Definition - What does Root nodule mean?
A root nodule, is a specific type of swelling triggered by of cellular division of healthy roots, producing root hairs that are capable of nitrogen fixation. Root nodules capture nitrogen from the air, convert it to ammonia, and then break that down into more usable forms for the plant. The nodules do this in conjunction with a specific type of bacteria, of the genus Rhizobium. The cooperative bond between the bacteria and the root is accomplished by the bacteria entering into the root nodule, once it has been completely encircled by it and has reproduced forming a micro colony within the root nodule’s formidable embrace.
MaximumYield explains Root nodule
The leguminous family of plants, which include beans, peas, peanuts, soybeans and many ground cover and cover crops, is most associated with the formation of root nodules. There are a few species of flora however that also produce root nodules capable of nitrogen fixation. Some species of trees and shrubs including members of both the rose and the Buckthorn families also form root nodules with the ability of nitrogen fixation. Root nodule bearing plants are valued for their ability to add nitrogen (a nutrient needed by most plants in high quantities) back into the soil, especially when used as seasonal or annual crops.