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The effects of simulated acid rain on the yield of Phaseolus vulgaris (green beans).


Herland Emmanuel J. Bertulfo,
Cezanne Louise S. Borromeo,
Daffodils D. Paquibot,
Lovely Angel  B. Tan,
Ellah C. Tiongzon,
Desiderio C. Asane

Related Institution

College of Arts and Sciences – Department of Biology - Cebu Doctors' University

Publication Information

Publication Type
Thesis Degree
Publication Date
November 2017


     This study evaluated the effects of simulated acid rain using sulfuric acid on Phaseolus vulgaris. The study utilized twenty-four (24) drainage pots that were filled with mixed soil. Each pot was planted with six (6) seeds and at the center was a bamboo stick to serve as railing for the growing plants. All pots were randomly assigned into four (4) groups as to three (3) experimental groups and one (1) control group. Each group was correspondingly watered with their designated pH of 1L daily for sixty (60) days until the fruits were harvested. In connection to the investigation, the researchers also collected rainwater from three (3) different places: Cebu, Mandaue and Lapu-Lapu City. The collected rainwater's pH was determined. The initial yield of the fruit was determined through its weight using a weighing scale. Fruits were then sun dried to remove the moisture until a constant weight was obtained. Statistical analysis was not utilized since the data was not sufficient. Instead, the data collected was described qualitatively.

     Plants that were exposed to 4.4 and 4.8 pH level died. The death was due to the damaging effect of the accumulated acid in the soil that has a direct affect to the roots of the plants. Soil having a pH of 5.6 and less is considered acidic. The soil exposed in acidic condition reduced its fertility making the plant loss its capability to produce a fruit, withering of leaves and thinning of stem. However, those plants that were exposed to pH 5.2 produced abnormal fruits with a total average weight of 2.5 grams. The control group which was exposed to pH of 7.0 had a total average weight of 70 grams. Watering the plants consecutively with pH of 4.8 and lower would result to the soil in an acidic condition. As the pH of the soil decreases, the concentration of the hydrogen ion and aluminum increases which results to the decrease in soil fertility that resulted to the difficulty in acquiring the nutrients needed for its growth. Acidic soil leads to reduction of fruit yield and negative effects on the health of the plants; thin stem, crinkled leaves and yellow spots were noticed that turned into browning of leaves which affected the photosynthesis. In this situation, the fruit yield decreases and beans harvested had a smaller size.

     The results concluded that high acidity levels reduced the fertility of the plants. The researches recommend it is important to know at what pH level the green beans survive, other acids may be used to simulate acid rain, use pH values higher than pH level of 4.


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Cebu Doctors' University - Main Library U1 Ef36ber 2017 Fulltext Print Format

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