▁soil ▁is ▁p low ed ▁into ▁fur rows ▁of ▁ 1 0 ▁to ▁ 1 5 ▁metres ' ▁length , ▁ 7 5 ▁cent imet res ▁in ▁width ▁and ▁ 7 5 ▁cent imet res ' ▁depth . ▁O il ▁c akes , ▁man ure , ▁and ▁leaves ▁are ▁thoroughly ▁incorpor ated ▁with ▁the ▁to ps o il ▁of ▁the ▁fur rows ▁and ▁wood ▁ash . ▁The ▁c utt ings ▁are ▁plant ed ▁at ▁the ▁beginning ▁of ▁the ▁mon so on ▁season . ▁ ▁Pro per ▁sh ade ▁and ▁ir rig ation ▁are ▁essential ▁for ▁the ▁successful ▁cultiv ation ▁of ▁this ▁c rop . ▁Bet el ▁needs ▁constantly ▁mo ist ▁soil , ▁but ▁there ▁should ▁not ▁be ▁excess ive ▁mo ist ure . ▁Ir rig ation ▁is ▁frequent ▁and ▁light , ▁and ▁standing ▁water ▁should ▁not ▁remain ▁for ▁more ▁than ▁half ▁an ▁hour . ▁ ▁D ried ▁leaves ▁and ▁wood ▁ash ▁are ▁applied ▁to ▁the ▁fur rows ▁at ▁fort night ly ▁intervals ▁and ▁cow ▁d ung ▁sl ur ry ▁is ▁spr ink led . ▁Application ▁of ▁different ▁kinds ▁of ▁leaves ▁at ▁month ly ▁intervals ▁is ▁believed ▁advantage ous ▁for ▁the ▁growth ▁of ▁the ▁bet el . ▁In ▁three ▁to ▁six ▁months ▁the ▁v ines ▁reach ▁ 1 5 0 ▁to ▁ 1 8 0 ▁cent im eters ▁in ▁height ▁and ▁they ▁will ▁branch . ▁Har vest ▁begins , ▁with ▁the ▁far mer ▁pl uck ing ▁the ▁leaf ▁and ▁its ▁pet io le ▁with ▁his ▁right ▁thumb . ▁The ▁har vest ▁last s ▁