The Leaf Index (IDF) is an operational method developed by researchers at Imperial College London to determine the impact of air pollution on a plant's leaves.
The single leaf is identified numerically and followed in time by assigning an index to it a relationship to the spread of necrosis. Calculate wikitesto
IDF = Σ. N. ( D t –D t-1 ) / N
where: n = progressive leaf number from bottom to top; N = total number of evaluated leaves; Dt = leaf damage at the end of the considered week; Dt-1 = leaf damage at the end of the previous week. Links externalize the wikitesto
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