What happens when corn silage is delivered at 28% DM? Is the value still $75/ton? What if it’s delivered at 32% DM? (Photo: Catherine Merlo)
How you sample a field of corn silage for dry matter adjustment affects the forage’s price.
With corn silage prices reaching $75 to $95 a ton this summer, it’s a good time to think about your silage goals, says Jennifer Heguy, UCCE Farm Advisor for California’s Merced, Stanislaus and San Joaquin Counties.
Traditionally, corn silage is purchased on a 70/30 basis; that is, 70% moisture and 30% dry matter (DM).
"Let’s assume we’re buying a field for $75/ton," Heguy says. "What happens when the corn silage is delivered at 28% DM? Is the value still $75/ton? What if it’s delivered at 32% DM?"
Heguy shares an equation that can be used to correct the purchase price for DM:
Actual DM% x $/ton = Corrected $/ton
• At 28% DM, the purchase price would be: 28/30 x $75/ton = $70/ton
• At 32% DM, the purchase price would be: 32/30 x $75/ton = $80/ton
"It’s important to remember that as corn matures (DM increases) and starch content increases, fiber quality declines," says Heguy. "This trade-off between starch content and digestibility of forage will affect how the silage is incorporated into rations. It’s also a prime example of why it’s imperative to talk with your nutritionist about your silage goals before making a decision to harvest at a certain DM."
How you sample a field of corn silage for DM adjustment can also have you paying too much or charging too little for corn silage, she adds.
Heguy’s advice? Sample the field often for the best results.