在台南市砂頁岩沖積土(砂質壤土，pH6.2-6.5)及溪州鎮粘板岩沖積土(砂質壤土，pH7.5), 自種植後第二年開始，連續進行三要素適量試驗三年之結果，在同時施用堆肥每10公畝3噸之條件下，綠蘆筍化學肥料之N-P2O5-K2O 經濟用量為：台南試地第二年生30-7.5-0 kg/10a(產量最高之施用量為90-7.5-0)，第三年生90-7.5-15kg/10a(產量最高者為90-22.5-45)，第四年生亦為90-7.5-15kg/10a(產量最高者90-7.5-15，第三、第四年生90-0-0)。溪州試地之三要素經濟量與高雄區農業改良場發表之里港試地結果相同。由三處情形可知，綠蘆筍經濟施肥量依地點而有相當大的差異，N經濟量，第二年生均為30kg/10a，第三、第四年生範圍為30-90kg/10a，一般似在30-60kg/10a；P2O2經濟量為0-7.5kg/10a；K2O經濟量為0-15kg/10a。 Under the conditions where 3 metric tons of compost were applied per 10a, the highest yield of spears was obtained with applications of N-P2O5-K2O at the rates of 90-7.5-0kg/10a in the 2nd year after planting, 90-22.5-45 in the 3rd year and 90-7.5-15 in the 4th year at the experimental field at Tainan. However, the economical retes were 30-7.5-0kg/10a in the 2nd year, 90-7.5-15 in the 3rd and 4th years. The soil in the Tainan field is a slightly acid sandstone/shale alluvial soil having a sandy loam texture. In another experiment located at Hsichow on a slightly alkaline slate alluvial soil having a sandy loam texture, the highest yield of spears was obtained with applications of N-P2O5-K2O at the rates of 90-0-15kg/10a in the 2nd year after planting, 90-0-0 in the 3rd year and the 4th years. However, the economical rates were all 30-0-0 in the 2nd, 3rd and the 4th years. The economical rates at Hsichow coincides with those at Likang which were reported by the Kaohsiung Agricultural Improvement Station.
Experiments on the Fertilizer Rates for Green Asparagus