A Simple, Cost-Effective Method for Leaf Area Estimation

Table 1

Regression equations and coefficients of determination (𝑅²) between leaf area measured by leaf area meter (𝑦, cm²) and that estimated by millimeter graph paper method (𝑥, cm²) for thirty-three plant species, (𝑛=10 for each species). Observations were made on detached leaves.

S. no.	Species	Month of sampling	Regression equation	𝑅^2
1	Albizia lebbeck	September	𝑌=0.742𝑋+0.741	0.933
	Albizia lebbeck	September	𝑌=0.785𝑋+0.478	0.859
	Albizia lebbeck	October	𝑌=1.093𝑋−1.685	0.986
2	Anacardium occidentale	August	𝑌=0.986𝑋−1.159	0.995
	Anacardium occidentale	September	𝑌=1.000𝑋−2.147	0.991
3	Anthocephalus cadamba	September	𝑌=0.986𝑋−1.495	0.997
4	Artocarpus heterophyllus	October	𝑌=0.984𝑋−0.947	0.998
	Artocarpus heterophyllus	October	𝑌=0.972𝑋−0.894	0.993
5	Artocarpus lakoocha	August	𝑌=1.085𝑋−2.753	0.977
6	Bombax ceiba	August	𝑌=0.955𝑋−0.649	0.993
	Bombax ceiba	October	𝑌=0.961𝑋−0.736	0.996
7	Buchanania lanzan	August	𝑌=0.975𝑋−0.012	0.998
8	Butea monosperma	August	𝑌=0.836𝑋−0.632	0.953
	Butea monosperma	October	𝑌=0.985𝑋−0.952	0.998
9	Cassia fistula	August	𝑌=0.942𝑋−0.321	0.992
	Cassia fistula	September	𝑌=0.988𝑋−1.510	0.997
10	Crescentia cujete	September	𝑌=0.976𝑋−0.426	0.998
	Crescentia cujete	August	𝑌=0.983𝑋−1.458	0.995
11	Diospyros melanoxylon	October	𝑌=0.973𝑋−0.954	0.997
12	Eucalyptus globulus	September	𝑌=0.948𝑋−0.330	0.991
13	Ficus benghalensis	September	𝑌=0.971𝑋−0.763	0.997
14	Ficus carica	August	𝑌=0.986𝑋−1.170	0.994
15	Ficus religiosa	September	𝑌=1.000𝑋−1.879	0.997
	Ficus religiosa	October	𝑌=0.991𝑋−2.296	0.997
	Ficus religiosa	October	𝑌=0.995𝑋−1.863	0.998
16	Hibiscus rosa-sinensis	October	𝑌=0.970𝑋−0.813	0.995
17	Holoptelea integrifolia	August	𝑌=0.982𝑋−1.367	0.998
	Holoptelea integrifolia	October	𝑌=0.962𝑋−0.478	0.998
18	Litchi chinensis	August	𝑌=0.989𝑋−2.009	0.995
	Litchi chinensis	August	𝑌=0.970𝑋−0.816	0.996
	Litchi chinensis	October	𝑌=0.964𝑋−0.862	0.993
19	Madhuca indica	August	𝑌=0.991𝑋−1.925	0.995
	Madhuca indica	October	𝑌=0.990𝑋−1.933	0.998
20	Mangifera indica	August	𝑌=0.997𝑋−1.801	0.998
	Mangifera indica	October	𝑌=0.983𝑋−1.241	0.996
	Mangifera indica	October	𝑌=0.996𝑋−1.177	0.998
21	Melia azadirachta	August	𝑌=1.007𝑋−1.338	0.977
	Melia azadirachta	September	𝑌=1.023𝑋−1.122	0.969
22	Morus alba	August	𝑌=0.973𝑋−0.735	0.996
	Morus alba	September	𝑌=0.978𝑋−0.534	0.998
23	Polyalthia longifolia	August	𝑌=0.966𝑋−0.644	0.998
	Polyalthia longifolia	August	𝑌=0.967𝑋−0.887	0.998
	Polyalthia longifolia	September	𝑌=1.014𝑋−2.366	0.993
24	Populus alba	August	𝑌=0.956𝑋−0.708	0.993
25	Psidium guajava	September	𝑌=0.969𝑋−0.600	0.994
	Psidium guajava	September	𝑌=0.959𝑋−0.634	0.997
26	Sapindus emarginatus	August	𝑌=0.98𝑋−1.097	0.997
	Sapindus emarginatus	September	𝑌=0.967𝑋−0.787	0.989
	Sapindus emarginatus	September	𝑌=0.976𝑋−1.025	0.997
	Sapindus emarginatus	September	𝑌=0.997𝑋−1.474	0.998
	Sapindus emarginatus	August	𝑌=0.987𝑋−1.202	0.992
27	Shorea robusta	August	𝑌=0.97𝑋−0.735	0.997
	Shorea robusta	October	𝑌=0.997𝑋−2.629	0.998
28	Sporadic pinata	August	𝑌=0.959𝑋−0.475	0.995
	Sporadic pinata	October	𝑌=1.024𝑋−3.014	0.996
29	Sterculia colorata	October	𝑌=1.011𝑋−3.651	0.998
	Sterculia colorata	August	𝑌=1.002𝑋−2.912	0.998
30	Syzygium jambolanum	September	𝑌=0.964𝑋−0.065	0.996
	Syzygium jambolanum	September	𝑌=1.002𝑋−1.887	0.997
	Syzygium jambolanum	October	𝑌=0.976𝑋−0.709	0.998
31	Tectona grandis	September	𝑌=0.996𝑋−2.180	0.998
32	Terminalia chebula	October	𝑌=0.979𝑋−0.767	0.998
33	Terminalia tomentosa	August	𝑌=0.977𝑋−0.676	0.997
	Terminalia tomentosa	October	𝑌=0.974𝑋−1.089	0.992

All 𝑅² values are significant at 𝑃<0.0001.