What did the abbriviation"SPAD" derived from?

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Seied Mehdi Miri

Hello

SPAD stands for Soil Plant Analysis Development.

Ali Alhayany

I think that there is another alternate statement.

Regards

I saw this definition in several references, including the following article.

I agree with you and i read this on the leaflet combined with SPAD system , but i read another one in a published article i lost it.

Great thanks for cooperative

Alhayany