Concentrations of Trace Elements in Organic Fertilizers and Animal Manures and Feeds and Cadmium Contamination in Herbal Tea (Gynostemma pentaphyllum Makino).
Thailand is predominantly an agriculture-based country. Organic farming is enlisted as an important national agenda to promote food safety and international export. The present study aimed to determine the concentrations of trace elements in commercial organic fertilizers (fermented and nonfermented) composed of pig and cattle manures available in Thailand. Pig and cattle manures as well as animal feeds were also collected from either animal farms or markets. The results were compared to the literature data from other countries. Fermented fertilizer composed of pig manure contained higher concentrations of nitrogen (N) and phosphorus (P) than fertilizer composed of cattle manure. High concentrations of copper (Cu) and zinc (Zn) were also found in fertilizers and manures. Some organic fertilizers had high concentrations of arsenic (As), cadmium (Cd), and lead (Pb). The range of As concentration in these fertilizers was 0.50-24.4 mg/kg, whereas the ranges of Cd and Pb were 0.10-11.4 and 1.13-126 mg/kg, respectively. Moreover, pig manure contained As and Cd (15.7 and 4.59 mg/kg, respectively), higher than their levels in cattle manure (1.95 and 0.16 mg/kg, respectively). The use of pig manure as soil supplement also resulted in high Cd contamination in herbal tea (Gynostemma pentaphyllum Makino; GP). The Cd concentration in GP plants positively correlated with the Cd concentration in the soil. Therefore, the application of some organic fertilizers or animal manures to agricultural soil could increase some potentially toxic elements in soil, which may be absorbed by plants and, thus, increase the risk of contamination in agricultural products.
Chrysomya megacephala larvae feeding favourably influences manure microbiome, heavy metal stability and greenhouse gas emissions
Chrysomya megacephala is a saprophagous fly whose larvae can compost manure and yield biomass and bio‐fertilizer simultaneously. However, there are concerns for the safety of the composting system, that is risk of diseases spread by way of manure pathogens, residue of harmful metals and emission of greenhouse gases. Microbiota analysis and heavy metal speciation by European Communities Bureau of Reference were evaluated in raw, C. megacephala‐composted and natural stacked swine manure to survey pathogenic bacterial changes and mobility of lead and cadmium in manure after C. megacephala feeding; the emission rate of CH4 and N2O from manure during C. megacephala composting and natural stacking was also measured. C. megacephala composting altered manure microbiota, reduced the risk of pathogenic bacteria and maintained the stability, and microbiota changes might be associated with heavy metal fractions, especially in Pseudomonas and Prevotella. In addition, C. megacephala‐composting significantly reduced the emission rate of CH4 and N2O in comparing with natural stacking situation and the first two days should be the crucial period for CH4 and N2O emission measurement for manure treatment by C. megacephala. Moreover, OTU26 and Betaproteobacteria were changed after C. megacephala composting which might play a role in emission of CH4 and N2O, respectively.
Communist History: An Annual Bibliography (2005)
The subject of this bibliography is the scholarly literature of communist history. For the USA coverage is extensive. For the rest of the Anglophone world coverage is selective, while coverage for the rest of the world is more selective still. Coverage of the former and presently communist countries is largely limited to works dealing with the Communist parties of those countries. Anti-communism is covered selectively, with somewhat more emphasis on its interaction with communism than its nature as a movement/ideology per se. Coverage of related topics, i.e. the labor movement, Marxism, other strains of radicalism, etc., is highly selective and limited to items directly relevant to communism. For coverage of current reportage (newspapers, news weeklies, journals of opinion, Internet/WWW discussion lists, etc.) see the Newsletter of the Historians of American Communism and the Historians of American Communism Discussion List (h-hoac@h-net.msu.edu). The Bibliography is organized into seven sections, listed below. Sections 1–5 are form and genre based (monographs, serials, etc.), while sections 6 and 7 are format based (sound and visual, electronic). Entries are arranged alphabetically within each section. Where the number of entries warrants it, a section is divided into USA and Other. There is no index. Please be aware that most citations for items in electronic format are listed under their appropriate form/genre, i.e. articles in electronic serials are listed under serials. Section 7 (Internet, WWW, etc.) only contains citations for items in forms and genres irreducibly unique to the electronic environment, i.e. discussion lists (and postings and threads therein) and for those web sites and other electronic resources not subsumed under categories 1–7. Items cited are from the calendar year in the title of the Bibliography, with two exceptions, Internet/WWW items, where publication/creation date information is often unavailable or indeterminate, and older items not cited