date:Nov 07, 2012
d alfalfa fields never get much water below 4 feet deep, but alfalfa can develop roots down 8 feet or more, Anderson says. You waste some of the water collection ability of alfalfa by not building water reserves below 4 feet. Don't waste this ability. That water reserve will keep your alfalfa growing rapidly during next summer's heat and allow you to irrigate on a more timely basis.
Since many alfalfa soils have low water infiltration rates, irrigating now may be the only time you can build tha