Application of organic manures and biofertilizers such as cattle manure and nitrogen fixing bacteria has lead to a decrease in the use of chemical fertilizers and has provided high quality products free of harmful agrochemicals for human safety. Cattle manure is the source of N and other nutrients for plants (such as phosphorus, potassium, calcium, iron, zinc and copper) that can make valuable contributions to soil's organic matter, can improve physical fertility, and is a center for biological activities. Free-living nitrogen fixing bacteria such as; Azotobacter chroococcum and Azospirillum lipoferum, were found to have not only the ability to fix nitrogen but also the ability to release phytohormones similar to gibberellic acid and indole acetic acid.
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