Ador, Samantha L. <br/><br/>
Bioassay based assessment of allelopathic effects of mahogany (swietenia macrophylla) and soil quality parameters in angat, bulacan/ 
Samantha L. Ador, Fretzie Catherine N. Almonte, Crisostomo D. Bautista, and Rose Mae R. Umali.-- 
 - Manila:  Technological University of the Philippines,  2025. 
 - v, 169pages:  29cm. 
<br/><br/> Bachelor's thesis<br/> 
<br/><br/>College Of Science.--<br/> 
<br/><br/>Includes bibliographic references and index. 
<br/><br/> This study investigates the relationship between soil quality parameters,<br/>allelopathic properties, and management strategies for Mahogany (Swietenia<br/>macrophylla) in Angat, Bulacan. The research focuses on characterizing the soil quality<br/>(pH, Nitrogen, Phosphorus, Potassium, Organic Matter, and Moisture Content) in<br/>correlation to the phytochemical concentration (Tannins and Phenols) and developing a<br/>management strategies for sustainable use of Mahogany and soil management guidelines.<br/>Bioassay experiment were conducted to assess the allelopathic effects of Mahogany on<br/>selected crops, including corn (Zea mays), black-eyed peas (Vigna unguiculata), long<br/>chili (Capsicum annuum), and tomato (Solanum lycopersicum). Findings revealed that<br/>the soil in the Mahogany grove was slightly acidic 5. 304pH and low content of essential<br/>macronutrientsーNPK with a mean value of 0.0935ppm, 0.3894ppm, 193.578 ppm<br/>respectively and organic matter with the amount of 0.0196% . This suggests reduced<br/>microbial activity and weak nutrient cycle which potentially limits the growth and<br/>mortality of the neighboring plant species. Phytochemical analysis found a significant<br/>increase in tannins and phenols during the shedding season (March) with a value<br/>increased from 0.02% to 61.7 % for phenols and 0.13% to 21.81% for tannins , this<br/>indicates an enhanced allelochemical activity due to seasonal variation in allelopathic<br/>potential. The study revealed that the bioassay demonstrates mahogany’s allelopathic<br/>effects on plant species with sensitive crops observed inhibiting growth and high<br/>mortality rates except the black-eyed pea which exhibit resilience. Statistical analysis<br/>highlights a significant correlation between soil quality parameters and phytochemical<br/>concentrations in developing a propagation of optimum soil management practice and<br/>management strategies for sustainable use of Mahogany plantation. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Swietenia macrophylla<br/>Environmental activities<br/> Soil quality parameters
<br/><br/><label>LC Class. No.: </label>BTH GF 41  / A36 2025