Inclusion of nitrate and nitrite in the Kjeldahl nitrogen determination of soils and plant materials using sodium thiosulphate

Dalai, Rosalin; Sahrawat, K. L.; Myers, R. J. K.

doi:10.1080/00103628409367572

Cited by 80 publications

(45 citation statements)

References 8 publications

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“…The soil samples taken for analysis from 0-15 cm soil layer were analyzed in the laboratory using standard procedures. Available N, P and K were determined by the methods described by Dalal et al, (1984); Subbiah and Asija (1956); Olsen et al, (1954), respectively.…”

Section: Methodsmentioning

confidence: 99%

Productivity and Weed Dynamics of Integrated Weed Management Practices in Soybean + Pigeonpea Intercropping System

Khazi¹,

Karle²,

Narkhede³

2017

Int.J.Curr.Microbiol.App.Sci

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Section: Methodsmentioning

confidence: 99%

Productivity and Weed Dynamics of Integrated Weed Management Practices in Soybean + Pigeonpea Intercropping System

Khazi¹,

Karle²,

Narkhede³

2017

Int.J.Curr.Microbiol.App.Sci

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“…This was done using the waterlogged procedure of Waring and Bremner (1964), and total-N (<0.25 mm size) by modified Kjeldahl method (Dalal et al . 1984).…”

Section: Soil Sampling and Analysismentioning

confidence: 99%

Sustaining productivity of a Vertosol at Warra, Queensland, with fertilisers, no-tillage or legumes. 7. Yield, nitrogen and disease-break benefits from lucerne in a two-year lucerne - wheat rotation

Dalal¹,

Weston²,

Strong³

et al. 2004

Aust. J. Exp. Agric.

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Abstract. Continuous cultivation and cereal cropping of southern Queensland soils previously supporting native vegetation have resulted in reduced soil nitrogen supply, and consequently decreased cereal grain yields and low grain protein. To enhance yields and protein concentrations of wheat, management practices involving N fertiliser application, with no-tillage and stubble retention, grain legumes, and legume leys were evaluated from 1987 to 1998 on a fertility-depleted Vertosol at Warra, southern Queensland. The objective of this study was to examine the effect of lucerne in a 2-year lucerne-wheat rotation for its nitrogen and disease-break benefits to subsequent grain yield and protein content of wheat as compared with continuous wheat cropping.Dry matter production and nitrogen yields of lucerne were closely correlated with the total rainfall for October-September as well as March-September rainfall. Each 100 mm of total rainfall resulted in 0.97 t/ha of dry matter and 26 kg/ha of nitrogen yield. For the March-September rainfall, the corresponding values were 1.26 t/ha of dry matter and 36 kg/ha of nitrogen yield. The latter values were 10% lower than those produced by annual medics during a similar period. Compared with wheat-wheat cropping, significant increases in total soil nitrogen were observed only in 1990, 1992 and 1994 but increases in soil mineralisable nitrogen were observed in most years following lucerne. Similarly, pre-plant nitrate nitrogen in the soil profile following lucerne was higher by 74 kg/ha (9-167 kg N/ha) than that of wheat-wheat without N fertiliser in all years except 1996. Consequently, higher wheat grain protein (7 out of 9 seasons) and grain yield (4 out of 9 seasons) were produced compared with continuous wheat. There was significant depression in grain yield in 2 (1993 and 1995) out of 9 seasons attributed to soil moisture depletion and/or low growing season rainfall. Consequently, the overall responses in yield were lower than those of 50 kg/ha of fertiliser nitrogen applied to wheat-wheat crops, 2-year medic-wheat or chickpea-wheat rotation, although grain protein concentrations were higher following lucerne.The incidence and severity of the soilborne disease, common root rot of wheat caused by Bipolaris sorokiniana, was generally higher in lucerne-wheat than in continuous wheat with no nitrogen fertiliser applications, since its severity was significantly correlated with plant available water at sowing. No significant incidence of crown rot or root lesion nematode was observed. Thus, productivity, which was mainly due to nitrogen accretion in this experiment, can be maintained where short duration lucerne leys are grown in rotations with wheat.

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“…Another important criterion for N balance studies, is the inclusion of nitrate in the Kjeldahl N. Several methods have been proposed to include nitrate in the total N [2,4]. A critical evaluation of different methods for inclusion of nitrate and nitrite using 15N labelled compounds showed that the sodium thiosulfate method gives quantitative recovery of nitrate and nitrite [4].…”

Section: General Discussion and Review Of Literaturementioning

confidence: 99%

“…The method used for total N determination was a macro-version of the Kjeldahl method modified to include nitrate and nitrite using sodium thiosulfate [4]. In addition to effecting quantitative recovery of nitrate, this method does not require pretreatment of samples with water as is needed in case of the salicylic acid--sodium thiosulfate or KMnO4-Fe modifications of the Kjeldahl method for some soils [1,5].…”

Section: Methodsmentioning

confidence: 99%

Evaluation of distilling the entire digest or an aliquot for total nitrogen determination in soil digests

Sahrawat

Pardhasaradhi

Murthy

1989

Fertilizer Research

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Accurate and easy to adapt methods of total soil N determination are a prerequisite for N balance research. For JSN balance studies certain modifications of the regular methods are generally adopted, e.g. the distillation of an aliquot of the digest in preference to the entire digest. However, comparative evaluation of such methods has not been investigated. In this study, three methods of distilling soil digests were evaluated for the determination of total N in diverse Alfisols and Vertisols. These are distillation of a clear aliquot (suspended materials allowed to settle) of the digest, distillation of an aliquot with suspended materials, following digestion in a block digestor, and distillation of the entire digest following macro-Kjeldahl digestion. The total N content of soils were determined to be similar whether the aliquot distilled was a clear solution or a suspension with solid materials, and these results were similar to those obtained by distilling the entire digest. The precision obtained by the three methods of distillation was similar for the Vertisols but for the Alfisols, distillation of the clear aliquot of the digest was found to be most precise.

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Inclusion of nitrate and nitrite in the Kjeldahl nitrogen determination of soils and plant materials using sodium thiosulphate

Cited by 80 publications

References 8 publications

Productivity and Weed Dynamics of Integrated Weed Management Practices in Soybean + Pigeonpea Intercropping System

Productivity and Weed Dynamics of Integrated Weed Management Practices in Soybean + Pigeonpea Intercropping System

Sustaining productivity of a Vertosol at Warra, Queensland, with fertilisers, no-tillage or legumes. 7. Yield, nitrogen and disease-break benefits from lucerne in a two-year lucerne - wheat rotation

Evaluation of distilling the entire digest or an aliquot for total nitrogen determination in soil digests

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