissolo sob diferentes usos e índice S relativizado como indicador da qualidade física do soloResumo -O objetivo deste trabalho foi avaliar a qualidade do meio poroso de solo submetido a diferentes usos, bem como propor um novo índice para monitorar mudanças em sua estrutura devidas ao manejo: o índice S relativo . Um Cambissolo sob cultivo de banana irrigada e mata secundária, na Chapada do Apodi, foi avaliado em três camadas (0,0-0,1, 0,1-0,2 e 0,2-0,3 m), quanto a: granulometria, densidade de partículas e do solo, conteúdo de matéria orgânica, permeabilidade intrínseca ao ar e curva de retenção de água. Foram determinados porosidade total, índice de continuidade dos poros (definido pela razão entre a permeabilidade ao ar e a porosidade de aeração), volume de poros bloqueados, e índices S e S relativo . O índice S relativo foi calculado como a razão entre os valores do índice S em amostras indeformadas e deformadas de um mesmo solo (S indeformada /S deformada ). Nas condições estudadas, o índice S relativo mostra-se como um bom quantificador das alterações impostas pelo uso e pelo manejo do solo. O cultivo do solo mantém ou melhora a qualidade dos atributos avaliados, exceto para porosidade bloqueada, em comparação ao solo sob mata secundária com dez anos de regeneração após uso agrícola.Termos para indexação: porosidade bloqueada, manejo da irrigação, continuidade de poros, manejo do solo, permeabilidade ao ar, índice S relativo .

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Section: Resultssupporting

confidence: 89%

Pore network of an Inceptisol under different uses and relativized S-index as an indicator of soil physical quality

Júnior

Mota

Freire

et al. 2016

Pesq. agropec. bras.

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“…The field experiments were established in Valdivia agro‐ecosystems (South of Chile) two different sowing dates, on 2 Sept. 2015 (late sowing‐season 1) and on 4 July 2016 (early sowing‐season 2), at the Estación Experimental Agropecuaria Austral (39°46′ S, 73°13′ W) of the Universidad Austral de Chile. The soil was developed from deposits of volcanic ash over marine sediments, classified as Duric Hapludand, corresponding to the “Valdivia series” (Centro de Informaciόn de Recursos Naturales [CIREN], 2003; Luzio & Casanova, 2006), characterized by soil organic matter contents of >12.0% (Dörner et al., 2015), bulk density <.9 Mg m –3 (Zúñiga, Ivelic‐Sáez, Lόpez, Huygens, & Dörner, 2015), and a clay fraction dominated by short‐range‐order minerals (CIREN, 2003). The Valdivia agro‐ecosystem is characterized by a temperate rainy climate with a marine influence, and an average temperature of 12°C and rainfall of 2500 mm per year (Gonzalez‐Reyes & Muñoz, 2013).…”

Section: Methodsmentioning

confidence: 99%

Effect of slow‐release nitrogen on the nitrogen availability in an andisol and the critical nitrogen concentration in wheat

Clunes

Pinochet

2020

Agronomy Journal

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The use of coated fertilizers and the concept of the critical N dilution curve are alternatives capable of improving the production efficiency of wheat (Triticum aestivum L.) crops in agro-ecosystems. The objectives of this work were to evaluate the effect of a slow release urea-coated fertilizer on (i) the production of wheat's shoot biomass at the anthesis stage, (ii) the concentration of N in the shoot biomass, and (iii) the N availability in the Andisol. Two fertilizers: urea and urea-coated were evaluated using four increasing N rates and a control treatment (without fertilization), in three application strategies, during two growing seasons (late sowing [S1] and early sowing [S2]). Samples of shoot biomass and soil (0-20-cm depths) were collected at five wheat growth stages (Z21, Z31, Z39, Z45, Z69 on the Zadoks scale). The average production of shoot biomass was 10.3 t dry matter (DM) ha -1 for S2 and 7.9 t DM ha -1 for S1 and N concentrations was between 1.0-3.0%. When using a coated urea fertilizer in this Valdivian agro-ecosystem, no statistical differences (P < .05) in shoot biomass or wheat N concentrations were found at anthesis (Z69). Differences were principally between seasons. We therefore proposed a new adjustment to the dilution N curve, with a value concentration critical, N c start of 3.80%, and 4.15%, for S1 and S2, respectively. Use demand parameters such as N c adjusted to the agro-ecosystem for wheat crop, allows to rationalize the fertilization according to inorganic N available from the soil.Abbreviations: AS, all of the fertilizer was applied at sowing; AT, all of the fertilizer was applied at the end of tillering; CU, Nutrisphere-Urea; DM, dry matter; GDD, growing degree days; N c , critical nitrogen concentration; NNI, nitrogen nutrition index; S1, season 1; S2, season 2; SA, split application with one-third applied at sowing and two-thirds at the end of tillering; U, urea.

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“…La acción conjunta de las tensiones externas (pre-compactación artificial) e internas (ciclos de secado y humectación) en el caso de P 1 resulta en un sistema poroso estable, cumpliendo con la teoría de la tensión efectiva (Seguel y Horn, 2005) que favorece la estabilidad mecánica; tal hecho fue demostrado por Zúñiga et al (2015) en sistemas pratenses, donde el pisoteo previo generó una estabilidad porosa sostenida en el tiempo. En profundidad existe la tendencia a aumentar la macroporosidad hasta la dosis de 30 Mg ha -1 de CB; con dosis de 60 Mg ha -1 los macroporos disminuyen, demostrando la inestabilidad que generan las aplicaciones excesivas de materia orgánica (Seguel et al, 2003).…”

Section: -186unclassified

Pre-Compactación Y Acondicionamiento Organico Para La Recultivación De Un Suelo De Textura Gruesa (Typic Xerochrepts) Disturbado Por Extracción De Áridos

Seguel

Rodríguez

Soto

et al. 2017

Chil. j. agric. anim. sci.

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RESUMENLa extracción de áridos genera un daño a la estructura del suelo superficial, disminuyendo su capacidad de soporte. Con el objeto de recuperar un suelo agrícola (Typic Xerochrepts, franco arenoso) disturbado por extracción de arenas sub-superficiales, se desarrolló un estudio en la zona central de Chile, en macetas de 20 L, estableciendo tratamientos con dos factores: pre-compactación (sin y con dos niveles crecientes) e incorporación de enmienda orgánica (cama broiler en dosis de 0, 15, 30 y 60 Mg ha -1 ). Se evaluó el efecto de los tratamientos sobre las propiedades físicas del suelo (densidad aparente, distribución de tamaño de poros, resistencia mecánica, estabilidad de agregados, repelencia al agua) y el rendimiento de materia seca y producción de vainas comerciales de un cultivo de poroto verde (Phaseolus vulgaris L.). La reposición del suelo post-extracción de arena sub-superficial generó una condición de alta porosidad gruesa, baja retención de agua y baja capacidad de soporte; la combinación de la enmienda orgánica en dosis menores a 30 Mg ha -1 y la ausencia de pre-compactación, promueve un asentamiento excesivo del suelo, lo que disminuye los macroporos y aumenta la resistencia mecánica. Sin embargo, la pre-compactación hasta alcanzar niveles de densidad aparente entre 1,05 y 1,15 Mg m -3 y dosis de enmienda de entre 15 y 30 Mg ha -1 , favorecen la mejor condición física del suelo, generando una mayor estabilidad de agregados y la máxima producción de materia seca y rendimiento de vainas comerciales.Palabras clave: Phaseolus vulgaris, recuperación de suelo, pre-compactación, enmienda orgánica, propiedades físicas de suelo. ABSTRACTSubsoil extraction of subsurface sandy layers causes damages to soil structure, decreasing its loading capacity. A study was conducted in central Chile in order to reclaim an agricultural soil (Typic Xerochrepts, sandy loam) disturbed by subsurface sand mining. The study was conducted in pots of 20 L, and treatments with two factors were established: pre-compaction (without and with two increasing levels), and the addition of organic amendment (broiler litter in doses of 0, 15, 30 and 60 Mg ha -1 ). The effect of the treatments was evaluated on soil physical properties (bulk density, pore size distribution, mechanical strength, aggregate stability and water repellency), dry matter yield and pod production of green beans (Phaseolus vulgaris L.). The replenishment of soil after the extraction of subsurface sand generated a condition of high coarse porosity, low water retention and [174][175][176][177][178][179][180][181][182][183][184][185][186] Recibido: 02 marzo 2017.Aceptado: 10 abril 2017. INTRODUCCIÓNLa extracción de áridos es una actividad productiva en la cual se retiran materiales geológicos de una determinada área, removiendo el suelo superficial; un caso especialmente importante es la extracción de áridos en terrenos de uso agrícola, donde los materiales de interés se encuentran en estratas sub-superficiales, y para su extracción se necesita remover los horiz...

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Temporal dynamics of the physical quality of an Andisol under a grazing system subjected to different pasture improvement strategies

Cited by 37 publications

References 41 publications

Pore network of an Inceptisol under different uses and relativized S-index as an indicator of soil physical quality

Pore network of an Inceptisol under different uses and relativized S-index as an indicator of soil physical quality

Effect of slow‐release nitrogen on the nitrogen availability in an andisol and the critical nitrogen concentration in wheat

Pre-Compactación Y Acondicionamiento Organico Para La Recultivación De Un Suelo De Textura Gruesa (Typic Xerochrepts) Disturbado Por Extracción De Áridos

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