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SPAD and atLEAF values were strongly correlated and not affected by the different measurement conditions. The atLEAF Chl meter can therefore be used as an inexpensive alternative to the SPAD-502 meter, although the latter was found to be easier to handle.

Juanjuan Zhu¹, Nicolas Tremblay², and Yinli Liang^1,3
1College of Life Sciences, Northwest AF Univ., China; 2Horticulture Research and Development Centre, Agriculture and Agri-Food Quebec, Canada; and 3Institute of Soil Water and Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling, P.R. China.

Rubber leaves index values observed by SPAD- 502 and atLEAF CHL PLUS were closely correlated, hence both of the devices can substitute each other. In addition, the correlation between atLEAF CHL PLUS and SPAD-502 values with absolute chlorophyll content of clone SP 217, PB 260, GT1, and all clones (general) were significant with a high coefficient of determination (R2) as well as low RMSE and CV. Therefore, both atLEAF CHL PLUS and SPAD-502 can be used to make fast and nondestructive prediction of chlorophyll content of rubber plant leaf.

A N CAHYO^1)2)*), R H MURTI²⁾, E T PUTRA²⁾, T R NURINGTYAS³⁾, D FABRE⁴⁾ , P MONTORO⁴⁾
1) Pusat Penelitian Karet, Palembang 2)Fakultas Pertanian UGM, Sleman, Yogyakarta 3)Fakultas Biologi UGM, Jl. Teknika Selatan,Sleman, Yogyakarta 4)CIRAD, UMR AGAP, Montpellier, France