Abstract: Technical lignins derived from Kraft have been subjected to ammoxidation aiming at producing slow-release nitrogenous fertilizers. Most of these studies were investigated because the stable organic matrix of lignins is well suited for humus formation. In this paper,pot tests,with A. bettzickiana (Regel) Nichols utilizing ammoxidized lignin and urea as N-fertilizers for comparison, were carried in greenhouse of Nanjing Forestry University. The pot contained 1. 0 kg of screened soil. Seven different treatments were conducted,two at the low dosage(N 0. 1 g/kg),two at the standard dosage (N 0. 2 g/4g),one combination of atmmoxidized lignin and urea(N 0. 2 g/kg),and two at a twice standard dosage(N 0. 4 g/kg). Phosphorous and potassium were incorporated in the soil. Results showed, A. bettzickiana Nichols biomass without any fertilizer was the lowest (the yield was 2. 180 g/pot) in all treatments. The application of 1. 818g ammoxidized lignin per pot(corresponding to N 0. 2 g/kg) resulted in a biomass of 4. 066 g/pot. This was 83. 3%of the biomass obtained by urea at the same dosage. The mixture of ammoxidized lignin and urea showed similar biomass as ammokidized lignin alone. The amount of ammoxidized lignin was increased by a facter of 2, the biomass rose only by 2. 68%. Toxic effects on the plant were not observed. The question whether ammoxidized lignin for fertilizering can be put into practice should not be completely answered. Further pot trials and field experiments are needed. The mid-term and long-term fertilizering effects and humus-forming capacity have to be observed.