agricultural productivity productivity agricultural productivity produce economically crop efficiency agricultural productivity output per farmer has multiplied twelvefold crop productivity crop efficiency agricultural productivity agricultural productivity agricultural productivity ניתן לראות עלייה קבועה בפריון כבר לאורך עשרות שנים produce economically crop efficiency agricultural productivity crop efficiency agricultural productivity crop efficiency productivity agricultural productivity agricultural productivity Agricultural productivity agricultural productivity agricultural productivity boom crop ניתן לראות עלייה קבועה בפריון כבר לאורך עשרות שנים agricultural productivity agricultural productivity agricultural output agricultural productivity Land productivity boom crop agricultural productivity agricultural productivity http://en.wikipedia.org/wiki/Agricultural_productivity agricultural productivity agricultural productivity crop efficiency agricultural productivity