Publications by Research Topic
Selected Peer Reviewed Publications*, Proceedings, or Reports
Soil quality and microbial ecology
Oliveras-Berrocales, L. Pérez-Alegría, D. Sotomayor-Ramírez. 2017. Geostatistical analysis for mapping soil salinity in the Lajas Valley Agricultural Reserve, Southwestern Puerto Rico. Journal of Agriculture of the University of Puerto Rico. 101: 1-15.
*López, G., I. Almonte, D. Sotomayor Ramírez, P. Nuñez. 2014. Caracterización biológica de suelos y sustratos empleados en la producción de vegetales en invernaderos. Ciencia del Suelo. 32 (1): p. xxxx.
*López-Rodríguez, G., D. Sotomayor-Ramírez, J.A. Amador, E.C. Schröder. 2014. Contribution of nitrogen from litter and soil mineralization to shade and sun coffee (Coffea arabica L.) agro ecosystems. Tropical Ecology. 56: 21-33.
*Pérez, A., C. Céspedes, I. Almonte, D. Sotomayor Ramírez, E. Cruz, P.A. Núñez. 2012. Evaluación de la calidad del suelo explotado para la minería después de diferentes sistemas de manejo. TERRALATINOAMERICANA. 30 (3): 1-11.
*Nuñez, P.A., A. Pimentel, I. Almonte, D. Sotomayor-Ramírez, N. Martínez, A. Pérez, and C.M. Céspedes. 2011. Soil fertility evaluation of coffee (coffea spp.) production systems and management recommendations for the Barahona Province, Dominican Republic. J. Soil Science and Plant Nutrition. 11: 137-150.
*Amador, J.A., K. Winiarski, D. Sotomayor-Ramirez. 2013. Earthworm communities along a forest-coffee agroecosystem gradient: Preliminary evidence supporting the habitat-dependent feeding hypothesis. Tropical Ecology. 54 (3): 365-374.
*Amador, J.A., Ramos, C.V., M. Alfaro, D. Sotomayor-Ramírez. 2010. Impact of coffee management practices on earthworm populations in Puerto Rico. Caribbean J. Sci. (In Press).
*Sotomayor-Ramírez D., L. Cruz, L. Pérez-Alegría. 2010. Soil organic matter stocks and spatial distribution in the Río Grande de Arecibo watershed. J. Agric. Univ. P.R. 94: 1-23.
*Sotomayor-Ramírez, D., Y. Espinoza. 2010. Soil aggregation and organic carbon fractions in the Rio Grande de Arecibo watershed. J. Agric. Univ. P.R. 94: 25-39.
* Sotomayor-RamírezD., Y. Espinoza, V. Acosta-Martínez. 2009. Land use effects on microbial biomass C, β-glucosidase and β-glucosaminidase activities, and availability, storage and age of organic C in soil. Biology and Fertility of Soils. 45: 487-497. DOI 10.1007/s00374-009-0359x
* Acosta-Martínez, V., D. Acosta-Mercado, D. Sotomayor-Ramirez, and L. Cruz. 2008. Microbial communities and enzymatic activities under different management of semiarid soils. Applied Soil Ecology. 38: 249-260.
Sotomayor-Ramírez, D. Y. Espinoza, V. Acosta-Martínez, J. Amador, E, Schröder, and K. Winiarski. 2008. Soil biological community structure in coffee (Coffea arabica L.) agroecosystems. 44th Annual Meeting of the Caribbean Food Crops Society. Miami FL, 13-18 July 2008. 44(2): 333-345.
Amador, J.A., K. Winiarski, and D. Sotomayor-Ramírez. 2008. Impact of coffee management practices on the soil ecosystem: Earthworm community function. 44th Annual Meeting of the Caribbean Food Crops Society. Miami FL, 13-18 July 2008. 44(2): 356-364.
* Sotomayor-Ramírez, D., Y. Espinoza. R. Rámos-Santana. 2006. Short-term tillage practices on soil organic matter pools in a tropical Ultisol. Australian Journal of Soil Research. 44: 1-7.
* Acosta-Martínez, V., L. Cruz, D. Sotomayor-Ramírez, and L. Pérez-Alegría. 2006. Enzyme activities as affected by soil properties and land use in tropical watershed. Applied Soil Ecology. 35: 35-45.
* Sotomayor-Ramírez, D., A. Lugo-Ospina, and R. Rámos-Santana. 2004. Vegetation influence on soil quality in a highly degraded tropical soil. J. Agric. Univ. P.R. J. Agric. Univ. P.R. 88: 11-26.
Water quality
Chappell, J., S. Whitmire, D. Sotomayor-Ramírez, G. Martínez-Rodríguez. 2021. The influence of environmental parameters on the phytoplankton community of two tropical reservoirs. Lakes and Reservoirs.
Chappell, J., S. Whitmire, D. Sotomayor-Ramírez, G. Martínez-Rodríguez. 2019. Effects of Corbicula fluminea on the nutrient concentration and phytoplankton biomass of tropical reservoirs. International Aquatic Research. 11: 401-415. DOI 10.1007/s40071-019-00247-x
Viggiano, M., G. Martínez, and D. Sotomayor. 2013. Use of artificial substrata to estimate periphyton growth rate in tropical streams. Proceedings. American Society of Limnology and Oceanography Meeting, New Orleans, U.S.A. February 2013
Gualtero-Leal, D., G.A. Martínez, C. Santos-Flores, and D. Sotomayor-Ramírez. 2010. Benthic algal diversity and biomass as indicators to establish reference streams in Puerto Rico. Verh. Internat. Verein. Limnol. (In press).
* Amador, J.A., D. Sotomayor-Ramírez, G. Martínez, L. Chen, and D. Bachoon. 2008. Tracking human faecal contamination in tropical reservoirs in Puerto Rico. Lakes and Reservoirs: Research and Management. 13: 301-317.
* Sotomayor-Ramírez, D., G. A. Martínez, F. Pantoja-Agreda, and C. Santos-Flores. 2008. Limnological assessment of two reservoirs in Puerto Rico. Verh. Internat. Verein. Limnol. 30: 1-7.
* Pantoja-Agreda, F. G.A.Martínez, C. Santos-Flores and D. Sotomayor-Ramírez. 2009. Phytoplankton dynamics of the Guajataca reservoir, Puerto Rico. Verh. Internat. Verein. Limnol. 30: 1-5
* Sotomayor-Ramírez, D., M. Alameda, G. Martínez, L. Pérez-Alegría, and R. Corvera. 2006. Microbiological surface-water quality of the Rio Grande watershed, Puerto Rico. Caribbean J. Sci. 42(2): 151-163.
Martínez, G., D. Sototomayor-Ramírez, and L. Pérez-Alegría. 2005. Development of numeric nutrient criteria in lakes and reservoirs of Puerto Rico, Final Termination Report submitted to PREQB. October 2005. 59 pp.
* Sotomayor-Ramírez, D., G. Martínez, and L.J. Olivieri. 2001. Phosphorus status of stream waters in Puerto Rico: 1989-1997. J. Agric. Univ. P.R. 85: 1-15.
Nutrient transport and watershed management
Martínez, G.A., C.J. Santos-Flores, R. Macchiavelli, D. Sotomayor-Ramírez, L. Pérez-Alegría. 2016. Nutrient levels associated with ecological thresholds of impairment: An approach to estimate numeric nutrient criteria for reservoirs of Puerto Rico. J. Agric. Univ. PR. 99: 63-86.
Martínez-Rodríguez, G. A., C. Santos-Flores, R. Macchiavelli, D. Sotomayor-Ramírez, and L. Pérez-Alegría. 2015. Nutrient Levels Associated with Ecological Thresholds of Impairment: An alternate approach to estimate numeric nutrient criteria for reservoirs in Puerto Rico. J. Agric. Univ. P.R. 99 (2): 1-63.
Ramírez-Avila, J.J., D. Sotomayor-Ramírez, G.A. Martínez-Rodríguez, L.R. Pérez-Alegría. 2011. Phosphorus in runoff from two highly weathered soils of the tropics. Can. J. Soil Sci. 91: 267-277.
Sotomayor-Ramírez, D., G. Ardila-Sierra, G. Martínez-Rodríguez, L. Pérez-Alegría. 2010. Phosphorus persistence in runoff from an Ultisol amended with dairy manure sludge. World Congress of Soil Science. Proceedings and Poster presentation. Brisbane Australia, 1 – 8 Aug 2010.
* Sotomayor-Ramírez, D., G.A. Martínez, J. Ramírez-Avila, E. Más. 2008. Effectiveness of grass filter strips for runoff nutrient and sediment reduction in dairy sludge-amended pastures. J. Agric. Univ. P.R. 92: 1-14.
* Sotomayor-Ramírez, D., J. Ramírez-Avila, E. Mas, and G. Martínez. 2008. Erosion and nutrient loss reduction with an alternative planting method for coffee (Coffea arabica). J. Agric. Univ. P.R. 92: 153-169
Sotomayor-Ramírez, D., L. Pérez-Alegría, and G. Martínez. 2007. Establishing the framework for the development of dissolved oxygen TMDL for Lago Dos Bocas, Puerto Rico. Final Project Report to USEPA Region 2. Performed under agreement X7982829-0302. 45 p. with apendices.
* Ortega-Achury, S.L. G.A. Martínez-Rodríguez, D. Sotomayor-Ramírez, and M. Muñoz-Muñoz. 2007. Nutrient concentrations in runoff from different manure amended fields of the tropics under natural rainfall conditions. J. Agric. Univ. P.R. 91: 101-115.
Sotomayor-Ramírez, D. L. Pérez-Alegríz, G. Martínez, and R. Corvera-Gomringer. 2006. Annual sediment and nutrient contribution from two tropical subbasins. In (J. Martínez-Casasnovas, I. Pla-Sentís, M.C. Ramos-Martín, and C. Balasch-Solanes eds.). P. 257 – 260. Proceedings International ESSC Conference on Soil and Water conservation under changing land use. 12 to 15 September, Lleida, Cataluña, España.
* Sotomayor-Ramírez, D., G. Martínez, L. Pérez-Alegría. J.J. Ramírez. 2006. Off-field transport of phosphorus from an Ultisol under Pasture. J. Agric. Univ. P.R. 90: 159-172.
Sotomayor-Ramírez, D., G. Martínez, L. Pérez-Alegría. J.J. Ramírez. 2005. Final Project Report for: Surface runoff studies using simulated rainfall in Puerto Rico.
Sotomayor-Ramírez, D., L. G. Martínez, and L. Pérez-Alegría. 2004. The Río Grande de Arecibo Watershed: II Characterization and management of nonpoint pollution sources. Final Project Report with contract no. 2003-00044. April 2003 – June 2004. 64 pp.
* Martínez, G.A., D. Sotomayor-Ramírez, and J.A. Castro. 2002. Application of the Caribbean P index to soils receiving organic amendments. J. Agric. Univ. P.R. 86: 145-154.
Tesis – Gustavo Suarez hydrologic modeling (MSc Thesis President L. Pérez-Alegría)
Tesis – Jairo Díaz, hydrologic-sediment modeling (MSc Thesis President L. Pérez-Alegría)
Tesis – Yamilis Ocasio – “Evaluación nutricional de cinco tributarios del Río Grande de Arecibo”(MSc Thesis President G. Martínez)
Tesis – Edwin Martínez – Nutrient transport from watersheds (MSc Thesis President L. Pérez-Alegría)
Nutrient management and soil fertility
Sotomayor, D. & Araya, K. 2021. Improved Tropical Forage Fertilizer-P Calibration: In support of FRST to conduct state-level soil-fertility correlation and calibration trials for P and/or K. Ag Data Commons.
Rivera-Zayas, J., Sotomayor-Ramírez, D., & Barnes, R. 2017. Nitrogen fertilizer rate for improving inbred maize (Zea mays L.) yield on the semi-arid southern coast of Puerto Rico. The Journal of Agriculture of the University of Puerto Rico, 101(2), 185–202.
Oliveras-Berrocales, M. D. Sotomayor-Ramírez, J. Delgado, L. Pérez-Alegría. 2017. The new Caribbean Nitrogen Index to assess nitrogen dynamics in vegetable production systems in southwestern Puerto Rico. International Soil and Water Conservation Research. 5: 69-75. https://doi.org/10.1016/j.iswcr.2017.01.001
Sotomayor-Ramírez, D., M. Oliveras-Berrocales, L. Wessel-Beaver. 2016. Fertilizer nitrogen management in an onion and tropical pumpkin rotation in Puerto Rico. HortTechnology. 26(6): 831-838. doi:10.21273/HORTTECH03482-16.
Ruiz. T.M., D. Sotomayor-Ramírez, C. Torres-Meléndez, G. A. Martínez-Rodriguez. 2016. Phosphorus mass cycling and balance in dairy farms: Case studies in Puerto Rico. Agriculture Ecosystems and Environment. 220: 115-124. https://doi.org/10.1016/j.agee.2016.01.003
Sotomayor Ramírez, 2014. Fundamentos para el manejo práctico de nutrientes: Guías para la interpretación de análisis de suelo. 23 de octubre 2014. Taller de adiestramiento para extensionistas. disponible en: http://academic.uprm.edu/dsotomayor/Reprints_SummaryReports.htm
Sotomayor-Ramírez, D., J. Barragán, G. Lozada-Ramírez, R. Jaramillo. 2013. Trends in fertilizer consumption in Puerto Rico. J. Agric. Univ. P.R. 97(1-2):15-32.
Sotomayor-Ramírez, D. 2011. Fertilidad de suelos y manejo de nutrientes en forraje de corte. Presentación en Foro Especial Fertilidad de Suelos y Efecto en la Calidad de Forrajes. EEA Lajas, Jueves 26 de mayo 2011.
Sotomayor-Ramírez, D., M.J. Barrgán, G. Lozada, J. Caraballo. 2011. Tendencias en el consumo de fertilizantes en Puerto Rico. Presentación en el Primer Simposio de Agricultura Sustentable. Asociación de Estudiantes Agricultores, Recinto Universitario de Mayaguez.
*Sotomayor-Ramírez, D., E. Román-Paoli, L.E. Rivera, Y. Li, and P.J. Stoffella. 2010. Tomato (Solanum lycopersicum L.) response to fertilizer nitrogen and compost. J. Agric. Univ. P.R.
Recaman Serna, A., D. Sotomayor Ramirez, V. Rivera, y G. Lozada. 2009. Técnicas de aplicación de nitrógeno líquido (ULB-35.) en la producción de forraje en Puerto Rico. Manual técnico. En revisión. 18 pp.
Sotomayor Rammrez, D., A. Recaman Serna. 2009. AFOLN_v1, Aplicación Foliar de Nitrógeno Líquido. Modelo. Hoja de cálculo para dosificar la aplicación foliar de fertilizante líquido. Disponible en: http://academic.uprm.edu/dsotomayor/
D. Sotomayor Ramirez, A. Recaman Serna. 2009. ULB-35 Calculator. Modelo. Hoja de cálculo para cuantificar la inyección de fertilizante líquido en sistemas de riego aéreo. Disponible en: http://academic.uprm.edu/dsotomayor/
* Torres, C., T. Ruiz, G.A. Martínez, D. Sotomayor-Ramírez. 2009. Evidence for excess dietary phosphorus on dairy farms with rotational grazing and tropical grasses. J. Agric. Univ. P.R. 93: 23-40.
* Paulino-Paulino, J. E.W. Harmsen, D. Sotomayor-Ramírez, L.E. Rivera. 2008. Nitrate leaching under different levels of irrigation for three turfgrasses in southern Puerto Rico. J. Agric. Univ. P.R. 92: 135-152.
Sotomayor-Ramírez, D. T. Ruiz, D. G. Martínez, Y. Quijano, C. Saavedra and A. Recamán-Serna. 2008. Nutrients in dairy manure sludge in Puerto Rico. Management and implications. 44th Annual Meeting of the Caribbean Food Crops Society. Miami FL, 13-18 July 2008. 44(2): 347-355. DOI: 10.22004/ag.econ.256594
Román-Paoli, and D. Sotomayor-Ramírez. 2006. New fertigation recommendations for cassava on non-traditional production system. Proceedings 42nd Anual Caribbean Food Crops Society Meeting. 9-15 July, San Juan, PR.
* Sotomayor-Ramírez, D., and G. Martínez. 2006. The status of phosphorus and other soil fertility parameters in soils of Puerto Rico. J. Agric. Univ. P.R. 90: 145-157.
* Román-Paoli, E., and D. Sotomayor-Ramírez. 2004. Soil conditioner efficacy on sweet corn production. J. Agric. Univ. P.R. 88: 97-108.
* Sotomayor-Ramírez, D., G.A. Martínez, O. Santana, R.S. Mylavarapu, and J.L. Guzman. 2004. Phosphorus soil tests for environmental assessment in tropical soils. Communications in Soil Science and Plant Analysis. 35: 1485-1503.
Sotomayor-Ramírez, D., S. Ortega-Achury, and E. Mas. 2004. Tropical crop nutrient extraction and salt tolerance database. Final Project Report, under agreement with USDA-NRCS. 43 pp.
* Sotomayor-Ramírez, A. González, E. Román-Paoli. 2003. Yam (Dioscorea spp.) response to fertilization in soils of the semiarid southern coast of Puerto Rico. J. Agric. Univ. P.R. 87: 91-103.
* Sotomayor-Ramírez, D., T. Ruíz, and G.A. Martínez. 2003. Phosphorus balance on dairy farms of Puerto Rico. J. Agric. Univ. P.R. 87: 59-64.
* Sotomayor-Ramírez, D., and R. Macchiavelli. 2002. Interpretations of field fertility research on solanacea in Puerto Rico. J. Agric. Univ. P.R. 86: 95-116.
* Sotomayor, D. and J. Moyá. 2000. Chloride uptake by tropical forage grasses in two soils of Puerto Rico. J. Agric. Univ. P.R. 84: 133-142.
Others
Sotomayor Ramírez, D., R. Rodríguez Pérez, I. Pagán Roig. 2015. Terrenos agrícolas y energía renovable: Caso de estudio Pattern Energy Inc. en Santa Isabel. 2015. Revista de Administración Pública. 45: 1-27. Volumen especial bajo el tema “La Administración Publica de la Energía: Clave para la Sostenibilidad Puertorriqueña”.
Sotomayor Ramírez. D. 2012. Observaciones de los posibles impactos de los molinos de viento sobre los suelos en fincas de Santa Isabel. (Pulse aquí)
Sotomayor-Ramírez, D. and L. Pérez-Alegría. 2011. An assessment of agricultural activities in the eastern portion of the Lajas Valley Agricultural Reserve, within Lajas and Guánica municipalities. University of Puerto Rico, Mayagüez, Agricultural Experiment Station, Unpublished Manuscript. 16 pp, with appendices.
*Dorcinvil, R., D. Sotomayor-Ramírez, J. Beaver. 2010. Agronomic performance of common bean (Phaseolus vulgaris L.) lines in an Oxisol. Field Crops Research (Accepted In Press).
*Ruiz, T.M., Torres-Meléndez, C., Sotomayor-Ramírez, D., Martínez, G.A. 2008. Influence of season and stocking rate on pasture herbage availability and milk yield. J. Agric. Univ. P.R. 92: 15-26.
Ruiz, T.M., M. de L. Lugo, A. Sotomayor-Ríos, R. Rámos-Santana, E. Valencia, and D. Sotomayor-Ramírez. 2007. Release of ‘Henorico’ rhizoma perennial peanut (Arachis glabrata Benth.). J. Agric. Univ. P.R. 91: 81-85.
Sotomayor, D., Z.X. Chen, D.W. Dickson, T. Hewlett, and L.H. Allen, Jr. 1999. Anaerobic soil management practices for nematode control in Florida. Nematropica: 29: 153-170.
Sotomayor, D., and C.W. Rice. 1999. Soil air carbon dioxide and nitrous oxide concentrations in profiles under tallgrass prairie and cultivation. J. Environ. Qual. 28: 784-793.
Ajwa, H.A., C.W. Rice, and D. Sotomayor. 1998. Carbon and nitrogen mineralization in tallgrass prairie and agricultural soil profiles Soil Sci. Soc. Am. J. 62: 942-951.
Sotomayor, D., and C.W. Rice. 1996. Denitrification in soil profiles beneath grassland and cultivated soils. Soil Sci. Soc. Am. J. 60: 1822-1828.
Dodds, W.K., M.K. Banks, C.S. Clennan, C.W. Rice, D. Sotomayor, E. Strauss, and W. Yu. 1996. Biological properties of soil and subsurface sediments under abandoned pasture and cropland. Soil Biol. Biochem. 28: 837-846.
Sotomayor, D., J.E. Corredor, and J.M. Morell. 1994. Methane flux from mangrove sediments along the southwestern coast of Puerto Rico. Estuaries 17, 1B: 140-147. DOI: 10.1016/0038-0717(96)00057-0