Fertility
Please check our fertility page for recommended fertility levels.
Prussic Acid Control
Common forages such as alfalfa,
clovers and cool-season perennial grasses do NOT produce toxic compounds after a
frost and can be fed safely. The only concern is a slightly higher potential for
bloat when grazing legumes within a day or two after a killing frost.
Sudan Grass
Sudangrass and sorghum-sudan grass hybrids contain a compound called dhurrin.
When the plant tissue is frozen, enzymes in the plant convert dhurrin into
hydrocyanic acid or hydrogen cyanide, also referred to as prussic acid.
Sudan grass and sorghum-sudan grass hybrids require 28 degrees F for a killing
frost, but even a light frost requires special management. When a large amount
of the substance is consumed in a short period of time by ruminants, the dose
can be lethal. The prussic acid potential is higher in the early stages of
growth, but decreases until fall.
Alfalfa
Alfalfa is a perennial forage legume which normally lives
4–8 years, but can live more than twenty years, depending on variety and
climate. The plant grows to a height of up 3 ft, and has a deep root system,
sometimes stretching more than 49 ft. This makes it very resilient, especially
to droughts.
Alfalfa is a small seeded crop, and has a slowly-growing seedling, but after
several months of establishment, forms a tough 'crown' at the top of the root
system. This crown contains many shoot buds that enables alfalfa to re-grow many
times after being grazed or harvested.
This plant exhibits autotoxicity, which means it is difficult for alfalfa seed
to grow in existing stands of alfalfa. Therefore, it is recommended that alfalfa
fields be rotated with other species (for example, corn or wheat) before
reseeding.
Updates
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