Release of Potassium From the Silt and Sand Fraction of Loess-Derived Soils

Mengel, K.; Rahmatullah,; Dou, Huating

doi:10.1097/00010694-199810000-00004

Cited by 48 publications

(37 citation statements)

References 20 publications

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“…In this case, the higher k" values were due to greater amounts of K released from the nonexchangeable pool. Similar results were reported by Mengel et al (1998) in loess-derived soils and by Castilhos et al (2002) and Villa et al (2004) in lowland soils.…”

Section: Resultssupporting

confidence: 89%

“…The first order and the Elovich models were the equations that best fitted the experimental data, in agreement with results reported elsewhere (LopezPineiro & Navarro, 1997; Mengel et al, 1998;Srinivasarao et al, 2006). For the Oxisol, the firstorder equation best described K release to the extractant solution, whereas the zero order and parabolic diffusion equations did not fit the experimental data (Table 3).…”

Section: Resultssupporting

confidence: 89%

“…The most commonly used mathematical equations to investigate the kinetics of soil K release are zero order, first order, Elovich, and parabolic diffusion (Martin & Sparks, 1983;Lopez-Pineiro & Navarro, 1997;Mengel et al, 1998;Singh et al, 2002, Srinivasarao et al, 2006. Once the best fitting model is found, K release rates for each soil material can be compared.…”

Section: Introductionmentioning

confidence: 99%

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

Silva¹,

Marchi

Guilherme

et al. 2008

Rev. Bras. Ciênc. Solo

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SUMMARYKinetic studies on soil potassium release can contribute to a better understanding of K availability to plants. This study was conducted to evaluate K release rates from the whole soil, clay, silt, and sand fractions of B-horizon samples of a basalt-derived Oxisol and a sienite-derived Ultisol, both representative soils from coffee regions of Minas Gerais State, Brazil. Potassium was extracted from each fraction after eight different shaking time periods (0-665 h) with either 0.001 mol L -1 citrate or oxalate at a 1:10 solid:solution ratio. First-order, Elovich, zero-order, and parabolic diffusion equations were used to parameterize the time dependence of K release. For the Oxisol, the first-order equation fitted best to the experimental data of K release, with similar rates for all fractions and independent of the presence of citrate or oxalate in the extractant solution. For all studied Ultisol fractions, in which K release rates increased when extractions were performed with citrate solution, the Elovich model described K release kinetics most adequately. The highest potassium release rate of the Ultisol silt fraction was probably due to the transference of "non-exchangeable" K to the extractant solution, whereas in the Oxisol exchangeable potassium represented the main K source in all studied fractions. Index terms: successive extractions, first order, zero order, parabolic diffusion, Elovich.( RESUMO: CINÉTICA DE LIBERAÇÃO DO POTÁSSIO EM SOLOS DE REGIÕES CAFEEIRAS: EFEITO DE ÁCIDOS ORGÂNICOSEstudos de cinética de liberação de K podem contribuir para avaliação da disponibilidade deste nutriente no solo para as plantas. Este trabalho teve como objetivos investigar a cinética de liberação do potássio nas frações terra fina, areia, silte e argila de dois solos do Estado de Minas Gerais, Brasil, originalmente cultivados com cafeeiro e comparar quatro equações para descrevê-la. As frações foram submetidas a oito extrações sucessivas (0 a 665 h) com citrato e oxalato 1 mmol L -1 , sendo os resultados de K liberado somados e plotados em função do tempo. Foram comparadas as equações de ordem zero, primeira ordem, Elovich e parabólica de difusão, a fim de verificar qual delas melhor descreve a cinética. Na condução do experimento utilizaram-se amostras do horizonte B de um Latossolo Vermelho distroférrico originado de basalto e de um Nitossolo originado de sienito nefelínico. Para cada equação foram calculados o coeficiente de correlação (r) e o erro-padrão da estimativa (EP). A equação de primeira ordem descreveu melhor os resultados do Latossolo e a equação de Elovich se ajustou melhor aos resultados do Nitossolo. As velocidades de liberação do K para o Latossolo foram semelhantes em todas as frações estudadas, não sendo observado efeito dos ácidos orgânicos na velocidade de liberação do K, porque a maior parte do K liberado foi proveniente da forma trocável. No Nitossolo, o citrato acelerou a liberação do K em todas as frações estudadas, e a fração silte foi a que apresentou maior velocidade, pois possivel...

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Section: Resultssupporting

confidence: 89%

Section: Resultssupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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

Silva¹,

Marchi

Guilherme

et al. 2008

Rev. Bras. Ciênc. Solo

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“…Sand-and siltsized muscovite and biotite can also be a major source of plant-available K, as demonstrated conclusively by Mengel et al 83 in studies with 14 loess-derived Alfisols. These primary minerals, and also K feldspars, are believed to account for the high K-supplying power of sandy Ultisols of the Atlantic Coastal Plain 82,[95][96][97] , while nonexchangeable K reserves can even be important for growing a shallow-rooted crop such as pineapple on the basaltic Andisols of Hawaii 81 .…”

Section: Evaluation Of Soil Potassium Testingmentioning

confidence: 65%

The potassium paradox: Implications for soil fertility, crop production and human health

Khan

Mulvaney

Ellsworth

2013

Renew. Agric. Food Syst.

100

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Intensive fertilizer usage of KCl has been inculcated as a prerequisite for maximizing crop yield and quality, and relies on a soil test for exchangeable K in the plow layer to ensure that soil productivity will not be limited by nutrient depletion. The interpretive value of this soil test was rigorously evaluated by: (1) field sampling to quantify biweekly changes and seasonal trends, (2) characterizing the variability induced by air drying and the dynamic nature of soil K reserves and (3) calculating the K balance in numerous cropping experiments. These evaluations leave no alternative but to question the practical utility of soil K testing because test values cannot account for the highly dynamic interchange between exchangeable and non-exchangeable K, exhibit serious temporal instability with or without air drying and do not differentiate soil K buildup from depletion. The need for routine K fertilization should also be questioned, considering the magnitude and inorganic occurrence of profile reserves, the recycling of K in crop residues and the preferential nature of K uptake. An extensive survey of more than 2100 yield response trials confirmed that KCl fertilization is unlikely to increase crop yield. Contrary to the inculcated perception of KCl as a qualitative commodity, more than 1400 field trials predominately documented a detrimental effect of this fertilizer on the quality of major food, feed and fiber crops, with serious implications for soil productivity and human health.

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“…The dynamic exchange between all these forms controls the release of the soil K from rapidly and slowly exchangeable forms to plantavailable forms under a K-stressed environment (Srinivasa Rao et al 1999, 2000. Furthermore, the rate of K release from the soil solid phase to its solution can significantly affect plant K uptake (Lanyon and Smith 1985) and the availability of soil K to plants is closely related to its rate of release from the rapidly and slowly exchangeable fractions (Al-Kanani et al 1984;Sparks 1995;Mengel et al 1998). The slowly exchangeable K is not considered, in most soil tests, to assess its availability to plants (Helmke and Sparks 1996).…”

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confidence: 99%

Models for potassium release kinetics of four Humic Gleysols high in clay by electro-ultrafiltration

Ziadi¹,

Simard²,

Tran³

2001

Can. J. Soil. Sci.

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Ziadi, N., Simard, R. R. and Tran, T. S. 2001. Models for potassium release kinetics of four Humic Gleysols high in clay by electro-ultrafiltration. Can. J. Soil Sci. 81: 603-611. The rate of K release from the soil solid phase to its solution, especially from its rapidly and slowly exchangeable forms, can affect plant K uptake. The electro-ultrafiltration (EUF) technique was used to kinetically characterize the K release from four soils (Humic Gleysols) from Abitibi-Temiscaming, Quebec, Canada. Potassium was desorbed from soils that received over 166 kg K ha -1 yr -1 from 1994 to 1996. The desorption was carried out for 58 min (4, 4, and every 5 min thereafter for a total of 12 desorptions) at 400 V and 80°C. The amount of K desorbed was between 199 and 342 mg kg -1 . Cumulative K desorption was described by the following six equations: power function, simplified Elovich, extended Elovich, parabolic diffusion, zero-order, and first-order. An incremental first-order equation was also tested. The studied soils have large K supplying capacities as suggested by forage K-uptake and total soil K desorption by EUF. In general, all tested equations adequately described the K release by EUF from the four soils. The incremental first-order equation, used for the first time, described well the soil K release data. The k rate constant from this model was significantly related to forage K uptake (R 2 = 0.58).Results from this study indicate that the investigated soils have large K reserves and that the incremental first-order equation and most of the cumulative ones are suitable for describing the kinetics of the large K release from these fine-textured Gleysols. Les sols à l'étude ont une grande capacité à fournir du K aux plantes tel que suggéré par le prélèvement végétal et le K total désorbé par EUF. En général, tous les modèles étudiés ont décrit adéquatement le K désorbé par EUF. Le modèle incrémentiel de premier ordre, utilisé ici pour la première fois, a décrit précisément la désorption du K. La constante de taux de désorption du K estimé par le modèle incrémentiel est significativement reliée au prélèvement du K par les fourrages (R 2 = 0.58). Les résultats obtenus indiquent que les sols étudiés ont une réserve importante en K et que le modèle incrémentiel de premier ordre ainsi que la majorité des équations cumulatives sont appropriés pour décrire la cinétique de désorption du K de ces Gleysols à texture fine.

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Release of Potassium From the Silt and Sand Fraction of Loess-Derived Soils

Cited by 48 publications

References 20 publications

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

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

The potassium paradox: Implications for soil fertility, crop production and human health

Models for potassium release kinetics of four Humic Gleysols high in clay by electro-ultrafiltration

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