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The effect of coffee grounds on soil properties in a demonstration rice paddy plot, Somdetpittayakom School, Somdet District, Kalasin Province.
Organization(s):Somdetpittayakom School
Country:Thailand
Student(s):Mr. Prakasit Jaboon, Miss Kanyanut Sapa, Miss Chananya Kinaseeta, Miss Siwaporn Kaewsangsee
Grade Level:Secondary School (grades 9-12, ages 14-18)
GLOBE Member(s):Prakaikham Thesarin
Contributors:Miss Prakaikham Thesarin, Miss Sasikarn Phannorach
Report Type(s):Virtual Science Symposium Report
Protocols:Soil Characterization, Soil Fertility, Soil Moisture - Gravimetric, Soil pH, Soil Temperature
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Language(s):English
Date Submitted:2026-01-30
The objective of this research was to study 1) the properties of potting soil mixed with coffee grounds. The research aimed to: 1) compare the properties of potting soil mixed with coffee grounds with potting soil not mixed with coffee grounds; and 2) compare the properties of potting soil mixed with coffee grounds with potting soil not mixed with coffee grounds. The research area was the demonstration rice field at Somdetpittayakom School, Somdet District, Kalasin Province. The study used the GLOBE Protocol to examine soil color, texture, temperature, moisture, pH, and fertility, and recorded the data in a data entry system. The research results showed that the soil in all three plots was clay soil without coffee grounds mixed in. It was yellowish-red in color, hard to the touch, not soft, and could not be molded into a round ball. The soil temperature in plots without coffee grounds mixed in is as high as 35 degrees Celsius. The soil moisture content in plots with coffee grounds mixed in is higher than in plots without coffee grounds. When the soil's pH was tested from the three plots, it was found to be slightly acidic, with values between 5.0 and 6.0, which is suitable for rice cultivation. And when soil fertility was measured, it was found that soil without coffee grounds mixed in had low levels of nitrogen and phosphorus, and moderate levels of potassium.