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You searched for subject:(fertilizer N recovery). Showing records 1 – 2 of 2 total matches.

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University of Melbourne

1. Lam, Shu Kee. Dynamics of nitrogen and greenhouse gas emission under elevated carbon dioxide in semi-arid cropping systems in Australia and China.

Degree: 2012, University of Melbourne

Within less than 50 years, atmospheric carbon dioxide concentration [CO2] will likely be double that observed in 1950. In this higher [CO2] world the sustainability of global crop production may be in jeopardy unless nitrogen (N) management is changed. The effects of elevated atmospheric [CO2] on soil N dynamics and greenhouse gas emissions in semi-arid cropping systems are poorly understood. A meta-analysis of current literature was conducted to quantitatively estimate the effects of elevated [CO2] on soil N dynamics in grain crop and legume pasture systems. The research reported in this thesis investigated the effects of elevated [CO2] on crop N demand, fertilizer N recovery, symbiotic N2 fixation, residual N (fertilizer and legume) availability to a subsequent crop, and greenhouse gas emissions from cropping systems in southern Australia (Horsham) and northern China (Changping) using free-air CO2 enrichment (FACE) facilities and glasshouse chambers. (For complete abstract open document)

Subjects/Keywords: elevated atmospheric [CO2]; free-air CO2 enrichment (FACE); fertilizer N recovery; symbiotic N2 fixation; residual N contribution; greenhouse gas emission

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Lam, S. K. (2012). Dynamics of nitrogen and greenhouse gas emission under elevated carbon dioxide in semi-arid cropping systems in Australia and China. (Doctoral Dissertation). University of Melbourne. Retrieved from http://hdl.handle.net/11343/37276

Chicago Manual of Style (16th Edition):

Lam, Shu Kee. “Dynamics of nitrogen and greenhouse gas emission under elevated carbon dioxide in semi-arid cropping systems in Australia and China.” 2012. Doctoral Dissertation, University of Melbourne. Accessed November 14, 2019. http://hdl.handle.net/11343/37276.

MLA Handbook (7th Edition):

Lam, Shu Kee. “Dynamics of nitrogen and greenhouse gas emission under elevated carbon dioxide in semi-arid cropping systems in Australia and China.” 2012. Web. 14 Nov 2019.

Vancouver:

Lam SK. Dynamics of nitrogen and greenhouse gas emission under elevated carbon dioxide in semi-arid cropping systems in Australia and China. [Internet] [Doctoral dissertation]. University of Melbourne; 2012. [cited 2019 Nov 14]. Available from: http://hdl.handle.net/11343/37276.

Council of Science Editors:

Lam SK. Dynamics of nitrogen and greenhouse gas emission under elevated carbon dioxide in semi-arid cropping systems in Australia and China. [Doctoral Dissertation]. University of Melbourne; 2012. Available from: http://hdl.handle.net/11343/37276


Swedish University of Agricultural Sciences

2. Gnankambary, Zacharia. Compost and fertilizer mineralization effects on soil and harvest in parkland agroforestry systems in the south-Sudanese zone of Burkina Faso.

Degree: 2007, Swedish University of Agricultural Sciences

Decomposition of, and the subsequent nutrient release from tree leaf litter as well as external inputs of nutrients are important in the traditional agroforestry parklands of West Africa. The management of nutrient resources is essential to optimize crop performance and soil fertility. To explore temporal and spatial nutrient release in such management options has been the overall objective of this study. Specifically, this thesis investigated: (i) decomposition patterns and nutrient release from litters of Faidherbia albida and Vitellaria paradoxa; (ii) limitation of microbial respiration, as a result of low nitrogen (N) and phosphorus (P) in the F. albida and V. paradoxa parklands; and (iii) the effects of applications of combined compost and urea on maize yield in the F. albida and V. paradoxa parklands. The litter of F. albida lost more mass and nutrients than litter of V. paradoxa. However, the decomposition rate of V. paradoxa increased in the presence of F. albida litter or following the application of inorganic fertilizers. Soil microbial respiration was mainly limited by P-fixation, but N was also limiting. Two microbial growth peaks were observed when excess carbon and P were present, suggesting that either two pools of N are sequentially available to microbes or that two microbial communities do exist. Respiration tests also indicated that P and N availability to microorganisms were higher under the canopy than outside it. Maize yield was similar with the addition of urea, compost, or a combination of compost and urea, if applied at an equivalent N-content. However, in the driest year, the combination of compost and urea had the greatest effect in the increase of maize yield as compared with control treatments. The maize yield under the canopies of F. albida was up to 2.3 times the yield outside the canopies, while under the canopies of V. paradoxa it was 0.6 to 0.8 times the yield outside the canopies. The yield under the canopy was relatively better in dry year. Compost-N and inorganic fertilizer-N recoveries in maize shoot biomass were low, indicating that a large proportion of maize shoot-N is derived from the soil. Also, under the canopy of F. albida, the proportion of N derived from fertilizer in maize shoot was lower compared with that outside the canopy, implying that the soil N-pool was more readily available to plants under trees. In conclusion, there is a potential to improve the decomposition rate of V. paradoxa litter by inorganic fertilizer application or by mixing it with F. albida litter. Thus, the litter of V. paradoxa can be a useful to improve soil quality, rather than being burnt as is nowadays practiced by the farmers. Application of combined compost and inorganic fertilizer offers a management option that is cheaper than only inorganic fertilizers and more manageable than only compost applications.

Subjects/Keywords: agricultural soils; composting; forest litter; fertilizer application; mineralization; nitrogen; nutrients; microbial flora; soil respiration; biodegradation; canopy; soil fertility; agroforestry; crop performance; burkina faso; Burkina Faso; Canopy; Faidherbia albida; Litter decomposition; Maize; Microbial respiration; N recovery; Nutrient limitation; Vitellaria paradoxa

Record DetailsSimilar RecordsGoogle PlusoneFacebookTwitterCiteULikeMendeleyreddit

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Gnankambary, Z. (2007). Compost and fertilizer mineralization effects on soil and harvest in parkland agroforestry systems in the south-Sudanese zone of Burkina Faso. (Doctoral Dissertation). Swedish University of Agricultural Sciences. Retrieved from http://pub.epsilon.slu.se/1655/

Chicago Manual of Style (16th Edition):

Gnankambary, Zacharia. “Compost and fertilizer mineralization effects on soil and harvest in parkland agroforestry systems in the south-Sudanese zone of Burkina Faso.” 2007. Doctoral Dissertation, Swedish University of Agricultural Sciences. Accessed November 14, 2019. http://pub.epsilon.slu.se/1655/.

MLA Handbook (7th Edition):

Gnankambary, Zacharia. “Compost and fertilizer mineralization effects on soil and harvest in parkland agroforestry systems in the south-Sudanese zone of Burkina Faso.” 2007. Web. 14 Nov 2019.

Vancouver:

Gnankambary Z. Compost and fertilizer mineralization effects on soil and harvest in parkland agroforestry systems in the south-Sudanese zone of Burkina Faso. [Internet] [Doctoral dissertation]. Swedish University of Agricultural Sciences; 2007. [cited 2019 Nov 14]. Available from: http://pub.epsilon.slu.se/1655/.

Council of Science Editors:

Gnankambary Z. Compost and fertilizer mineralization effects on soil and harvest in parkland agroforestry systems in the south-Sudanese zone of Burkina Faso. [Doctoral Dissertation]. Swedish University of Agricultural Sciences; 2007. Available from: http://pub.epsilon.slu.se/1655/

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