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Titolo:
DENITRIFICATION LOSSES OF NITROGEN-FERTILIZER APPLIED TO WINTER-WHEATFOLLOWING LEY AND ARABLE ROTATIONS AS ESTIMATED BY ACETYLENE INHIBITION AND N-15 BALANCE
Autore:
GOULDING KWT; WEBSTER CP; POWLSON DS; POULTON PR;
Indirizzi:
AFRC,INST ARABLE CROPS RES,DEPT SOIL SCI,ROTHAMSTED EXPTL STN HARPENDEN AL5 2JQ HERTS ENGLAND
Titolo Testata:
Journal of soil science
fascicolo: 1, volume: 44, anno: 1993,
pagine: 63 - 72
SICI:
0022-4588(1993)44:1<63:DLONAT>2.0.ZU;2-Q
Fonte:
ISI
Lingua:
ENG
Soggetto:
OXIDE REDUCTION; AMMONIUM-NITRATE; GRASSLAND SOIL; FIELD; NITRIFICATION; ATMOSPHERE; INPUTS; PLANTS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
31
Recensione:
Indirizzi per estratti:
Citazione:
K.W.T. Goulding et al., "DENITRIFICATION LOSSES OF NITROGEN-FERTILIZER APPLIED TO WINTER-WHEATFOLLOWING LEY AND ARABLE ROTATIONS AS ESTIMATED BY ACETYLENE INHIBITION AND N-15 BALANCE", Journal of soil science, 44(1), 1993, pp. 63-72

Abstract

We studied the fate of 222 kg N ha-1 applied in spring as (KNO3)-N-15to winter wheat test crops which followed either continuous arable cropping (Arable) or a rotation in which a 3-year grass/clover ley preceded the wheat (Ley). Denitrification losses (measured by an acetylene-inhibition method) of over 1 kg N ha-1 d-1 were measured for short periods following heavy rain in mid-May. However the generally dry and cool weather resulted in accumulated losses by denitrification between fertilizer application and anthesis equivalent to only 5.3% and 3.6% (+/-2%) of the applied N for the arable and ley treatments respectively. The smaller loss from the lev was despite this treatment containing more inorganic N and available carbon. N-15 balance indicated that, at anthesis, 1.5% and 11.5% (+/-7%) of the labelled N was lost from the arable and ley treatments respectively. Given the precision of the N-15and the acetylene-inhibition methods, the results are not significantly different. However, the larger difference between methods for losses from the ley treatment may be an underestimate because N-15 balance does not measure losses of unlabelled N. These were probably very small on the arable treatment but could have increased total N loss by 25%to c. 32 kg ha-1 on the ley treatment compared with the 8 kg ha-1 measured as denitrificd. Such a large difference is unlikely to be an error but was probably due to ammonia volatilization from this crop whichwas severely infected by mildew. The results were thus a poor test ofthe acetylene-inhibition method, but revealed another loss process which could be significant in some situations.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 22/09/20 alle ore 14:05:03