RRL

RRL  Nitrogen makes up 78 percent of the earth's atmosphere and is essential to healthy plant growth. Without it, green plants are weak and smaller than they should be. Too much nitrogen, on the other hand, makes plants unable to withstand frosts or heavy winds. The nitrogen cycle transforms organic matter and animal manure into usable nitrogen. The entire cycle happens in the soil. Earthworms, bacteria and decay break down the proteins in the organic matter, assisting it to decompose.

 Legumes have rhizobium bacteria in their root nodules. These bacteria are able to take nitrogen directly from the atmosphere and fix it into the soil. An acre of alfalfa, for example, is able to fix 251 pounds of nitrogen from the atmosphere into the soil. Some soluble nitrates also enter the soil after atmospheric nitrogen reacts with rain water. Legume plants are also notable for their ability to fix atmospheric nitrogen; this is due to the mutuality symbiotic relationship with bacteria found in root nodules of these plants. The ability to form this mutualism reduces fertilizer costs for farmers and gardeners who grow legumes, and allows legumes to be used in a crop rotation to replenish soil that has been depleted of nitrogen. The nitrogen fixation ability of legumes is enhanced by the availability of calcium in the soil and reduced by the presence of ample nitrogen. Legume seed and foliage have comparatively higher protein content than non-legume material, probably due to the additional nitrogen that legumes receive through nitrogen-fixation symbiosis. The high protein content makes them desirable crops in agriculture.

 According to the evidences that accumulated, we have the chances to accomplish well our study. Since Nitrogen helps to fertile the soil well when the root nodules in the soil is present in the soil, the nitrogen can directly fix into the soil.