Fertilidade e carbono total e oxidável de Latossolo de Cerrado sob pastagem irrigada e de sequeiro

Loss, Arcângelo; Coutinho, Fernando Silva; Pereira, Marcos Gervásio; Silva, Renata Aparecida Costa e; Torres, José Luiz Rodrigues; Neto, Alexandre Ravelli

doi:10.1590/s0103-84782013000300008

Cited by 7 publications

(8 citation statements)

References 14 publications

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“…Soil management systems: conventional tillage system with sorghum (CTS-S), sunflower (CTS-F) and maize (CTS-M); no-till system with sorghum (NTS-S), sunflower (NTS-F) and maize (NTS-M); native forest (NF). These results were due to the straw accumulation in the NTS during all year and the maintenance of soil moisture by irrigation in the high temperatures of the Brazilian semiarid region, which favored a continuous biological activity and plant residue decomposition, increasing the SOM contents and contributing to the accumulation and maintenance of labile fractions of carbon (LOSS et al, 2013). The labile SOM fractions of the NTS was similar to the NF, denoting the system great sustainability and soil quality (SÁ et al, 2014).…”

Section: Resultsmentioning

confidence: 99%

“…The humic substances (HS) are the most stable forms of organic matter in the soil, representing most (90%) of the TOC (FRACETTO et al, 2012). The HS contents in the soil layer 0.05-0.10 m (NTS-M>NTS-S=NTS-F>CTS-M=CTS-F=CTS-S) are directly related to the amount of plant cover on the soil surface, and to the maintenance of soil moisture and high temperatures in the Brazilian semiarid region, which contribute to a constant biological activity, favoring the humification process (LOSS et al, 2013). According to Marinho et al (2016) the carbon content in humic fractions are more efficient in identifying differences between soil management systems than the TOC, as well as the most labile forms of carbon.…”

Section: Resultsmentioning

confidence: 99%

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Organic Matter Fractions of an Irrigated Oxisol Under No-Till and Conventional Tillage in the Brazilian Semi-Arid Region

et al. 2017

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-The replacement of natural vegetation by crop systems directly impacts the soil organic matter fractions. The objective of this study was to evaluate the total organic carbon (TOC) and nitrogen (TN) contents in different fractions of the soil organic matter (SOM) of an Oxisol of the Brazilian semiarid region under different irrigated crops and different soil management systems. Seven treatments were evaluated, which consisted of two soil management systems (no-till and conventional tillage) and three crops (maize, sunflower and sorghum), using as reference the soil under a native forest (NF). The summer crops preceded common bean crops in the autumn-winter. The total organic carbon content, total nitrogen, carbon content in humic substances and their constituents (fulvic acids, humic acids and humin) and labile, non-labile and water-soluble carbon contents were evaluated two years and three months after the experiment implementation to determine the carbon lability (L) lability index (LI), partitioning index (CPI) and management index (CMI). The greatest carbon, nitrogen and organic matter contents in the soil surface layer (0.00-0.05 m) were found in crops under no-till system (NTS), especially maize. The crops under NTS presented greater carbon content in humic substances than the conventional tillage system (CTS) ones in the layer 0.05-0.10 m. The crops under NTS presented greater sustainability in the Brazilian semiarid region compared with those under CTS, as shown by their higher CMI in the soil surface layer.Keywords: Humic substances. Labile carbon. Sustainability. FRAÇÕES DA MATÉRIA ORGÂNICA EM LATOSSOLO IRRIGADO NO SEMIÁRIDO SOB PLANTIO DIRETO E PREPARO CONVENCIONALRESUMO -A substituição da vegetação natural pela agricultura impacta diretamente as frações da matéria orgânica no solo. Este estudo avaliou os teores de carbono orgânico total (COT) e nitrogênio total (NT) nas frações da matéria orgânica do solo (MOS) em um Latossolo do semiárido brasileiro sob diferentes sistemas de manejo com diferentes culturas irrigadas. Os sete tratamentos foram compostos por dois sistemas de manejo do solo (plantio direto e convencional) e três culturas: sorgo, girassol e milho tendo como referência o solo sob mata nativa (MN). A semeadura das culturas no verão precedeu a semeadura de feijão no outono/inverno. Após dois anos e três meses de implantação, avaliaram-se os teores de carbono orgânico total, nitrogênio total, teor de carbono nas substâncias húmicas e seus constituintes (fração ácidos fúlvicos, húmicos e humina), teores de carbono lábil, carbono não-lábil e carbono solúvel em água, sendo determinados a labilidade (L), índice de labilidade (IL), índice de compartimento de carbono (ICC) e índice de manejo de carbono (IMC). Os cultivos sob sistema de plantio direto (SPD) nas condições semiáridas, em especial com o milho, promoveram maiores teores de carbono, nitrogênio e frações da matéria orgânica, na camada superficial do solo (0,00 a 0,05 m). Na camada de 0,05-0,10 m os cultivos sob SPD promoveram ...

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Organic Matter Fractions of an Irrigated Oxisol Under No-Till and Conventional Tillage in the Brazilian Semi-Arid Region

et al. 2017

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“…The levels of labile and humified organic matter were highest in the irrigated system in both soil layers (Table 2). Coffee biomass increased by irrigation (Perdoná et al, 2012;Evangelista et al, 2013), with a consequent increase in SOM, leading to the accumulation in its different fractions (Loss et al, 2013).…”

Section: Resultsmentioning

confidence: 99%

Organic matter fractions in soil under coffee with split applications of phosphorus and water regimes

Araújo

Figueiredo

Borges

et al. 2014

Rev. bras. eng. agríc. ambient.

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Phosphorus fertilization and irrigation management are essential practices to increase coffee yields, though information is scarce about the effect of these practices on organic matter fractions of soils of the ‘Cerrado’ (savanna-like vegetation). The purpose of this study was to evaluate organic matter fractions of a clayey Oxisol under coffee with split applications of phosphorus (P) and water regimes. The experimental design was a randomized block with 3 x 2 factorial arrangement with three split applications of P (P1: 300 kg ha-1 P2O5 applied annually of which 2/3 applied in September and 1/3 in December; P2: 600 kg ha-1 P2O5 applied at planting and every two years, and P3: 1800 kg ha-1 of P2O5 applied only at planting, corresponding to a 6-year requirement), two water regimes (with and without irrigation) and three replications. Soil from the 0-5 and 5-10 cm layers was sampled. The total organic carbon (TOC), labile carbon (LC), microbial carbon (Cmic), and carbon fractions of fulvic acid (FA), humic acid (HA) and humin (HU) were determined. The irrigation regime of coffee increased the TOC, LC and Cmic levels and the humified fractions of soil organic matter. In general, the form of P splitting had little influence on the fractions of soil organic matter.

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“…It also permits the separation of the labile from the non-labile organic C forms, providing valuable information on the soil organic matter quality (Chan et al, 2001;Loss et al, 2013).…”

Section: Oxidizable Organic C Fractionsmentioning

confidence: 99%

“…Thus, the partitioning of soil organic matter into the functional compartments with different dynamics represents an important tool to readily detect recent changes in the soil in response to changes in management practices (Sequeira et al, 2011;Blanco-Moure et al, 2013). The labile fractions of soil organic matter such as LF, POC and C fractions extracted using low degrees of oxidation with H 2 SO 4 (Chan et al, 2001), may be more sensitive indicators of the changes caused by modifications in soil management practices (Loss et al, 2013;Souza et al, 2014;Marques et al, 2015), and an analysis of these compartments will deepen the understanding of SOC dynamics (Carter, 2001). …”

Section: Introductionmentioning

confidence: 99%

Changes in Soil Organic Carbon Fractions in Response to Cover Crops in an Orange Orchard

Oliveira

Xavier

2016

Rev. Bras. Ciênc. Solo

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ABSTRACT:The cultivation of cover crops intercropped with fruit trees is an alternative to maintain mulch cover between plant rows and increase soil organic carbon (C) stocks. The objective of this study was to evaluate changes in soil total organic C content and labile organic matter fractions in response to cover crop cultivation in an orange orchard. The experiment was performed in the state of Bahia, in a citrus orchard with cultivar 'Pera' orange (Citrus sinensis) at a spacing of 6 × 4 m. A randomized complete block design with three replications was used. The following species were used as cover crops: Brachiaria (Brachiaria decumbes) -BRAQ, pearl millet (Pennisetum glaucum) -MIL, jack bean (Canavalia ensiformis) -JB, blend (50 % each) of jack bean + millet (JB/MIL), and spontaneous vegetation (SPV). The cover crops were broadcast-seeded between the rows of orange trees and mechanically mowed after flowering. Soil sampling at depths of 0.00-0.10, 0.10-0.20, and 0.20-0.40 m was performed in small soil trenches. The total soil organic C (SOC) content, light fraction (LF), and the particulate organic C (POC), and oxidizable organic C fractions were estimated. Total soil organic C content was not significantly changed by the cover crops, indicating low sensitivity in reacting to recent changes in soil organic matter due to management practices. Grasses enabled a greater accumulation of SOC stocks in 0.00-0.40 m compared to all other treatments. Jack bean cultivation increased LF and the most labile oxidizable organic C fraction (F1) in the soil surface and the deepest layer tested. Cover crop cultivation increased labile C in the 0.00-0.10 m layer, which can enhance soil microbial activity and nutrient absorption by the citrus trees. The fractions LF and F1 may be suitable indicators for monitoring changes in soil organic matter content due to changes in soil management practices.

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Fertilidade e carbono total e oxidável de Latossolo de Cerrado sob pastagem irrigada e de sequeiro

Abstract: RESUMO A irrigação por aspersão em pastagem pode aumentar a produção de forragem e melhorar as condições químicas do solo. O objetivo deste trabalho foi avaliar a fertilidade e os teores de carbono total e oxidável de Latossolo 0-5, 5-10, 10-20 and 20-40cm depth, to

Cited by 7 publications

References 14 publications

Organic Matter Fractions of an Irrigated Oxisol Under No-Till and Conventional Tillage in the Brazilian Semi-Arid Region

Organic Matter Fractions of an Irrigated Oxisol Under No-Till and Conventional Tillage in the Brazilian Semi-Arid Region

Organic matter fractions in soil under coffee with split applications of phosphorus and water regimes

Changes in Soil Organic Carbon Fractions in Response to Cover Crops in an Orange Orchard

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