頁籤選單縮合
題 名 | Urease Activity in Taiwan Cane Field Soils and Their Relationships to Soil Properties [fec1],[feb4],[fed5] |
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作 者 | 蔡正勝; | 書刊名 | Taiwan Sugar |
卷 期 | 46:4 民88.07-08 |
頁 次 | 頁7-13 |
分類號 | 434.717 |
關鍵詞 | Soil properties; Subtropical; Urea; Urease; |
語 文 | 英文(English) |
英文摘要 | Urea used as a nitrogen source for crop production has shown marked increase in recent years. Because urease controls the hydrolysis rate of urea and affects urea efficiency, it is important to estimate urease activity (UA) in subtropical soils and determine the relationships between soil properties and UA. UA in topsoil subsamples from 24 cane field soils located at central and southwest parts of Taiwan, including a wide range of physicochemical properties, were investigated. Values of UA ranged from 3.6 to 44.7 μg urea-N hydrolyzed g□ soil h□, with a mean value of 20.9±7.6. Simple correlation analyses showed that UA was significantly (P 0.001) correlated with exchangeable K (r = 0.6290), available K (r = 0.6199), OM(r = 0.6120), available P (r = 0.5987), and exchangeable Ca (r = 0.5869). Significant correlation (P < 0.01) was also found between UA and properties, total N (r = 0.5302), CEC (r = 0.5235), silt (r = 0.5128), clay (r = 0.4833), and sand contents (r = -0.5233). Variability from 39.1 to 78.5% in UA could be explained by multiple-regression equations involving parameters: silt content, available P, and exchangeable cations: K and Na. |
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