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[49卷4期] 氮肥施用對地毯草生育之影響與應用葉綠素計於氮素狀態診測之探討

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分享作者: TSHS 發表於 2013-8-10 01:00:25 |顯示全部樓層

文章名稱(中文): 氮肥施用對地毯草生育之影響與應用葉綠素計於氮素狀態診測之探討
英文名稱: The Effect of Nitrogen Fertilization and the Application of Chlorophyll Meter to Evaluate the Nitrogen Status on Axonopus compressus (Swartz) Beauv.
作者(中文): 鍾翊嫻、 張育森
作者(英文): 鍾翊嫻(Yu-Shian Chung); 張育森(Yu-Sen Chang)
卷期: 49卷4期
頁次: 361-374
中文摘要: 本試驗擬探討氮肥施用對地毯草(Axonopus compressus (Swartz) Beauv.)生長之影響,以及葉綠素計應用於其氮素狀況診測之可行性。地毯草之株高、葉長、生長葉數均隨氮肥施用量增加而增加。CMR和葉片葉綠素含量(mg/g)具有顯著之線性相關(r2>0.94, p<0.001)。CMR和葉片氮含量之線性迴歸分析,於秋冬季試驗(1997/8/30~ 1997/12/30)、春季試驗(1998/3/28 ~ 1998/5/25)期間均呈極顯著(r2>0.70,p<0.001)。葉片之長寬比值(Leaf L/W)、CMR 3/1會隨氮肥施用量增加而提高,且和葉片氮含量(%)呈顯著之迴歸相(r2>0.77,p<0.001),若以此Leaf L/W、CMR 3/1作為生長指標之依據,冬季試驗可訂出氮素臨界濃度為1.85~3.41%,其對應之CMR值依次為32.0~48.4;春季試驗之氮素臨界濃度為3.52~4.08%,其對應之CMR值為39.0~43.0。初步以此CMR值作為氮素臨界濃度,可利用葉綠素計之診測,判斷氮素營養狀況,作為肥培管理之參考依據,達到快速診斷之目的,並可提高氮肥之
利用效率。
英文摘要: Nitrogen fertilization is one of the most important practices in turfgrass management. Since the methods of diagnosing nitrogen status presently used are time-wasting and destructive. There is an immediate need to develop a convenient, rapid, and reliable tool for improving nitrogen fertilizer management. Chlorophyll meter reading (CMR) is directly related to leaf chlorophyll concentration (chl.), and leaf chl. is often well correlated with leaf nitrogen content (N.). Therefere CMR may serve as a surrogate for leaf N and assist in prediction of nitrogen requirement for crops. The objectives of this research are to (1) determine the relationship among CMR, leaf chl., and leaf N, (2) determine the feasibility of using a chlorophyll meter for evaluate nitrogen status, (3) determine the critical range of nitrogen for tropical carpetgrass (Axonopus compressus (Swartz) Beauv.). In the first experiment (1997.8.30~1997.12.30), nitrogen fertilizer (NH4NO3) was applied at the rates of 0.0, 2.5, 5.0, and 10.0 gN/m2/mo. The plant height, leaf length, and number of leaf
were increased with nitrogen fertilizer increasing in both turfgrasses. In the second experiment (1998.3.28~1998.5.25), the nitrogen was applied at the rates of 0.0 (gN/m2/mo), 0.0+Os(Osmocote 6g/pot), 2.5+Os, 5.0+Os, and 10.0+Os to determine the effect of slow release fertilizer. The tropical carpetgrass plants with 5.0+ Os and 10.0+Ostreatments had heigher growth rate. The plant height, growth rate, leaf length, number of tiller. and shoot dry weight of the four treatment plants with slow release fertilizer were significantly increased when compared to that of control plants (no nitrogen treatment). There was a significantly positive linear correlation between CMR and leaf chl. in tropical carpetgrass (r2=0.95, p<0.001). The CMR was also well related to leaf N (r2=0.85, p<0.001). In addition, the ratios of CMR 3/1 (The CMR of third fully expanded leaf/ The CMR of first fully expanded leaf) and ratios of leaf L/W (length/width) also had well relationship with leaf N. According to the regressions of CMR 3/1, leaf L/W and leaf N, the critical range of nitrogen was made from the N of CMR 3/1=1 to the N of the largest leaf L/W. Thus, in the first experiment the critical ranges of nitrogen in tropical carpetgrass were 1.86~3.41%, and the critical ranges of CMR were 32.0~48.4. In the second experiment, the critical ranges of nitrogen were 3.52~4.08%, and the critical ranges of CMR were 39.0~43.0. Based on the results, it is possible that chlorophyll meter can be a rapid, convenient, and reliable tool to diagnosing of nitrogen status in turfgrasses.
關鍵字詞: 地毯草、氮素、緩釋肥、葉綠素計、葉綠素計讀值;Axonopus compressus (Swartz) Beauv, nitrogen, slow release fertilizer,
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