Soil organic phosphorus (SOP) can greatly contribute to plantavailable P and P nutrition. The study was conducted to determine the effects of organic amendments on organic P fractions and microbiological activities in paddy soils. Samples were collected at the Changshu Agro-ecological Experiment Station in Tahu Lake Basin, China, from an experiment that has been performed from 1999 to 2004, on ...

Understanding how soil phosphorus (P) fractions change is critical to achieve more efficient P use in a highly P-sorbing calcareous soil. The fields were managed without or with annual fertilizer (40 kg ha? 1), continuously growing sole cropping intercropping of maize and faba bean. Soil samples (0–200 mm) collected at the start experiment eight years later, we evaluated using sequential fracti...

Elemental contents in catchment headwaters are indicative of the load of nutrients and minerals cycled or released from ecosystems, yet little is known about natural colloids (1–1000 nm) and especially natural nanoparticles (NNP, 1–100 nm) as nutrient carriers in forested headwater streams. We hypothesize that the majority of P is bound to NNP in forest streams but that their size and compositi...

The paper deals with effects of liming and different doses of municipal sewage sludge (5, 10, and 15 % of soil mass) on copper speciation in soil. In all samples, pH was determined together with total copper concentration, which was measured with the ICP-AES method. Concentration of copper chemical fractions was determined using the seven-step procedure of Zeien and Brümmer. In the soil treated...

abstract zinc (zn) is an essential plant nutrient. knowledge about distribution of zn between its different chemical forms is useful in understanding the chemistry of this element in soil and also in development of soil testing procedures. the present study was conducted to obtain such information about distribution of zinc forms in 20 soil samples of lorestan province by the use of a sequentia...

Organic phosphorus (P) fractions in surface sediments from a large shallow, eutrophic Lake Taihu, China, were extracted with 0.1 M NaOH after pre-treatment of the sediments with a solution composed of 0.1 M EDTA and 2% (w/v) Na(2)S(2)O(4). Composition of organic P in the extracts was then characterized by (31)P nuclear magnetic resonance spectroscopy ((31)P NMR). Several P species, including ph...

Abstract Purpose The tropical phosphorus cycle and its relation to soil (P) availability are a major uncertainty in projections of forest productivity. In highly weathered soils with low P concentrations, plant microbial communities depend on abiotic biotic processes acquire P. We explored the seasonality relative importance drivers controlling fluctuation common pools via such as litter produc...