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POPULATION DENSITY OF PLANT-PARASITIC NEMATODES UNDER CONSERVATION AGRICULTURE AND CONVENTIONAL CROPPING SYSTEMS
Abstract
The effects of tillage methods and crop residue management practices based on conservation and conventional agriculture systems were studied on the population density of plant parasitic nematodes in two different crop rotation systems. The experimental design was a split-plot arrangement in a randomized complete block with three replications. Three tillage systems (conventional tillage, minimum tillage and no-tillage) were assigned to main plots and three level of residue management (0, 30, and 60%) were assigned to sub plots. The first rotation system include wheat, maize, wheat, melon and wheat and the second rotation system include wheat, canola, wheat, Persian clover, tomato and wheat. The results of variance analysis on the population densities of plant parasitic nematodes showed that in the first rotation system, the effect of tillage on the population of Filenchus spp. was statistically significant but the effects of tillage, residue retention and the interaction between tillage × residue retention on the population of other plant parasitic nematodes and the total number of plant parasitic nematodes were not statistically significant. In the second rotation system, tillage had a significant effect on the population density of root lesion nematode (Pratylenchus thornei), Filenchus spp. and Geocenamus spp. Furthermore the effect of residue retention on the population of Geocenamus spp. and interaction between tillage × residue retention on the population of root lesion nematode (Pratylenchus neglectus) and Geocenamus spp. was significant but the effect of tillage, residue retention and the interaction between tillage × residue retention on the population of other plant parasitic nematodes and the total number of plant parasitic nematodes was not significant. The present study indicated that the conservation agriculture practices have no significant influence on the population density of major plant parasitic nematodes under the two crop rotation sequences and do not increase the risk of damage by nematodes.
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DOI: https://doi.org/10.33866/phytopathol.030.02.0574
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