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Titolo:
Lucerne in crop rotations on the Riverine Plains 2. Biomass and grain yields, water use efficiency, soil nitrogen, and profitability
Autore:
Hirth, JR; Haines, PJ; Ridley, AM; Wilson, KF;
Indirizzi:
Agr Victoria Rutherglen, Dept Nat Resources & Environm, Rutherglen, Vic 3685, Australia Agr Victoria Rutherglen Rutherglen Vic Australia 3685 Vic 3685, Australia
Titolo Testata:
AUSTRALIAN JOURNAL OF AGRICULTURAL RESEARCH
fascicolo: 2, volume: 52, anno: 2001,
pagine: 279 - 293
SICI:
0004-9409(2001)52:2<279:LICROT>2.0.ZU;2-B
Fonte:
ISI
Lingua:
ENG
Soggetto:
MEDITERRANEAN-TYPE ENVIRONMENT; SUBSEQUENT WHEAT; PROTEIN;
Keywords:
dryland salinity; phase farming;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
42
Recensione:
Indirizzi per estratti:
Indirizzo: Hirth, JR Agr Victoria Rutherglen, Dept Nat Resources & Environm, RMB 1145, Rutherglen, Vic 3685, Australia Agr Victoria Rutherglen RMB 1145 Rutherglen Vic Australia 3685 a
Citazione:
J.R. Hirth et al., "Lucerne in crop rotations on the Riverine Plains 2. Biomass and grain yields, water use efficiency, soil nitrogen, and profitability", AUST J AGR, 52(2), 2001, pp. 279-293

Abstract

In a field experiment in north-eastern Victoria (average annual rainfall 598 mm), the impact of 2-4 years of lucerne growth on the following 3-4 crops was assessed. Controls of continuous lucerne, annual pasture, and continuous crop were compared with 5 lucerne-crop rotations. Above-ground biomass and water use efficiency of lucerne, annual pasture, and crops were assessed, as were the soil N status, grain yields, and profitability of crops after lucerne. Lucerne grew more slowly over the autumn-spring growing season (20 kg DM/ha.day) than did annual pastures and crops (41 and 58 kg DM/ha.day, respectively), while over the spring-autumn period, it grew at a mean 26 kg DM/ha.day. The summer growth rates of lucerne were, however, highly variable (1-52 kg DM/ha.day). Despite large changes in temperature and water availability over the year, the biomass water use efficiency (WUEB) of lucerne was similar over the winter and summer growth seasons (16 and 10 kg DM/ha. mm, respectively) and averaged 13 kg DM/ha.mm for the whole year. In contrast, the WUEB of wheat, canola, and annual pasture over their respective growth seasons averaged 36, 38, and 26 kg DM/ha.mm. When calculated over a whole year, however, they were much closer to lucerne at 23, 14, and 17 kg DM/ha.mm, respectively. Autumn removal of lucerne left soils initially low in mineral N (mean 82 kg N/ha.m depth in April) for the establishment of the first crop, but this was not reflected in the subsequent N contents of crop biomass and grain. Autumn mineral N concentrations peaked 1-2 years after lucerne removal (mean141 kg N/ha.m depth). Yields of first crops after lucerne were strongly dependent on growing season rainfall. When sowing commenced in a wet year, they were similar to, or greater than, the control, but when sown in a dry year, were substantially lower. When sowing commenced in a wet year, lucerne supplied additional N for a minimum of 2 crops. At least 3 crops were supplied with lucerne N when cropping commenced in a dry year. The inclusion of 2-3 years of lucerne into a continuous cropping sequence only decreased annual profitability by $AU40/ha. This work shows that short phases of lucerne(minimum of 3 years) followed by 3-4 crops can provide economically viableoptions for farmers and produce better hydrological outcomes than current annual-plant based cropping systems.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 30/11/20 alle ore 20:06:28