|Title:||由葉綠素測計估測和追蹤稻株之葉綠素及氮素狀態||Other Titles:||Using Chlorophyll Meter to Estimate and Monitoring Leaf Chlorophyll and Nitrogen Status in Rice Plants||Authors:||楊純明
|Keywords:||水稻;葉綠素測計;葉綠素總量;氮素含量;Rice;Chlorophyll meter;Total chlorophyll;Nitrogen content||Issue Date:||Sep-2003||Publisher:||農業試驗所||Related Publication(s):||農業試驗所特刊第105號||Start page/Pages:||89-96||Source:||水稻精準農業體系||Conference:||水稻準農業(耕)體系之研究計書成果研討會||Abstract:||
本研究調查2000 年二期稻作至2002 年一期稻作（計二年四期作）之水稻生育期間稻株葉片葉綠素及氮素含量，配合以葉綠素計讀值的量測，試以建立葉綠素計讀值與葉綠素及氮素之關係式，利用於估測和追蹤稻株之葉綠素及氮素狀態。試驗發現以不等量氮肥的施用將影響稻株之葉片之葉綠素總量及氮素含量，但是在相同等級下葉片之葉綠素總量、氮素含量或葉綠素計讀值均隨著稻株生育而呈現下降趨勢。稻株葉片之氮素含量與葉綠素總量可以直線正相關表示，一、二期稻作皆然，且兩期稻作資料可以合併分析，兩變數之間仍為顯著直線正相關。試驗分析亦顯示，稻株葉片之葉綠素總量與葉綠素計讀值之關係可適用於直線相關，一、二期稻作之決定係數（R2）分別為0.758及0.862，其合併分析亦為顯著直線正相關。在葉片氮素含量與葉綠素計讀值的關係上，無論期作均為顯著直線正相關，一、二期稻作之決定係數分別為0 . 574 及0.439，合併分析產生兩期稻作共用的迴歸方程式州為0.411(P<0.0001）。根據試驗結果，本研究採用的水稻品種臺農67 號，建議可以利用葉綠素計讀值估測和追蹤稻株葉片之葉綠素與氮素狀態。
Field experiments were conducted at Taiwan Agricultural Research Institute Experimental Farm, Wufeng to investigate changes of leaf total chlorophyll and nitrogen content as well as values of chlorophyll meter for rice plants (Oryza sativa L. cv. TNG 67) grown from the 2¡¦ crop of 2000 to the 2nd crop of 2002. Results showed that leaf total chlorophyll and nitrogen content were decreased after transplanting in both cropping seasons, and values of chlorophyll meter followed the trend as these two components. Similar patterns were found between different amounts of nitrogen fertilizer treatments. Relationship between leaf total chlorophyll and nitrogen was significant linearly, in either crops as well as in pooled data from both crops. The values of chlorophyll meter and leaf total chlorophyll were linearly correlated in both the first and the second crops, and also in pooled data from both crops. Accordingly, relationship between leaf nitrogen content and chlorophyll meter readings was analyzed and was shown a significant linear relationship in both cropping seasons. The pooled data from two crops were also fitted to a linear regression model. Results suggest that leaf chlorophyll and nitrogen content can be estimated and monitored by chlorophyll meter in rice cultivar TNG 67.
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