- 學位論文
轉爐石改良老埤土系土壤性質之研究
A Study on Applying BOF Slag to Improve Properties of Lao-pi Series Soil
摘要
強鹼性之轉爐石應可中和土壤酸性，提升土壤之團粒穩定度，作為酸性土壤之改良資材；且以轉爐石改良酸性土壤之軟弱結構，應能提供水土保持工程用途之新資材。但實際使用礙於轉爐石之化學成分，具有不穩定之膨脹及水合性質，可能減低土壤之透水及通氣度；轉爐石之高碳酸鈣含量，具有水合自硬性可能影響土壤團粒穩定度。 採用密封濕貯之方法進行實驗，每隔月量測轉爐石改良土壤物理及化學性質之成效，顯示以重量百分比0.00 %~1.25 %之轉爐石施用於老埤系酸性土壤，半年後所有貯育成果為： 由於土壤粘粒特性與轉爐石化學反應，貯育配比< 0.75 %之施用量，即使土壤硬化但不等於團粒化，土壤團粒不穩定、通透性及抗蝕性整體表現均差；貯育配比≧1.25 %之土壤結構改善良好較為穩定，增加土壤抗蝕性，但通透性下降可能受化學反應影響，貯育拌合之過程可能為關鍵。 目標成效設定為pH=6.00~7.50，轉爐石貯育施用量≦0.25 %者，皆未達目標；≧0.50 %者均達成目標。土壤電導度隨轉爐石施用量及貯育時程呈正比增加，所有實驗之結果為無鹽度，即對一般作物之生長無鹽害影響。土壤有機質及全氮含量隨轉爐石施用量及貯育時程成反比變化，貯育後所有實驗結果為極低腐植質或低腐植質、低肥力至中等肥力及全氮含量為中常或準豐富等級。
並列摘要
The very strongly alkaline of basic oxygen furnace slag (BOF slag) should be possible to saturate the acid of soil, promote the aggregate stability of the soil, to be a conditioner as acid soil use; improve on the weak structure of acid soil by BOF slag, should be able to provide a new material as soil and water conservation engineering use. Hinder from the chemical composition of BOF slag in actual use, by the instability inflation and hydration, possibly decreases the intrinsic permeability and air permeability of soil; the high calcium carbonate content of BOF slag, with hydration self-hardening, possibly affect the aggregate stability of soil. Uses seal wet incubation the method to carry on the experiment, measure results of BOF slag improve on the physical and chemical property of soil each month, demonstrated employs applying BOF slag by 0.00 %~1.25 % employment quantity by percent of weight to acid soil, after half year all achievement is: As a result by the characteristic of soil clay and chemical reaction from BOF slag, < 0.75% employment quantity, can causes the soil to harden but was not equal to aggregation, unstable soil aggregate, permeability and erosion resistance, all showed not up to standard; ≧1.25% employment quantity, improvement the soil structure to stable, increase the soil erosion resistance, but the permeability drops possibly receives the influence of chemical reaction, the mixes process is possibly the key. Hypothesis the goal result is pH=6.00~7.50, employment quantity of BOF slag ≦0.25%, all has not reached the goal; ≧0.50% achieves the goal. The electric conductivity of soil is in direct proportion the change along with the employment quantity of BOF slag and the incubation time, result of all experimental for does not have the salinity, namely does not have harm influence to the growth of common crops. The content of organic matter and total nitrogen of soil are in reverse proportion the change along with the employment quantity of BOF slag and the incubation time, result of all experimental for the extremely low humus or the low humus after incubation, the low fertility to the medium fertility and the content of total nitrogen for the normal or rich level.