If rhizobia are present, root nodulation begins by the time the third node appears.
Nodulation typically continues for 8 weeks before the symbiotic infection process stabilizes.
Soybean seeds come in a wide variety sizes and hull colors such black, brown, yellow, and green.
The hull of the mature bean is hard, water-resistant, and protects the cotyledon and hypocotyl (or "germ") from damage.
is a species of legume native to East Asia, widely grown for its edible bean which has numerous uses.
Fat-free (defatted) soybean meal is a significant and cheap source of protein for animal feeds and many packaged meals.
The Protein Digestibility Corrected Amino Acid Score (PDCAAS) of soy protein is the nutritional equivalent of meat, eggs, and casein for human growth and health.
In 100 grams, raw soybeans supply 446 calories and are 9% water, 30% carbohydrates, 20% total fat and 36% protein (table).
Soybeans are an exceptional source of essential nutrients, providing in a 100 gram serving (raw, for reference) high contents of the Daily Value (DV) especially for protein (36% DV), dietary fiber (37%), iron (121%), manganese (120%), phosphorus (101%) and several B vitamins, including folate (94%) (table).
The remainder consists of 30% carbohydrates, 9% water and 5% ash (table).
Soybeans comprise approximately 8% seed coat or hull, 90% cotyledons and 2% hypocotyl axis or germ.
If the seed coat is cracked, the seed will not germinate.