Simple equation of leaf area estimation for Cannabis sativa L.

Abstract

Since cannabis is accepted for medical use in Thailand, it nowadays is increasing experiment for cannabis plantation and medical use. Leaf area is an important information for studying in physical growth. Actual leaf area normally is estimated by using leaf area measurement machine, but it is very high price which is not favor to use for general works. On the other hand, equation from the linear regression model by using width leaf and length leaf is accepted because the information is accepted and the method is not difficult. Moreover, it works without pinching the leaf. This experiment aimed to create the equation for leaf area estimation from width and length of Cannabis sativa L. The result showed that every factor in equation had good R2 which was higher than 0.6812. The equation which used W x L (LA = k (W x L) + a) had the highest R2 (0.9022). The others had lesser R2 such as LA = kL + a (R2 = 0.8316), LA = k (L2) + a (R2 = 0.8114), LA = kW + a (R2 = 0.7252) and LA = k (W2) + a (R2 = 0.6812) respectively. In summary, the equation suited for estimation the leaf area of Cannabis sativa L. without pinching the leaf. 􀀃