The isotopic signature of oxygen in phosphate (δ(18)O(P)) of various soil fractions may shed light on P transformations, including phosphorus (P) recycling by soil microorganisms, uptake by plants and P adsorption, precipitation and release by oxides and minerals, thus increasing our understanding on P cycling and lability in soils. We developed and tested a protocol to extract and purify inorg...

The aim of this paper is to establish new transcendence criteria p-adic continued fractions. We prove that a number whose sequence partial quotients bounded in Qp and begins with arbitrarily long palindromes either quadratic or transcendental.

Brazilian semi-arid tropical is responsible for the production and export of fine table grapes, but demand phosphate fertilizers other agricultural inputs increases cost threatens local water bodies by leaching phosphorus (P). The objectives this study were to quantify organic inorganic fractions P determine chemical microbiological attributes related its mineralization in soils cultivated with...

A better understanding of the P dynamic resupply roles fertilization from soil solids to solution is urgently required optimize sustainable fertilizer management practices for efficient supply. five–year experiment was used investigate effects on fractions and availability, kinetic based a novel simulation technique (Diffusive gradients in thin films (DGT) DGT–induced fluxes sediments soils (DI...

Volcanic ash derived soils represent between 50-60% of the total arable land area of southern of Chile, and they are the most important soils for pasture production. In these soils, high phosphorus (P) fixation and, in turn, low P availability and high aluminium (Al) soluble concentrations (at low pH) are the most limiting factors for pasture production. At the same time, the complexes between ...

The Water-Fluctuation-Zone (WFZ) of the Three Gorges Reservoir (TGR) has a special combination of aquatic and terrestrial ecological systems that are exposed to human activity. In this work, three kinds of soil were sampled along the Yangzi River in the TGR-WFZ. Our study focused on phosphorus (P) sorption characteristics and the change in inorganic P fractions for soils in alternately waterlog...

The loss of phosphorus (P) during the early pedogenesis stage is important at the ecosystem level, and it also plays an important role in the global P cycle. The seasonal variation of total P (Pt) and its fractions along a young soil chronosequence (Hailuogou chronosequence) on the eastern slope of Gongga Mountain, SW China, was investigated based on the modified Hedley fractionation technique ...

Quantification of dynamics of soil organic carbon (SOC) pools under the influence of long-term fertilization is essential for predicting carbon (C) sequestration. We combined soil chemical fractionation with stable C isotope analyses to investigate the C dynamics of the various SOC pools after 25 years of fertilization. Five types of soil samples (0-20, 20-40 cm) including the initial level (CK...

Introduction To comprehend soil P transformation and crop uptake, it is necessary to understand how the long-term substitution of mineral fertilizers with stover or biochar affects properties forms. However, effects large-scale continuous application on forms fractions response uptake by corn are largely unknown. The purpose this study was investigate role its in variation Hedley-P fractions. M...

We document an example of a forested watershed at the Coweeta Hydrologic Laboratory with an extraordinary tendency to retain dissolved organic matter (DOM) generated in large quantities within the ecosystem. Our objectives were to determine fluxes of dissolved organic C, N, and P (DOC, DON, DOP, respectively), in water draining through each stratum of the ecosystem and synthesize information on...