TY - JOUR
T1 - Impact of tillage, stubble mananagement and crop rotation on the nematode populations in a long-term field experiment
AU - Rahman, L.
AU - Chan, K.Y.
AU - Heenan, D.P.
N1 - Imported on 12 Apr 2017 - DigiTool details were: month (773h) = September 2007; Journal title (773t) = Soil and Tillage Research. ISSNs: 0167-1987;
PY - 2007/9
Y1 - 2007/9
N2 - Paratylenchus spp.) densities were greater in plots without N-fertiliser (295'741 kg'1 soil) than the plots with N-fertiliser (14'158 kg'1 soil). Tillage practices had significant (P < 0.05) effects mostly on the population densities of plant-parasitic nematodes while stubble management had significant effects (P < 0.05) on free-living nematodes. However, interaction effects of tillage and stubble were significant (P < 0.01) for the population densities of free-living nematodes only. Population of Rhabditidae was significantly higher in conventional cultivated plots (7244 kg'1 soil) than the direct drilled (3981 kg'1 soil) plots under stubble retention. In contrast, plots with direct drill and stubble burnt had significantly higher populations of Dorylaimidae than the conventional cultivation with similar stubble management practice. No correlations between abundance of free-living nematodes, and concentration of total C and labile C in soil were observed in this study. These results showed that stubble retention contributed for enormous population density of free-living (beneficial) nematodes while conventional cultivation, irrespective of stubble management, contributed for suppressing plant-parasitic nematodes.The population abundance of free-living and plant-parasitic nematodes was investigated in a long-term rotation/tillage/stubble management experiment at Wagga Wagga Agricultural Institute, New South Wales (NSW), Australia. The treatments were a combination of two crop rotations: wheat (Triticum aestivum)'wheat and wheat'lupin (Lupinus angustifolius); two tillage systems: conventional cultivation (CC) and direct drill (DD); and two stubble management practices: stubble retention (SR) and stubble burnt (SB). Plots of one of the wheat'wheat treatments received urea at 100 kg N ha'1 during the cropping season. Soil samples from 0'5 and 5'10 cm depths were collected in September (maximum tillering), October (flowering) and December (after harvest), 2001, to analyse nematode abundance. Soil collected in September was also analysed for concentrations of total and labile C, and pH levels. hree nematode trophic groups, namely bacteria-feeders (primarily Rhabditidae), omnivores (primarily Dorylaimidae excluding plant-parasites and predators) and plant-parasites (Pratylenchus spp. and Paratylenchus spp.) were recorded in each soil sample. Of them, bacteria-feeders (53'99%, population range 933'2750 kg'1 soil) dominated in all soil samples. There was no difference in nematode abundance and community composition between the 0'5 cm and 5'10 cm layers of soil. The mean population of free-living and plant-parasitic nematodes varied significantly between the treatments in all sampling months. In most cases, total free-living nematode densities (Rhabditidae and Dorylaimidae) were significantly (P < 0.001) greater in wheat'lupin rotation than the wheat'wheat rotation irrespective of tillage and stubble management practices. In contrast, a greater population of plant-parasitic nematodes was recorded from plots with wheat'wheat than the wheat'lupin rotation. For treatments with wheat'wheat, total plant-parasitic nematode (Pratylenchus spp. and
AB - Paratylenchus spp.) densities were greater in plots without N-fertiliser (295'741 kg'1 soil) than the plots with N-fertiliser (14'158 kg'1 soil). Tillage practices had significant (P < 0.05) effects mostly on the population densities of plant-parasitic nematodes while stubble management had significant effects (P < 0.05) on free-living nematodes. However, interaction effects of tillage and stubble were significant (P < 0.01) for the population densities of free-living nematodes only. Population of Rhabditidae was significantly higher in conventional cultivated plots (7244 kg'1 soil) than the direct drilled (3981 kg'1 soil) plots under stubble retention. In contrast, plots with direct drill and stubble burnt had significantly higher populations of Dorylaimidae than the conventional cultivation with similar stubble management practice. No correlations between abundance of free-living nematodes, and concentration of total C and labile C in soil were observed in this study. These results showed that stubble retention contributed for enormous population density of free-living (beneficial) nematodes while conventional cultivation, irrespective of stubble management, contributed for suppressing plant-parasitic nematodes.The population abundance of free-living and plant-parasitic nematodes was investigated in a long-term rotation/tillage/stubble management experiment at Wagga Wagga Agricultural Institute, New South Wales (NSW), Australia. The treatments were a combination of two crop rotations: wheat (Triticum aestivum)'wheat and wheat'lupin (Lupinus angustifolius); two tillage systems: conventional cultivation (CC) and direct drill (DD); and two stubble management practices: stubble retention (SR) and stubble burnt (SB). Plots of one of the wheat'wheat treatments received urea at 100 kg N ha'1 during the cropping season. Soil samples from 0'5 and 5'10 cm depths were collected in September (maximum tillering), October (flowering) and December (after harvest), 2001, to analyse nematode abundance. Soil collected in September was also analysed for concentrations of total and labile C, and pH levels. hree nematode trophic groups, namely bacteria-feeders (primarily Rhabditidae), omnivores (primarily Dorylaimidae excluding plant-parasites and predators) and plant-parasites (Pratylenchus spp. and Paratylenchus spp.) were recorded in each soil sample. Of them, bacteria-feeders (53'99%, population range 933'2750 kg'1 soil) dominated in all soil samples. There was no difference in nematode abundance and community composition between the 0'5 cm and 5'10 cm layers of soil. The mean population of free-living and plant-parasitic nematodes varied significantly between the treatments in all sampling months. In most cases, total free-living nematode densities (Rhabditidae and Dorylaimidae) were significantly (P < 0.001) greater in wheat'lupin rotation than the wheat'wheat rotation irrespective of tillage and stubble management practices. In contrast, a greater population of plant-parasitic nematodes was recorded from plots with wheat'wheat than the wheat'lupin rotation. For treatments with wheat'wheat, total plant-parasitic nematode (Pratylenchus spp. and
KW - Open access version available
KW - Management
KW - Nematode
KW - Rotation
KW - Stubble
KW - Tillage
U2 - 10.1016/j.still.2006.11.008
DO - 10.1016/j.still.2006.11.008
M3 - Article
SN - 0167-1987
VL - 95
SP - 110
EP - 119
JO - Soil Technology
JF - Soil Technology
IS - 1-2
ER -
