Twenty per cent FCM treatment resulted in the highest and most significant increase in fresh weight of lettuce plants during the first and third crop seasons.
Such increase was remarkable during the first crop season when fresh weight of lettuces grown with 20% FCM was approximately double that with other FCM/SSP treatments.
The most significant and highest leaf number, leaf width and leaf length were also observed in 20% FCM-treated lettuces during the first and third crop seasons.