Books about Fertilised from Amazon.com

As Gray is quoted as saying, "if the Orchid-book (with a few trifling omissions) had appeared before the 'Origin' the author would have been canonised rather than anathematised by the natural theologians.".
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This digital document is a journal article from Forest Ecology and Management, published by Elsevier in 2004. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.

Description:
Soils at seven nitrogen (N) and phosphorus (P) fertiliser experiments in Australia were sampled to determine the changes in exchangeable and soil solution cation concentrations resulting from fertiliser application. Nitrogen fertiliser was applied as ammonium sulphate and/or urea at cumulative rates in the range 0-1600kgNha^-^1 and the P fertiliser as single or triple superphosphate at cumulative rates in the range 0-600kgPha^-^1. High cumulative rates of fertiliser application (greater than 600kgNha^-^1 and 250kgPha^-^1) resulted in acidification of the topsoil at five sites, but had no effect on soil pH at the other two sites. Acidification of deeper soil layers was also observed at the one site where sub-soils were sampled. Exchangeable cations were generally lower in the fertilised treatments than the non-fertilised treatments whereas, there was evidence of a short-term increase in base cation concentrations in solution. Exchangeable and soil solution cation concentrations provided contrasting interpretations of site rankings and the effects of N fertilisation. The fate of cations depleted from surface soils probably included increased uptake by fertilised trees, as increased growth rates have been reported for a number of the experimental sites, and there was some evidence of increased base cation leaching in the fertilised treatments. .
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This digital document is a journal article from Applied Soil Ecology, published by Elsevier in 2005. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.

Description:
In this study, faunal analysis of nematode communities in an aquic brown soil (silty loam Hapli-Udic Cambosols in Chinese Soil Taxonomy) of Northeast China was conducted through a single wheat growth season, aimed to assess nematode faunal response to the application of slow-release urea fertiliser. Three treatments (conventional urea CU, slow-release urea SRU and control NU) were installed, and nematode ecological indices (enrichment index EI, basal index BI, structural index SI and channel index CI) were used to quantify the influence of various treatments on the nematode fauna. The results showed that soil C/N values were significantly greater in SRU than in CU at the wheat tillering stage, while soil urease activity exhibited a reverse trend. During the study period, SI values were significantly greater in SRU than in NU and CU, and CI had a negative correlation with NO"3^--N and NH"4^+-N. Among the indices used in this study, SI was the only one that detected nematode community structural differences between SRU and CU during the wheat growth season, and indicated a greater food web diversity and structure in SRU than in CU, showing the positive effect of applying slow-release urea. .
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This digital document is a journal article from Chemosphere, published by Elsevier in 2006. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.

Description:
Gaseous nitrogen (N) loss from field-applied manure in the form of ammonia (NH"3) and nitrous oxide (N"2O) has negative agronomic, environmental and health implications. This study was undertaken to evaluate the combined effect of soil type and dicyandiamide (DCD) on NH"3 and N"2O emissions following application of liquid hog manure. Soil samples (100g) were placed in 500mL screw-top Mason-jars and de-ionised water was added to bring the soil samples to 50%, 70% and 90% water-filled pore space (WFPS). Slurry and slurry+DCD treatments were applied at a rate of 116000lha^-^1. The jars were then sealed and incubated at 21^oC for 21d. Ammonia volatilisation was quantified using boric acid traps while N"2O gas concentrations were analysed using gas chromatography. Results showed that DCD had no effect (p>0.05) on either NH"3 or N"2O emissions. However, soil type had a significant effect (p<0.05) on both gases. Overall, the Pugwash soil produced 3 and 2.5 times more NH"3 and N"2O, respectively, than the Acadia soil. N"2O emissions from both soils increased with an increase in %WFPS, indicating that during the spring and fall in Atlantic Canada, when soils are generally wet, a significant amount of N"2O may be emitted from these soils. The relationship between cumulative N"2O and %WFPS was best described by an exponential function R^2=0.83 and p<0.05 (both soils). Therefore, soil type should be taken into consideration when formulating N"2O emission factors. The addition of DCD together with slurry may not be a viable strategy to mitigate N"2O emissions from acidic soils. To reduce emissions of both gases, livestock slurry should not be applied on wet soils. .
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