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Titolo:
N-15 TRACERS COMBINED WITH TENSIO-NEUTRONIC METHOD TO ESTIMATE THE NITROGEN-BALANCE OF IRRIGATED MAIZE
Autore:
NORMAND B; RECOUS S; VACHAUD G; KENGNI L; GARINO B;
Indirizzi:
INPG,UJF,CNRS,UMR 5564,LAB ETUD TRANSFERTS HYDROL & ENVIRONM,BP 53 X F-38041 GRENOBLE FRANCE INPG,UJF,CNRS,UMR 5564,LAB ETUD TRANSFERTS HYDROL & ENVIRONM F-38041 GRENOBLE FRANCE INRA,UNITE AGR F-02007 LAON FRANCE UNIV DSCHANG DSCHANG CAMEROON LYCEE AGR F-38260 LA COTE ST ANDRE FRANCE
Titolo Testata:
Soil Science Society of America journal
fascicolo: 5, volume: 61, anno: 1997,
pagine: 1508 - 1518
SICI:
0361-5995(1997)61:5<1508:NTCWTM>2.0.ZU;2-U
Fonte:
ISI
Lingua:
ENG
Soggetto:
LABELED N-15 UREA; WINTER-WHEAT CROP; FERTILIZER; SOIL; NITRATE; WATER; FATE; AMMONIUM; CORN; NITRIFICATION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
36
Recensione:
Indirizzi per estratti:
Citazione:
B. Normand et al., "N-15 TRACERS COMBINED WITH TENSIO-NEUTRONIC METHOD TO ESTIMATE THE NITROGEN-BALANCE OF IRRIGATED MAIZE", Soil Science Society of America journal, 61(5), 1997, pp. 1508-1518

Abstract

In response to a very high increase of groundwater NO3- pollution, largely connected with intensive agricultural practices, a long-term experimentation has been set up close to Grenoble, France, with the following aims: first io characterize the response of maize (Zea mays L.), a predominant crop in the area, to fertilization, and second to quantify the N balance during and after the crop cycle. This study relates to results concerning the second issue: experiments were conducted on irrigated maize in 1991, 1992, and 1993 on the Experimental Farm at La Cote Saint-Andre, France, in the heart of one of the most important agricultural zones between the French Alps and the Rhone Valley. The dynamics of soil and fertilizer N (NO3- transport and N balance during cropping acid intercropping periods) were eoafinuousiv monitored using N-15 isotopic tracing and the tensio-neutronic method (i.e., continual measurement of soil water balance using a neutron moisture meter and tensiometers), together with porous suction cups installed at 0.3-, 0.5-, and 0.8-m depths. Water drainage and leaching of NO3--N, with a partition between that derived from fertilizer and that produced by soil mineralization, were thus obtained during and after the crop cycle. The balance of the labeled fertilizer at harvest was also determined by conventional soil coring and plant sampling. The two methods were usedsuccessfully during the 3 yr in which there were different climatic conditions and different fertilizer application rates. The results showthat the traditional fertilizer input in tile area (260 kg N ha(-1)) could be reduced nearly 30% without any substantial loss in grain yield but with a considerable reduction of nonpoint source pollution due to NO3- leaching, It is also shown that with the combined use of the two methods, it is possible to characterize separately fertilizer-N uptake, fertilizer-N leaching, and N immobilization and to estimate N-gaseous losses.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 27/11/20 alle ore 12:59:56