Silviculture and Productivity (S&P) research programme:	With	the	acquisition	of	the	first	farms,	new	 challenges	appeared	such	as,	how	many	trees	to	plant,	 how	to	prepare	the	land,	when	and	how	often	to	control	 the	weeds	and	how	to	supply	additional	nutrients	to	 preserve	or	amplify	the	growth	potential	obtained	 through	genetic	improvement.