It's the concentrated amount of urea that will kill, not the diluted amount that is added to silage. Urea will be diluted as it is added to silage, thus making it not toxic and edible for cattle to eat.
The spelling "silage" is used for livestock feed made from fermented alfalfa, oats, or maize.
Silage is high-moisture and high-nutrient, which makes it optimal for feed (but is easily spoiled if oxygen is allowed into the storage silo) Silage is also used in anaerobic digestion, where the silage is fed to anaerobic digesters such as Methanosarcina and A. wodii to harvest biogas, which can be then used to generate electricity and heat.
If the silage is exposed to any amount of oxygen, there is high potential for spoilage. When silage is spoiled, it cannot be used for livestock. Thus silage cannot be stored just anywhere, it must be stored in such a way that no oxygen is able to get into it. That enables the anaerobic bacteria to do their job and keep the silage as unspoiled as possible.
Sulfur is not removed from molasses. If you have seen molasses bottles that say "unsulphured" (old-fashioned spelling), it means that sulfur dioxide was not used in processing the molasses. Most molasses today is unsulfured.
Making rum.
Silage making is the process by which green/immature plants are harvested, stored and allowed to ferment for the purpose of feeding the fermented vegetation to livestock. This feed was originally loaded into silos to allow to ferment, but today can also be stored in large sealed plastic bags.
In a silage pit or as bales
Molasses was important mainly because it was used to make rum.
The tall, cylinder shaped farm structures , that are used to store silage.
When we eat hot dogs and beans, my mother will add molasses to the beans to make them taste better.
The farmer fed silage to the pigs.