Advances in Agronomy, Vol. 125 by Donald L. Sparks PDF

By Donald L. Sparks

Advances in Agronomy remains to be well-known as a number one reference and a primary resource for the most recent learn in agronomy. As regularly, the themes coated are diverse and exemplary of the myriad of subject material handled through this long-running serial.

  • Maintains the top impression issue between serial guides in agriculture
  • Presents well timed reports on very important agronomy matters
  • Enjoys a long-standing popularity for excellence within the field

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Chem. 25, 1608–1612. , 1957. The exchange of oxygen between sulfuric acid and water. J. Am. Chem. Soc. 79, 56–60. , 2000. Phosphate concentrations in lakes. Nature 406, 54–56. , 1998. Phosphorus retention mechanisms in the sediment of an eutrophic mining lake. Water Air Soil Pollut. 108, 341–352. , 1996. Oxygen isotope analyses of co-existing carbonate and phosphate in biogenic apatite: a way to monitor diagenetic alteration of bone phosphate. Earth Planet. Sci. Lett. 142, 1–2. , 2013. Stable isotope fractionations during reactive transport of phosphate in packed-bed sediment columns.

In a recent experimental study, Jaisi et al. (2010) reconfirmed that PdO bonds are very robust and do not break or alter during sorption/desorption of Pi to/from Fe-oxides and do not exchange O with ambient water, but rather entire PO4 ions (irrespective of 18O or 16O or the different combinations of 18O and 16O in PO4) are adsorbed or desorbed intact. 2). Sorption of Pi onto ferrihydrite surfaces does, however, involve kinetic fractionations of oxygen isotopes between intact aqueous and sorbed phase Pi ions during ion exchange.

Further research is needed to identify and distinguish the relative contribution of plant and microbial P cycling pathways in soils. Separation of microbial Pi and (bio)available Pi by adding hexanol in resin extraction method similar to that defined by Hedley et al. , 2012) is an another breakthrough in the successful application of natural abundance oxygen isotope measurements to further understand how individual Pi pools evolve over time (Fig. 13). These authors found out that the parental P sources such as rocks or vegetation, irrespective of original d18Op values, should be cycled by soil microorganisms before being released as (bio)available Pi pool suggesting a continuous flux of P between the available Pi pool and the microbial Pi pool.

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