January 2010
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Soil & Groundwater E-Zine January 2010 |
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| This Month´s Featured Articles, Papers & Reports |
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Overcoming iron bacteria problems: An Australian perspective
Iron bacteria are becoming an increasing problem in groundwater bores and are estimated to affect about 40% of the world’s water bores with anecdotal evidence indicating that this number is steadily increasing. Iron bacteria derive energy during their metabolism through oxidising soluble ferrous iron, present in the groundwater, to its insoluble ferric form. The resultant biofilm is commonly found as a slimy or gelatinous deposit and over time these deposits develop into solid encrustations that ... |
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Long-term fertilizer experiment network in China: Crop yields and soil nutrient trends
Results are summarized for the first 15 yr of an eight-site, long-term experimental network in China designed to assess the sustainability of cropping systems in environments representing 70% of Chinese cropland. Systems were wheat–maize double cropping (two crops per year) at four sites, wheat–rice double cropping, rice-based triple cropping, and wheat or maize single cropping. Without fertilizers, wheat yields were mainly 1 t ha–1, and maize yields were 2 t ha–1. With NPK fertilizer (rates averaging ... |
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