Kinetics of K release from soils of Brazilian coffee regions: effect of organic acids

Silva, Vladimir Antônio; Marchi, Giuliano; Guilherme, Luiz Roberto Guimarães; Lima, José Maria de; Nogueira, Francisco Dias; Guimarães, Paulo Tácito Gontíjo

doi:10.1590/s0100-06832008000200008

Cited by 24 publications

(18 citation statements)

References 19 publications

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“…O potássio (K) é o segundo elemento mais absorvido pelas plantas e sua reserva mineral nos solos da região dos cerrados, que são bastante intemperizados (SILVA et al, 2008), é muito pequena, insuficiente para suprir as quantidades extraídas pelas culturas por cultivos sucessivos. A contribuição de todos esses fatores faz com que o manejo da adubação potássica (fonte, doses, métodos e épocas de aplicação) seja de grande importância para a manutenção e a melhoria da produtividade das culturas (VILELA et al, 2007).…”

Section: Introductionunclassified

Desempenho agronômico da soja a doses e épocas de aplicação de potássio no cerrado piauiense

Petter¹,

Silva²,

Pacheco³

et al. 2012

RCA

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RESUMO:A adubação é influenciada pelas condições edafoclimáticas específicas de cada região, sendo que, para algumas regiões, ainda não há uma recomendação de adubação potássica para a soja por parte dos órgãos oficiais de pesquisa, como é o caso do Estado do Piauí. O objetivo deste trabalho foi avaliar a eficiência de doses e épocas de aplicação de potássio (K) na cultura da soja no cerrado piauiense. O trabalho foi conduzido a campo em Latossolo Amarelo Distrófico. O delineamento experimental utilizado foi blocos casualizados, com quatro repetições, em esquema fatorial (5 × 4) + 1, sendo os tratamentos compostos pela combinação de cinco doses de potássio: 30, 60, 90, 120 e 150 kg ha -1 (K 2 O) + controle (zero kg ha -1 ), aplicadas em quatro épocas: 100% no plantio; 50% no plantio e 50% aos 30 dias após a semeadura (DAS); 100% aos 30 DAS; 50% aos 20 DAS e 50% aos 40 DAS. Avaliaram-se as variáveis: altura e fitomassa seca das plantas; teor foliar de K e clorofila; eficiência agronômica no uso e na recuperação do K; índice de colheita de grãos, e produtividade. Apenas a eficiência agronômica no uso e na recuperação do K foi influenciada pelas épocas de aplicação de K. Com exceção da fitomassa seca e do teor relativo de clorofila, todas as demais variáveis foram significativamente influenciadas pelas doses de K aplicadas. Fez-se exceção também a eficiência agronômica no uso do K, que apresentou decréscimo exponencial com as doses. A aplicação de 90 kg ha -1 de K 2 O proporcionou maiores incrementos nas demais variáveis. ABSTRACT: Fertilization is influenced by climatic conditions specific to each region and, for regions such as the State of Piaui, there is still no recommendation of potassium application for soybean by the official research. The objective of this study was to evaluate the efficiency of rates and time of K fertilization for soybean in the cerrado

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Section: Introductionunclassified

Desempenho agronômico da soja a doses e épocas de aplicação de potássio no cerrado piauiense

Petter¹,

Silva²,

Pacheco³

et al. 2012

RCA

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“…A recent review of a global dataset has observed that the RE for K on a global scale (70.1%) seems to be higher than the RE for N (62.1%) and P (64.9%) (Vergutz et al, 2012), although most of the studies reviewed by these authors did not take into account the role of leaf leaching when calculating RE. In fact, K leaches more easily from leaves than N and P; hence it is difficult Marchi et al (2012), Silva et al (2008) and Da Silva et al (2000). ‡Data from Vegas-Vilarrúbia et al (2010).…”

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confidence: 99%

Potassium: a neglected nutrient in global change

Sardans

Peñuelas

2015

Global Ecology and Biogeography

371

265

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Aim Potassium (K) is the second most abundant nutrient in plant photosynthetic tissues after nitrogen (N). Thousands of physiological and metabolic studies in recent decades have established the fundamental role of K in plant function, especially in water-use efficiency and economy, and yet macroecological studies have mostly overlooked this nutrient. MethodsWe have reviewed available studies on the content, stoichiometry and roles of K in the soil-plant system and in terrestrial ecosystems. We have also reviewed the impacts of global change drivers on K content, stoichiometry and roles. ConclusionsThe current literature indicates that K, at a global level, is as limiting as N and phosphorus (P) for plant productivity in terrestrial ecosystems. Some degree of K limitation has been seen in up to 70% of all studied terrestrial ecosystems. However, in some areas atmospheric K deposition from human activities is greater than that from natural sources. We are far from understanding the K fluxes between the atmosphere and land, and the role of anthropogenic activities in these fluxes. The increasing aridity expected in wide areas of the world makes K more critical through its role in water-use efficiency. N deposition exerts a strong impact on the ecosystem K cycle, decreasing K availability and increasing K limitation. Plant invasive success is enhanced by higher soil K availability, especially in environments without strong abiotic stresses. The impacts of other drivers of global change, such as increasing atmospheric CO2 or changes in land use, remain to be elucidated. Current models of the responses of ecosystems and carbon storage to projected global climatic and atmospheric changes are now starting to consider N and P, but they should also consider K, mostly in arid and semi-arid ecosystems.

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“…According to Silva et al (2008), organic matter is essential for the fertility of tropical soils due to the highly weathered state of the clay minerals in the soils that results in a low CEC. In tropical environments, the sustainable management of organic matter is of paramount importance; under sustainable management, it is possible to increase or maintain organic matter levels in the soil and thus maintain high CEC as well.…”

Section: Environmental and Agronomic Aspects Of Biochar Application Tmentioning

confidence: 99%

Biochar: Agronomic and environmental potential in Brazilian savannah soils

Petter

Madari

2012

Rev. bras. eng. agríc. ambient.

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Due to the high activity of microorganisms, the loss of soil organic matter is high in tropical regions. This loss becomes even greater if the soil is managed improperly or when there is no technology that leverages the permanence of the soil carbon by maintaining appropriate levels of organic matter, providing chemical, physical and biological soil improvements and contributing to reduce CO2 emissions to the atmosphere. Due to its aromatic structure, biochar is a highly stable form of carbon in the soil that may contribute to the reduction of greenhouse gas emissions, such as CO2, N2O and CH4, and act as a soil conditioner, improving the physical and chemical properties of the soil. Biochar may also result in increased productivity due to the improvement of soil attributes or a possible electrophysiological effect. Research over the past decades has demonstrated the potential of biochar as a soil conditioner, improving fertility and nutrient-use efficiency, in addition to maximising the productivity of crops, such as soybean and rice.

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Kinetics of K release from soils of Brazilian coffee regions: effect of organic acids

Cited by 24 publications

References 19 publications

Desempenho agronômico da soja a doses e épocas de aplicação de potássio no cerrado piauiense

Desempenho agronômico da soja a doses e épocas de aplicação de potássio no cerrado piauiense

Potassium: a neglected nutrient in global change

Biochar: Agronomic and environmental potential in Brazilian savannah soils

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