矽酸爐渣施用對酸性土壤及植體重金屬含量之影響

Effect of Application of Silicate Slag on the Heavy Metal Contents of Acid Soil and Plants

羅秋雄(Chiu-Shyoung Lo)

《桃園區農業改良場研究彙報》 38期 (1999/09) Pp. 15-30

摘要

本研究自1993年至1998年在本場紅壤及新竹酸性砂頁岩沖積土試驗田進行，主要在探討矽酸爐渣施用對土壤重金屬累積量及作物植體（食用部位）重金屬含量之影響，藉以界定矽酸爐渣適宜施用量。試驗處理，包括不施矽酸爐渣（對照）、每年施用矽酸爐渣3 t/ha、隔年施用矽酸爐渣3 t/ha。矽酸爐渣全量於每年秋裡作甘藍時撒施，並與土壤充分混合，第二作不再施用。試驗結果顯示，施用矽酸爐渣對甘藍及水稻具增產效應，青蔥則增產效果不顯著，尤其在軟腐病發生嚴重時甚至造成減產。施用矽酸爐渣可有效提高土壤之pH值約0.5－1.5單位，但會微量增加土壤可萃取性錳之含量，其他重金屬則無明顯影響。作物植體可食用部位之重金屬含量，除錳含量因施用矽酸爐渣而微量降低外，餘則不受影響。

關鍵字

矽酸爐渣 ； 水稻 ； 甘藍及青蔥產量 ； 重金屬含量

並列摘要

Experiments were conducted to determine the effects of application silicate slag on the heavy metal contents of soil and plant during 1993 to 1998 at Tayoung District Agricultural Improvement Station and Hsinchu. Silicate slag was applied at 0, 3 t/ha annually and 3 t/ha biennially. The cropping sequence was rice (in spring), cabbage (in fall) and green onion (in spring). The whole amount of silicate slag was completely mixed with soil before planting the first crop of cabbage.The yield of cabbage and rice was increased by the application of silicate slag, but the yield of green onion was decreased due to the severe occurrence of soft rot. The soil pH value increased by 0.5-1.5 unit in plots applied with silicate slag. Extractable in the soil Mn content also increased slightly. The content of Mn in the plant tissue was slightly decreased with increasing silicate slag application rates.

並列關鍵字

Silicate slag ； Yield of rice ； Cabbage and green onion ； Heavy metal content