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Effetti dell'intensità di utilizzazione sulla produzione foraggera e sull'azotofissazione della sulla

Eusebi, Lucia and Seddaiu, Giovanna and Roggero, Pier Paolo (2003) Effetti dell'intensità di utilizzazione sulla produzione foraggera e sull'azotofissazione della sulla. Rivista di agronomia, Vol. 37 (1), p. 145-152. ISSN 0035-6034. Article.

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Objectives of this research were (I) to quantify nitrogen fixation under field conditions of sweetvetch in relation to the cutting intensity; (II) to evaluate the effect of the control species on the reliability of the estimate of nitrogen fixation, using the nitrogen balance method (NB); (III) to verify the possibility of application of the natural abundance method (NA) in the environmental conditions of the experimental site.
Two cutting intensities were compared: intensive (2 early cuts in spring and 1 autumn cut) and extensive (1 cut in spring + possible cleaning cut in summer). Three control species were tested: Lolium hybridum, Cicorium inthybus and Phalaris aquatica.
The intensive cutting regime showed higher levels of nitrogen fixation in the above ground phytomass compared to those achievabie through extensive utilization (about 300 vs. 235 kg N ha-1).
The nitrogen fixation assessed by the NB method was underestimated when Phalaris aquatica was used as control species, while nitrogen fixation was not affected by the control species using the NA method.
The results show that soil δ 15N in the experimental site was sufficient for the application of NA method. The δ 15N of sulla cultivated in a soil without combined nitrogen was obtained indirect1y (B = -2,4) by assuming that the percentage of nitrogen fixation on total nitrogen of sulla is never higher than 95%. Further investigations are required to verify this parameter and to evaluate the fate of fixed nitrogen in the following crop after a legume crop. The dynamics of the morphological stage of deveIopment, of the leaf to stem ratio and of the total nitrogen of the aboveground phytomass influenced the reliability of the control species using the NB method.

Item Type:Article
ID Code:1314
Uncontrolled Keywords:Cicorium inthybus, field assessment, Hedysarum coronarium L., Lolium hybridum, natural abundance, nitrogen balance, nitrogen fixation, Phalaris acquatica
Subjects:Area 07 - Scienze agrarie e veterinarie > AGR/02 Agronomia e coltivazioni erbacee
Divisions:001 Università di Sassari > 01 Dipartimenti > Scienze agronomiche e genetica vegetale agraria
Publisher:Forum editrice udinese
Copyright Holders:© 2003 Forum Editrice Universitaria Udinese
Publisher Policy:Depositato per gentile concessione dell'Editore e della Società italiana di agronomia
Deposited On:21 Apr 2010 14:12

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