Nitrogen‐Supplying Capacity of Soils for Rice and Wheat and Nitrogen Availability Indices in Soils of Northwest India

Nayyar, Atul; Bijay‐Singh,; Yadvinder‐Singh,

doi:10.1080/00103620600583984

Cited by 23 publications

(5 citation statements)

References 21 publications

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“…In India, C org is frequently used by soil testing laboratories as an index of N availability. However, results of our study on acidic soils of northeast India, supported by similar results from alkaline soils of northwest India (Nayyar et al 2006), suggest that an alternative chemical index with better predictive ability than the C org should be used for accurate prediction of plant-available N in Indian soils. It is also noteworthy that the alkaline KMnO 4 -N, which (in addition to C org ) happens to be the most widely used index of soil N-availability in India, although significantly correlated, did not yield satisfactory results compared to the other chemical indices such as PBB-N and acid KMnO 4 -N. Many studies reported that alkaline KMnO 4 method does not provide satisfactory results (Stanford 1978, Gianello and Bremner 1986b, Elkarim and Usta 2001.…”

Section: Resultssupporting

confidence: 50%

“…N tot and C org ), alkaline KMnO 4 , on average, extracted the highest amount of N followed by acidified KMnO 4 , whereas the minimum amount was extracted by hot 2 mol/L KCl, resembling closely by phosphate borate buffer (PBB). Similar differences in the extracting ability of these chemicals were also reported by Nayyar et al (2006) and Li et al (2011). These differences are considered to result from their differential ability to extract N from different pools of organic-N in soils.…”

Section: Resultssupporting

confidence: 48%

“…Correlations of the dry matter yield and %N with various indices showed similar trend and strength as with PNU. Significant correlations observed between most of the indices are expected since most of the extractants draw heavily on soil organic matter N pools (Nayyar et al 2006). However, their differential ability to extract N from different pools may have resulted in hugely different levels of correlations between them.…”

Section: Resultsmentioning

confidence: 99%

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Evaluation of nitrogen availability indices and their relationship with plant response on acidic soils of India

Bordoloi¹,

Singh²,

Manoj-Kumar³

et al. 2013

Plant Soil Environ.

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Plant's nitrogen (N) requirement that is not fulfilled by available N in soil has to be supplied externally through chemical fertilizers. A reliable estimate of soil N-supplying capacity (NSC) is therefore essential for efficient fertilizer use. In this study involving a pot experiment with twenty acidic soils varying widely in properties, we evaluated six chemical indices of soil N-availability viz. organic carbon (C org ), total N (N tot ), acid and alkaline-KMnO 4 extractable-N, hot KCl extractable-N (KCl-N) and phosphate-borate buffer extractable-N (PBB-N), based on their strength of correlation with available-N values obtained through aerobic incubation (AI-N) and anaerobic incubation (ANI-N), and also with the dry matter yield (DMY), N percentage and plant (maize) N uptake (PNU). In general, the soils showed large variability in NSC as indicated by variability in PNU which ranged from 598 to 1026 mg/pot.

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Section: Resultssupporting

confidence: 50%

Section: Resultssupporting

confidence: 48%

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Evaluation of nitrogen availability indices and their relationship with plant response on acidic soils of India

Bordoloi¹,

Singh²,

Manoj-Kumar³

et al. 2013

Plant Soil Environ.

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show abstract

“…Potentially mineralizable N measured after water-logging air-dried soil is frequently used as a reliable indicator of the potential N supplying capacity of a soil (Curtin and McCallum, 2004;Nayyar et al, 2006;Russell et al, 2006). Our measurements found that manures and straw applications to the soil created conditions that promoted an increase in the easily mineralizable organic-N pool.…”

Section: Discussionmentioning

confidence: 71%

Nitrogen mineralisation along a pH gradient of a silty loam UK soil

Pietri¹,

Brookes²

2008

Soil Biology and Biochemistry

100

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“…(Sahrawat, 1983a(Sahrawat, , b, 2006(Sahrawat, , 2010Ros et al, 2011). Instead, successful indices to predict paddy soil's N supplying capacity include N uptake by plants (Sahrawat, 1983a;Nayyar et al, 2006;Curtin and McCallum, 2004) or measurement of increases in soil inorganic N upon incubation (Augus et al, 1994;Mikha et al, 2006). Yet, such "reference" biological methods are time-consuming and expensive with little significance for in-time fertilizer recommendation.…”

Section: Introductionmentioning

confidence: 99%

Subcritical water extraction to isolate kinetically different soil nitrogen fractions

et al. 2013

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Abstract. Soil organic N is largely composed of inherently biologically labile proteinaceous N and its persistence in soil is mainly explained by stabilization through binding to minerals and other soil organic matter (SOM) components at varying strengths. In order to separate kinetically different soil N fractions we hypothesize that an approach which isolates soil N fractions on the basis of bonding strength is required, rather than employing chemical agents or physical methods. We developed a sequential subcritical water extraction (SCWE) procedure at 100, 150 and 200 • C to isolate SOM fractions. We assessed these SCWE N fractions as predictors for aerobic and anaerobic N mineralization measured from 25 paddy soil cores in incubations. SCWE organic carbon (SCWE OC) and N (SCWE N) increased exponentially with the increase of temperature and N was extracted preferentially over OC. The efficiency of SCWE and the selectivity towards N were both lower in soils with increasingly reactive clay mineralogy. Stepwise linear regression found no relations between the SCWE fractions and the anaerobic N mineralization rate but instead with pH and a model parameter describing the temperature dependency of SCWE extraction. Both were linked to texture, mineralogy and content of pedogenic oxides, which suggests an indirect relation between anaerobic NH + 4 release and these edaphic soil factors. N mineralization appeared to be largely decoupled from SOM quantity and quality. From the present study on young paddy soils low in pedogenic oxides and with high fixed NH + 4 content we cannot infer the performance of SCWE to isolate bio-available N in more developed upland soils. There may be potential to separate kinetically different SOM pools from upland soils because 1 • for aerobic N mineralization at 100-150 • C SCWE N was the best predictor; and 2 • SCWE selectively extracted N over C and this preference depended on the mineralogical composition. Hence N fractions differing in bonding strength with minerals or SOM might be isolated at different temperatures, and specifically this association has frequently been found a prominent stabilization mechanism of N in temperate region cropland soils.

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Nitrogen‐Supplying Capacity of Soils for Rice and Wheat and Nitrogen Availability Indices in Soils of Northwest India

Cited by 23 publications

References 21 publications

Evaluation of nitrogen availability indices and their relationship with plant response on acidic soils of India

Evaluation of nitrogen availability indices and their relationship with plant response on acidic soils of India

Nitrogen mineralisation along a pH gradient of a silty loam UK soil

Subcritical water extraction to isolate kinetically different soil nitrogen fractions

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