Precursor (L-tryptophan)-Inoculum (Azotobacter) Interaction for Improving Yields and Nitrogen Uptake of Maize.Published in:Journal of Plant Nutrition, 2005, v. 28, n. 5, p. 805, doi. 10.1081/PLN-200055543By:Zahir, ZahirAhmad;Asghar, HafizNaeem;Akhtar, MuhammadJaved;Arshad, MuhammadPublication type:Article