prior to being transported into the lake system. The combinaThe accuracy of Arctic lake chronologies has been assessed by tion of these factors commonly leads to radiocarbon ages measuring the C activities of modern carbon sources and that are apparently too old. Discrete macrofossils are rarely applying these isotopic mass balances to dating fossil lake materifound in sufficient quantities for...

refers to molecular-level characteristics such as elemental composition, functional groups, and molecular conFormation of chemically resistant humic substances might be an formation that influence the inherent biodegradability important process controlling recycling of soil C to the atmosphere. of the molecule. Interactions refers to the intermolecular Humic substances are believed to be resist...

In this study, the effects were investigated of salinity, foliar and soil applications of humic substances on the growth and mineral nutrients uptake of Corn (Hagein, Fardy10), and the comparison was carried out of the soil and foliar applications of humic acid treatments at different NaCl levels. Soil organic contents are one of the most important parts that they directly affect the soil ferti...

straw burned (Bird et al., 2001; 2002). Recent work in tropical and temperate rice ecosystems has determined The transition from open-field burning of straw residues to alternathat the operationally-defined mobile humic fraction tive residue management practices may affect soil C sequestration potential and the supply of nutrients to crops. A field study of dual(Na4P2O7 or NaOH extractable) is ...

In the near future, the world will need to gradually replace the use of fossil resources for energy consumption and platform chemicals with other resources. For the energy issue, the ongoing approach is based mainly on a diversity of resources, such as nuclear, coal, hydraulic and wind power, photovoltaics, and biofuels. In the case of chemical platforms, probably the major resource will be bas...

The classical methods for the isolation of soil organic matter (SOM) components use aqueous base or neutral salt solutions, and combinations of aqueous base and pyrophosphate. Organic solvents have been rarely used, largely because of difficulties in recovering solutes. This review provides the relevant chemistry of aqueous and organic chemicals relevant to extracting and fractionating the comp...

The effect of humic substances from different sources on the performance and selected biochemical indicators was studied in 150 one-day-old broiler chickens (Ross 308) divided into control (C) and two tested groups (n = 50). Chickens of tested groups were fed diets supplemented with natural humic compounds (group HS) and sodium humate (group HNa) at amounts of 5 g·kg-1 of feeds in phase 1 and 7...

Compost tea describes a procedure where compost is mixed with water. The mixture may be left to stand with minimal disturbance, also called “compost extract” or “steepage”, or actively supplied with oxygen by an aquarium pump to stimulate population growth of aerobic microbes. This project examined actively aerated compost tea. Over a 3-year period, 25 experiments were conducted where a standar...