--Too bad it is in French.
http://www.cybersciences.com/Cyber/3.0/N1513.aspthat

But roughly it is about the fact that they deducted from old remains in
syrie  the evidences of grain growing 13ooo years ago, because of a drought
that limited the supply of wild grains allready eaten by hunter gatherers in
that part of the world.
that  sudden drought will have lasted 1000 years and could have happened in
less than 10 years period So they just started to plant the wild seeds
growing wild on the hills at the bottom of the hills to benefit from the
accumulated moisture.
In the older layers of the site the grains were small indicating wild grain
but around 13000 they became big showing the domestication of it.
because the grains doesn't compete very well with the natural vegetation of
this specific ecosystem, loving care were needed to help the grain ( weeding
...)
agriculture was born.
jean-claude