"We've all heard the stark anecdotes: precious topsoil weakened by over-farming, dust clouds darkening the Asian skies, parched land becoming desert and rivers running dry, " said Mr Grice.

Dry land rice growing is the primary production activities of Landian Yaos high land shifting farming.

Fully raising rainfall use efficiency of farm-land is the basis of high efficient utilization to limited water in dry-land farming.