≤600 mg/gram root dry weight
||J.M. Lynch and J.M. Whipps, Substrate flow in the rhizosphere, D. L. Keister and P. B. Cregan (Eds.), The rhizosphere and plant growth, 15-24.© 1991 Kluwer Academic Publishers. p.16 left column bottom paragraph
||Newman E I 1985 The rhizosphere: carbon sources and microbial populations. In Ecological Interactions in Soil: Plants, Microbes and Animals. Eds. A H Fitter, D Atkinson, D J Read and M BUsher. pp 107-121. Blackwell Scientific Publications, Oxford. & Whipps J M 1990 Carbon economy. In The Rhizosphere. Ed. J M Lynch. pp 59-97. John Wiley, Chichester.
||"The major source of substrates for microbial activity in the ectorhizosphere and on the rhizoplane are
rhizodeposition products. They are composed of exudates, lysates, mucilage, secretions and dead cell
material, as well as gases including respiratory CO2 , Depending on plant species, age and environmental
conditions, these can account for up to 40% (or more) of the dry matter produced by plants...Some experiments
have been refined to examine the effect of
a whole range of factors on rhizodeposition including
textural quality (by addition of glass
Ballotini or use of artificial soils), anoxia, water
stress, cultivar, nutrient sources, environmental
parameters and micro-organisms (see Hale and
Moore, 1979 Whipps, 1990). Measured in this
way, values for rhizodeposition do not exceed
600 mg/gram root dry weight (primary sources)."