Evaluation of activated biochar versus organic amendments in an Oxisol (Dagüey series) of Puerto Rico and their effect on soil health and growth of Phaseolus vulgaris

dc.contributor.advisor Sánchez de León, Yaniria Rodriguez Torres, Paola Marie College of Agricultural Sciences en_US
dc.contributor.committee Sanfiorenzo Gil De Lamadrid, André R.
dc.contributor.committee Dumas, José A.
dc.contributor.department Department of Crops and Agro-Environmental Sciences en_US
dc.contributor.representative Zapata Medina, Rocio 2022-05-26T19:24:27Z 2022-05-26T19:24:27Z 2022-05-19
dc.description.abstract Soil organic amendments have been wieldy used to restore soil health. The main objective of this research was to evaluate the short-term effects of three organic amendments (compost, compost tea and active biochar), on a tropical soil (Dagüey series) planted with white bean seeds. The study had four treatments (i.e. control, compost, active biochar and compost tea) and followed a completely randomized design with four replicates. Changes in soil properties and plant growth were measured at the beginning of the experiment and at the end of the white bean life cycle (90 days). Short term effects on soil health was evaluated analyzing selected chemical, physical and biological properties. Plant growth was analyzed using the aboveground biomass and root biomass. Immediately after the addition of organic amendments soil pH was directly affected. The addition of active biochar showed a significant increase in soil pH after 90 days. However, compost tea addition showed a significant reduction in soil pH because of amendment components. Results of microbial biomass and composition showed that changes on biological properties are directly related to changes in soil pH. A significant reduction in microbial biomass was observed after the addition of organic amendments. Compost tea treatment resulted in reducing overall microbial biomass, which was directly related to a decrease in soil pH. For plant growth, no significant differences among treatments were observed. Testing on the 90-day period showed significant difference in soil properties only. Amendments like biochar can increase soil pH immediately, presenting a new alternative to neutralize pH in tropical acidic soils. en_US
dc.description.abstract Las enmiendas orgánicas del suelo se han utilizado ampliamente para restaurar la salud del suelo. El objetivo principal de esta investigación fue evaluar los efectos a corto plazo de tres enmiendas orgánicas (compost, té de composta y biocarbón activado), en un suelo de la serie Dagüey sembrado con semillas de frijol blanco. El estudio tuvo cuatro tratamientos (control, composta, biocarbón activado y té de composta) y siguió un diseño completo al azar con cuatro repeticiones por tratamiento. Los cambios en las propiedades del suelo y el crecimiento de las plantas se midieron al inicio del experimento y al final del ciclo de vida del frijol blanco (90 días). Se evaluaron los efectos a corto plazo sobre la salud del suelo analizando propiedades químicas, físicas y biológicas. El crecimiento de las plantas se analizó utilizando el crecimiento superficial y radicular. Inicialmente la adición de enmiendas orgánicas afectó directamente el pH del suelo. Después de 90 días, el pH del suelo tuvo un aumento significativo con la adición de biocarbón activado. Los resultados de la composición y biomasa microbiana mostraron que los cambios en propiedades biológicas están directamente relacionados con cambios drásticos en el pH del suelo. Se observó una reducción significativa en la biomasa microbiana después de la adición de enmiendas orgánicas. El crecimiento de la habichuela blanca no presento diferencias significativas en su crecimiento superficial y radicular luego de la adición de enmiendas orgánicas. Luego de 90 días únicamente las propiedades químicas, físicas y biológicas del suelo presentaron diferencias significativas entre los tratamientos. El pH y propiedades de las enmiendas orgánicas están asociadas a cambios a corto plazo en el suelo. En especial las enmiendas como el biocarbón pueden aumentar el pH del suelo de inmediato, presentado una alternativa para neutralizar el pH en suelos ácidos tropicales. en_US
dc.description.graduationSemester Spring en_US
dc.description.graduationYear 2022 en_US
dc.description.sponsorship This project was partially financed by the Project of the UPRM Experimental Agricultural Station Integrating soil education with organic agriculture at the University of Puerto Rico-Mayagüez using experimental learning, (USDA NIFA, Resident Instruction Grants Program Award No. 2018-70004-28684, Project Z-332 of the UPRM Experimental Agricultural Station). In addition to project titled Reimagining Puerto Rico’s Energy and Food Systems Through Community Engagement and Industrial Symbiosis from the University of Michigan. Further financial and logistical support was provided by de Department of Agro-environmental Sciences at the University of Puerto Rico-Mayagüez. en_US
dc.language.iso en en_US
dc.rights Attribution-NonCommercial-NoDerivs 3.0 United States *
dc.rights.holder (c) 2022 Paola Marie Rodriguez Torres en_US
dc.rights.uri *
dc.subject Soil Health en_US
dc.subject Biochar en_US
dc.subject Organic amendments en_US
dc.subject Plant growth en_US
dc.subject.lcsh Biochar - Puerto Rico en_US
dc.subject.lcsh Organic fertilizers - Puerto Rico en_US
dc.subject.lcsh Soil remediation - Puerto Rico en_US
dc.subject.lcsh Climate change mitigation - Soils - Puerto Rico en_US
dc.subject.lcsh Organic wastes as soil amendments - Puerto Rico en_US
dc.title Evaluation of activated biochar versus organic amendments in an Oxisol (Dagüey series) of Puerto Rico and their effect on soil health and growth of Phaseolus vulgaris en_US
dc.type Thesis en_US
dspace.entity.type Publication Soil Sciences en_US M.S. en_US
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