查詢結果分析
來源資料
相關文獻
- Soil Crust Impedance and Critical Penetration Distance (1)--Measurement Method
- Soil Crust Impedance and Critical Penetration Distance (2)--Effects of Initial Soil Moisture Content, Compaction and Drying Rate
- Development of a Field Penetrometer For Measuring the Impedance of Soil Crusts Upon Emerging Seedlings
- Accumulation of Heavy Metals in Two Crop Seeds due to Soil Contamination as Determined by Neutron Activation Analysis Techniques
- 中距離賽跑與能量需求
- 機臺模擬剎停距離量測簡介
- 路基土壤回彈模數三軸試驗系統量測不確定度評估
- 微邊際電容感測器的設計與製作
- 球體沿光滑斜面滾動之終端速度與其到達終端速度所需的距離
- 土壤特性對稻米品質之影響(3)--土壤理化性質對米飯品質之影響
頁籤選單縮合
題 名 | Soil Crust Impedance and Critical Penetration Distance (1)--Measurement Method=土壤表殼阻力與關鍵穿透距離(1)--量測方法 |
---|---|
作 者 | 朱元南; | 書刊名 | 農業工程學報 |
卷 期 | 38:4 1992.12[民81.12] |
頁 次 | 頁68-79 |
分類號 | 434.222 |
關鍵詞 | 土壤; 表殼; 阻力; 穿透; 距離; 量測; |
語 文 | 英文(English) |
中文摘要 | 本文提出了關鍵穿透距離是除了土壤表殼阻力外,另一個影響種苗發芽出土的重要因素,並利用由下而上穿透的機械探針,建立了同時量測以上兩種因素的方法。實驗所觀察之表殼阻力機構包括圓錐剪斷與圓頂突出。隨著表殼之乾燥,表殼阻力機構亦由以圓錐剪斷為主改變以圓頂突出為主。表殼土壤潮濕時探針頭的增大會增加阻力,但是表殼乾燥時探針頭的大小不影響阻力。探針穿透速度由1至20 cm/s範圍內的變化不影響表殼阻力。乾燥過程中表殼阻力隨時間及土壤的乾燥而增加。關鍵穿透距離亦隨著表殼之乾燥而增加。口袋型阻力計所量測之表殼阻力比用向上穿透的探針所量得者大,但兩者具良好的相關性。 |
英文摘要 | The critical penetration distance has been suggested in this report as another important factor, besides the crust impedance, that influences seeding emergence through the soil crust. A laboratory method for measurement of these two factors was developed using a mechanical probe penetrating from below the crust. Observed crust braking mechanisms were primarily cone-shear when the crust was moist and shifted to dome-formation as the crust became dry. An increase in the probe size increased the measured impedance when the crust was moist, but the influence of probe size was insignificant when the crust dried. The effect of probe speed was not statistically significant for probe speeds from 1 to 20 cm/min. Crust impedance increased significantly with the drying of the crust. The critical penetration distance also increased as the crust dried. Crust impedance measured by a pocket type penetrometer correlated well with that measured by the upward penetrating probe. However, the pocket penetrometer tended to overestimate the impedance. |
本系統中英文摘要資訊取自各篇刊載內容。