Effect of Increasing Rates of Sunflower Residues on the Evolution of Soil Mineral N In A Laboratory Incubation Study

An aerobic soil incubation test was carried out in the laboratory to study the N immobilizationmineralization process when increasing rates of sunflower residues were incorporated into the soil at 0, 0.15, 0.5 and 1g of residues per 50g of soil. The soil obtained from a plot where sunflower has been cultivated was incubated at 32°C for 3 months. For all residues rates, nitrogen was rapidly immobilized in the first four days of incubation, then it was rapidly liberated into the soil. However, the amount of nitrogen remineralized decreased with increasing rate of residues incorporated. In terms of incubation period, the rate of N immobilized by residues relative to the control was 22, 18, 47 and 70% for R1, R2, R3 and R4, respectively.

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