The aim of the study was to describe the weed community dynamics of rice fields in different management systems. The study was carried out from 2004 to 2009 at Vercelli (N-W Italy) considering eight plots managed in different ways: autumn ploughing with straw incorporation and rice seeding in flooded field as a reference treatment (SAF), spring ploughing with straw incorporation and rice seeding in flooded field (SPF), autumn ploughing with straw incorporation and rice seeding in dry field (SAD), straw burning in autumn and rice seeding in flooded field (SBF), autumn ploughing with straw and liquid manure incorporation and rice seeding in flooded field (SMAF), rice rotation with two years of rice and one of maize (SPFR1, SPFR2, SPFR3). Weed assessments were performed in 3 untreated areas for each plot several times during the growing season. Weed seed bank was determined in 2006 and 2009, taking soil cores at 0-10 cm and 10-20 cm depth. The major weeds found in water-seeded plots were: Heterantera reniformis, Schoenoplectus mucronatus, Ammania coccinea and Lindernia dubia, while Echinochloa crus-galli was mainly present in SAD plot. Lower relative weed densities were found in SBF, SAD and SPFR3 with values ranging from 2.6% (SAD-2004) and 82% (SPFR- 2009) compared to the reference treatment SAF. The other rotational plots showed a more variable density through the years and a higher number of weed species. Weed seed bank was comprised between 1500 seeds m/2 (SAD and SBF-2009 at 0-10 cm) and 10700 seeds m/2 (SPFR3-2006 at 10-20 cm). Seed bank values were similar among the plots, with a strong effect of crop rotation.
Weed community dynamics of rice fields in different management systems
VIDOTTO, Francesco;FOGLIATTO, SILVIA;MILAN, MARCO;FERRERO, Aldo
2012-01-01
Abstract
The aim of the study was to describe the weed community dynamics of rice fields in different management systems. The study was carried out from 2004 to 2009 at Vercelli (N-W Italy) considering eight plots managed in different ways: autumn ploughing with straw incorporation and rice seeding in flooded field as a reference treatment (SAF), spring ploughing with straw incorporation and rice seeding in flooded field (SPF), autumn ploughing with straw incorporation and rice seeding in dry field (SAD), straw burning in autumn and rice seeding in flooded field (SBF), autumn ploughing with straw and liquid manure incorporation and rice seeding in flooded field (SMAF), rice rotation with two years of rice and one of maize (SPFR1, SPFR2, SPFR3). Weed assessments were performed in 3 untreated areas for each plot several times during the growing season. Weed seed bank was determined in 2006 and 2009, taking soil cores at 0-10 cm and 10-20 cm depth. The major weeds found in water-seeded plots were: Heterantera reniformis, Schoenoplectus mucronatus, Ammania coccinea and Lindernia dubia, while Echinochloa crus-galli was mainly present in SAD plot. Lower relative weed densities were found in SBF, SAD and SPFR3 with values ranging from 2.6% (SAD-2004) and 82% (SPFR- 2009) compared to the reference treatment SAF. The other rotational plots showed a more variable density through the years and a higher number of weed species. Weed seed bank was comprised between 1500 seeds m/2 (SAD and SBF-2009 at 0-10 cm) and 10700 seeds m/2 (SPFR3-2006 at 10-20 cm). Seed bank values were similar among the plots, with a strong effect of crop rotation.
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
