| dc.description.abstract | The purpose of this research was to study the temperature of burning surf clam
shell for soil quality improvement. The experiment was divided two parts, 1) the study
of the optimum temperature for calcium oxide production by burning 800, 900, 1,000
and 1,100 °C, 2) the study of using calcium oxide to improve soil qualities of acidic soil
and saline soil. The parameters used in the analysis included elements of soil particles,
soil moisture, pH, conductivity, total content nitrogen, phosphorus and potassium. The
results showed that the optimum temperature for the production of calcium oxide
was 1,100 °C since it provided the highest calcium oxide content of 90 % by weight.
After applying calcium oxide into acidic soil the composition of soil particles was
changed from sandy clay to sandy clay loam. In contrast, the soil particle was not
changed but the proportion was changed in saline soil. It was also found that calcium
oxide reduced soil moisture and influenced the acidity of soil by increasing the pH
from 3.39 to 6.92 in acidic soil, and 6.49 to 9.11 in saline soil. In addition, it was found
that the electrical conductivity of the soil was related to salinity. In acidic soil, the
conductivity of before and after inputting calcium oxide were 0.87 and 1.24 dS/m,
respectively. In the case of saline soil, the conductivity of before and after
improvement were 14.37 and 18.80 dS/m, respectively. Besides, it was found that the
total content of nitrogen, phosphorus and potassium were reduced after the
experiment. | en_US |
