UNORCACZehetner, Franz2016-04-192016-04-192004Presented at SANREM CRSP Accomplishments and Lessons Learned Workshop, Washington, D.C., 16 June 2004394_Franz_SANREM_Accomp.pdfhttp://hdl.handle.net/10919/65461This presentation reports on a study with the objectives of analyzing the fertility status of the soils in the Cotacachi area, identifying limiting factors in different zones of the area, and examining the long-term effects of nitrogen fertilization and residue management on crop yieldsapplication/pdfen-USSoil managementAgricultural ecosystemsSustainable agricultureSoil fertilityNutrient managementVolcanic soilsSoil productivityNitrogen modelingCrop yieldsFarm/Enterprise Scale Field ScalePresentation