Factors Affecting the Determination of Available Soil Nitrogen by Chemical Methods: I. Comparison of Extractable With Mineralized Nitrogen

Verstraeten, L. M. J.; Vlassak, K.; Livens, J.

doi:10.1097/00010694-197011000-00002

Cited by 15 publications

(4 citation statements)

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“…Introduction of a single EON fraction in fertilizer recommendations is only useful when the slope of the regression between EON and mineralizable N is independent of other variables such as year, experimental site and management history. However, numerous papers have shown that such slopes differ between seasons (Last & Draycott, 1971; Sharifi et al , 2007b), soil texture and pH classes (Stanford & Smith, 1978; Groot & Houba, 1995), and land uses, drainage classes and soil management histories (Verstraeten et al , 1970; Fox & Piekielek, 1984; Williams et al , 2007). Hence, the assumption that a single EON fraction, without these covariates, can be used to improve fertilizer recommendations is open to criticism.…”

Section: Introductionmentioning

confidence: 99%

Nitrogen mineralization: a review and meta‐analysis of the predictive value of soil tests

Ros

Temminghoff

Hoffland

2010

European J Soil Science

113

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Accurate estimation of mineralizable nitrogen (N) from soil organic matter is essential to improve fertilizer management in agricultural systems. Mineralizable N refers to the amount of N in soil that is released during a certain period (ranging from 1 week to the length of a growing season). It has been estimated from increases in inorganic N during incubation or from N uptake by plants grown in a greenhouse or field. Many chemical soil tests measuring extractable organic N (EON) fractions have been proposed to predict mineralizable N. We evaluated the predictive value of these soil tests, using 2068 observations from 218 papers. Meta-analysis was used to find the best soil test, to analyse differences between field and laboratory experiments, and to determine whether their predictive value is affected by extraction intensity (% of total soil N that is extracted). The concentration of EON was positively related to mineralizable N, explaining on average 47% of the variation. It did not, however, explain more of the variation than total N. Best predictions (57% < R 2 < 74%) were obtained when EON was extracted with hot CaCl 2 , acid KMnO 4 , acid K 2 Cr 2 O 7 , hot water or hot KCl. Extraction intensity was not related to the strength of the above-mentioned relationship. Predictions of mineralizable N were significantly worse when mineralization was measured in the field compared with measurements under controlled conditions. We found no evidence of a causal and direct relationship between EON and mineralizable N. Accuracy of soil testing may improve when the current 'single soil test approach' changes to a more complex approach, which includes different soil tests, soil properties and environmental conditions.

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Section: Introductionmentioning

confidence: 99%

Nitrogen mineralization: a review and meta‐analysis of the predictive value of soil tests

Ros

Temminghoff

Hoffland

2010

European J Soil Science

113

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“…The hot-water method proposed by Keeney and Bremner (1966b) involves estimation of the N extracted by boiling a soil sample with water containing potassium sulfate under reflux for 60 min. The results of this method have been shown to be significantly correlated with N uptake by ryegrass (Lolium multiflorum) and with the results of aerobic and anaerobic incubation procedures (Keeney and Bremner, 1966a;Jenkinson, 1968;Verstraeten et al, 1970;Lathwell et al 1972;Gasser and Kalembasa, 1976). However, this method and any other method that involves determination of total N extracted from a soil sample has the disadvantage that it requires a Kjeldahl analysis.…”

Section: Several Incubation Methods Have Been Proposed During the Pasmentioning

confidence: 88%

Chemical methods of assessing potentially available organic nitrogen in soil

Gianello

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“…One of the most used extraction procedures has been the water-extracted N obtained by boiling a soil-water mixture. Verstraeten et al (1970) proposed the use of a mild extrac tion procedure based on the hydrolysis of organic N compounds from the soil organic matter. The authors suggested an ex traction with water at room temperature for 30 min followed by a filtration under vacuum and a second extraction with 1%…”

Section: Chemical Indexes Of Available Nitrogenmentioning

confidence: 99%

“…KCl, An alternative procedure also suggested by Verstraeten et al (1970) consisted of heating by refluxing 25 g of soil with 150 ml of distilled water for 60 min. In both proce dures, mineral N released was determined as a final product of the hydrolysis.…”

Section: Chemical Indexes Of Available Nitrogenmentioning

confidence: 99%

Indexes of plant available organic nitrogen in soils

Rojas

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Factors Affecting the Determination of Available Soil Nitrogen by Chemical Methods: I. Comparison of Extractable With Mineralized Nitrogen

Cited by 15 publications

References 0 publications

Nitrogen mineralization: a review and meta‐analysis of the predictive value of soil tests

Nitrogen mineralization: a review and meta‐analysis of the predictive value of soil tests

Chemical methods of assessing potentially available organic nitrogen in soil

Indexes of plant available organic nitrogen in soils

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