el ▁is ▁grown ▁all ▁over ▁the ▁country ▁but ▁the ▁commercial ▁production ▁of ▁bet el , ▁with ▁bigger ▁leaves ▁with ▁dark ▁green ▁colour ▁combined ▁with ▁thick ness , ▁known ▁as ▁“ kal u ▁bul ath ” ▁is ▁conf ined ▁to ▁a ▁few ▁districts ▁such ▁as ▁Kur un ag ala , ▁G amp aha , ▁K eg alle , ▁Kal ut ara ▁and ▁Col om bo . ▁These ▁are ▁sold ▁at ▁a ▁whole ▁s eller ▁lots ▁of ▁ 1 0 0 0 ▁leaves . ▁In ▁a ▁report ▁published ▁by ▁the ▁United ▁Nations ▁Food ▁and ▁Agricult ure ▁Organ ization ▁( FA O ), ▁a ▁successful ▁bet el ▁farm ▁in ▁Sri ▁L anka ▁can ▁provide ▁a ▁supp lement al ▁income ▁to ▁a ▁far mer ▁by ▁providing ▁six ▁days ▁of ▁work ▁every ▁six ▁months ▁and ▁net ▁income ▁when ▁the ▁leaf ▁prices ▁are ▁attract ive . ▁The ▁FA O ▁study ▁found ▁the ▁successful ▁farm ' s ▁yield ▁to ▁be ▁ 1 8 , 0 0 0 ▁leaves ▁per ▁. ▁The ▁additional ▁sal ary ▁and ▁income ▁to ▁the ▁Sri ▁L ank an ▁bet el ▁gro wer , ▁assuming ▁he ▁or ▁she ▁provides ▁all ▁needed ▁labor ▁and ▁keeps ▁all ▁net ▁profit , ▁to ▁be ▁SL ▁R s . ▁ 1 6 3 5 ▁per ▁ ▁of ▁bet el ▁farm ▁every ▁ 6 ▁months ▁($ 9 0 ▁per ▁" dec imal " ▁per ▁year , ▁or ▁$ 9 0 0 0 ▁per ▁a cre ▁per ▁year ). ▁If ▁the ▁far mer ▁h ires ▁outside ▁labor ▁to ▁tend ▁the ▁bet el ▁v ines