Anthracene influence on (15NH4)2SO4 fertilization of wheat seedlings |
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| Authors: | S Cervelli F Di Giovanni C Perna |
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| Institution: | 1. Institute of Soil Chemistry, C.N.R., Via Corridoni 78, 56125, Pisa, Italy
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| Abstract: | The influence of the addition of anthracene (1 μg anthracene g?1 soil) in N transformations following (15NH4)2SO4 fertilization (200 mg N g?1 soil) was investigated in wheat pots by quadrapole mass-spectrometry. The dry matter yield at harvesting (after 16 days) was not statistically affected (P=0.05) by anthracene addition. The total amount of N from the fertilizer taken up by wheat seedings in 16 days was 29 and 26.8% of the added N in the absence and in the presence of anthracene, respectively, but the difference was not significantly different at level P=0.05. In order to investigate more deeply the effect of anthracene on the N cycle in the soil-plant system, the first-order rate constants of N mineralization, N immobilization, nitrification and N plant uptake have been determined according to a 15N + 14N soil-plant model. The comparison of the constants showed that organic N mineralization, nitrification and plant uptake proceeded at the same rate, while a small different rate (P=0.05) was shown by N immobilization. In fact, the N immobilization constant increased from 0.14±0.012 to 0.21±0.014 day?1 as a consequence of anthracene addition. |
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