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頁籤選單縮合
題 名 | 施用石灰於水田的研究=Studies on the Liming of an Acid Paddy |
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作 者 | 陳振鐸; | 書刊名 | 中華農學會報 |
卷 期 | 63 民57.09 |
頁 次 | 頁35-45 |
關鍵詞 | 石灰; 水田; |
語 文 | 中文(Chinese) |
中文摘要 | (一)酸性水田之酸度強弱可利用Lime potential 或?p Al-?p (Ca+Mg) 衡量之,所測定土壤懸液之酸度,在理論上言,尚勝於pH。 (二)水稻之水耕栽培結果顯示培養液中Al3?濃度若相等或超過2ppm時,則對水稻發育發生顯著阻害。而在同一濃度Al3?及同一pH之培養液中水稻根部,較小麥者可能吸收及聚積較多量的Al3?,同時水稻根尚能從濃厚的Al3?溶液中吸收較多量之Al3?。 (三)水田土壤中鹽基飽和度可用土壤懸液之Corrected lime potential 或?p Al-?p (Ca+Mg)以衡量之。 (四)水稻發育與土壤鹽基飽和度或鈣飽和度間有密切關係。試驗結果示:當置換性鈣量相當於置換能量之8~20%時水稻穀收量為最高。 (五)依據本研究結果,擬定酸性水田之石灰需要量測定法之步驟如下:1.經由土壤調查報告書可認定某酸性水田之土系、土型。2.經由土壤調查報告報告告書認定該土壤所含黏土礦物種類。3. 土壤置換能量之測定4. 土壤原有之鹽基飽和度測定。5. 經由田間石灰施用量試驗,可獲得水稻產量最高時,該土壤所示鹽基飽和度或鈣飽和度。6. 由(5)與(4)差額已求出每公頃某深度水田中應施之石灰(CaCO3)量。其中(1)(2)(3)(5)項資料可從有關報告獲得,由于.土壤理化學性質在同一土系中差異不大,故需自行測定者僅(4)項而已。如是求出(6)後,可算出石灰用量。 |
英文摘要 | 1. The strength of acidity of an acid paddy was measured by means of lime potential or ?p Al-?p (Ca+Mg). It was shown that measuring acidity of soil suspension by the two indexes was theoretically superior to pH. 2. Water culture of rice indicated that the growth of rice was significantly impeded when Al3? concentration of the culture medium was greater or equal to 2 ppm. The roots of rice were found absorbed and accumulated greater amount of Al3? than that of wheat, from the culture medium containing higher concentration of Al3? and the same pH. 3. It was shown that base saturation percentage of a paddy soil could be measured through the corrected lime potential or ?p Al-?p (Ca+Mg) of its soil suspension. 4. There was a close relationship between rice growth and base saturation percentage of the soil. The experiment indicated the maximum growth of rice was obtained when exchangeable Ca was 8-20% of the exchange capacity of the soil. 5. Based on the results of this study, a procedure of obtaining lime requirement of an acid paddy is proposesd as follows: 1. Knowing the soil series and type of the acid paddy from the soil survey report of its area. 2. To obtain the information on the clay mineral containe in this paddy through the soil survey report or other publications. 3. Measurement of the exchange capacity of the paddy soil. 4. Measurement of the original degree of base saturation of the paddy soil. 5. Determination of base saturation degree of the paddy, which showed the maximum yield of rice through field experiment. An example of determining lime requirement of a paddy soil through the procedure outlined was described in the paper. |
本系統中英文摘要資訊取自各篇刊載內容。