Thesis
Rock phosphate, manure and compost use in garlic and potato systems in a high intermontane valley in Bolivia
Washington State University
Master of Science (MS), Washington State University
2004
Handle:
https://hdl.handle.net/2376/219
Abstract
A two-year field experiment on high valley Vertic Haplustolls in Bolivia was undertaken to study the effects of rock phosphate, manure, and rock phosphate composted with manure on yields of potato and garlic. While satisfactory yields were obtained from all plots, the results showed that none of the treatments significantly increased yields or available soil phosphorus with respect to the control. High nitrate levels in some areas of the field may have delayed potato tuberization. Adequate levels of background phosphorus in the study area soils, in combination with alkaline conditions and low application rates of the amendments, may explain the lack of treatment response. However, yields from the intensive organic system were comparable to those achieved by local farmers using synthetic fertilizers. Additional research is needed to explore the viability of rock phosphate as an alternative phosphorus source in small farming systems in Bolivia.
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Details
- Title
- Rock phosphate, manure and compost use in garlic and potato systems in a high intermontane valley in Bolivia
- Creators
- Renée Michelle Lorion
- Contributors
- William L. Pan (Degree Supervisor)
- Awarding Institution
- Washington State University
- Academic Unit
- Crop and Soil Sciences, Department of
- Theses and Dissertations
- Master of Science (MS), Washington State University
- Publisher
- Washington State University; Pullman, Wash. :
- Identifiers
- 99900525093701842
- Language
- English
- Resource Type
- Thesis