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The average AtLeaf chlorophyll index reading of the penultimate leaves was closely correlated to the tissue N concentration of those leaves and served as a good predictor of the eventual protein content of the grain.

M. Lundy, S. Wright, Farm Advisor, S. Orloff, UC Cooperative Extension; R. Hutmacher , UC Cooperative Extension Specialist, UC Davis Plant Sci. Dept. and Director, UC West Side REC;

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