Book ChapterDOI
Total Nitrogen 1
J. M. Bremner
- pp 1149-1178
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The article was published on 1965-01-01. It has received 667 citations till now.read more
Citations
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Journal ArticleDOI
An extraction method for measuring soil microbial biomass c
TL;DR: In this paper, the effects of fumigation on organic C extractable by 0.5 m K2SO4 were examined in a contrasting range of soils and it was shown that both ATP and organic C rendered decomposable by CHCl3 came from the soil microbial biomass.
BookDOI
Forest hydrology and ecology at Coweeta.
Wayne T. Swank,D. A. Crossley +1 more
TL;DR: A complete review and summary of more than 50 years study of the hydrological and ecological responses of baseline and managed Southern Appalachian hardwood forests at Coweeta is provided in this article.
Journal ArticleDOI
Alleviation of drought stress in the common bean (Phaseolus vulgaris L.) by co-inoculation with Paenibacillus polymyxa and Rhizobium tropici
Márcia do Vale Barreto Figueiredo,Hélio Almeida Burity,Cosme Rafael Martínez,Chris P. Chanway +3 more
TL;DR: It is hypothesized that co-inoculation of bean with R. tropici (CIAT 899) and P. polymyxa strains (DSM 36) and Loutit (L) mitigates some of the negative effects of drought stress on bean.
Journal ArticleDOI
Growth and ion uptake by wheat supplied nitrogen as nitrate, or ammonium, or both
W. J. Cox,H. M. Reisenauer +1 more
TL;DR: The effects of concentration and source (NH4, NO3, and NO3 plus NH4) of added N on the rate of growth, final yield, and content and rate of intake of N, P, K, Ca, Mg and S by wheat seedlings were evaluated as mentioned in this paper.
Journal ArticleDOI
Forage yield and quality of common vetch mixtures with oat and triticale in two seeding ratios
TL;DR: Results showed that mixture of common vetch with oat at the 65:35 seeding ratio achieved a higher forage yield and protein content than the other mixtures studied.
References
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Determination of nitrogen in soil by the Kjeldahl method
TL;DR: The reliability of the Kjeldahl method for the determination of nitrogen in soils has been investigated using a range of soils containing from 0·03 to 2·7% nitrogen as discussed by the authors.
Journal ArticleDOI
The Kjeldahl determination of nitrogen : a critical study of digestion conditions-temperature, catalyst, and oxidizing agent.
HA McKenzie,HS Wallace +1 more
Abstract: The effect of temperature on the rate of Kjeldahl digestions in the absence of catalyst and oxidizing agent has been studied. Both the clearing time and the minimum time for complete recovery of nitrogen are markedly decreased by raising the digestion temperature. The appreciable rise in temperature during prolonged digestions and the effect of time and temperature on the pyrolytic loss of nitrogen are considered. By proper choice of digestion conditions nitrogen can be completely recovered in a reasonable time even from refractory compounds. The time may be further decreased by the use of mercury as catalyst. The use of hydrogen peroxide as an oxidant in Kjeldahl digestions is discussed and the effects of the volume and number of additions at various temperatures after different cooling times determined. Earlier claims regarding complete recoveries with few additions cannot be substantiated. A modified micro-apparatus for the distillation of ammonia from Kjeldahl digestions is described and acidimetric methods for the determination of the ammonia are critically examined. As a result of this work it is possible to develop procedures for the Kjeldahl determination of nitrogen in various materials. A rapid and precise method for the determination of 0.2-2 mg of nitrogen in amino acids and proteins is described.