Sentence examples for soil substance from inspiring English sources
The base-soluble fraction is in all cases older than the food crusts (Figure 4), indicating contamination with an older soil substance.
Attention should be called to the major difference between renewable biomass production and destructive use of soil substances.
Although we did not isolate live virus from these samples, the detection of nucleic acid and previous isolation of viruses from bat feces and urine (10 ) warrants some concern that guano miners might be exposed to bat pathogens in fresh excreta as well as in soil substances.
This is consistent with a study conducted in Nairobi, Kenya, where 61.2% of the respondents reported soil as substance ingested [ 5].
In the present study, more than half of the respondents (59.7%) identified soil as substance ingested by pregnant women.
Interestingly, DOSY spectra of the fractionated RES4 of this study differed significantly from those reported in literature for bulk humic substances from oak and pine forest soil humic substances [22], which showed different values of diffusivity for aromatic, hydroxyalkyl, and alkyl protons.
The presence of low amount of IAA in different soil humic substances has been reported [33,44].
The characteristics of soil humic substances and the influence of environmental factors in natural Chamaecyparis forests in subtropical mountain regions are poorly understood.
The understanding of Frank Stevenson of the nature of soil humic substances was anchored in the interpretation formed in the fifties by the Russian soil scientist, Prof. M.M. Kononova and expressed in her 1961 book "Soil Organic Matter".
Soil humic substances support plant growth and appear to do so by stimulating development of soil microbial populations and enhancing uptake of essential nutrients and trace elements (Piccolo et al. 1993, 1997).
Another study combined HRMAS and DRIFT (Diffuse reflectance infrared Fourier transform spectroscopy) techniques to identify the relationship between the structure of soil humic substances and long-term (40 years) soil management practices, including organic and/or mineral fertilizations [25].
