Influence of Carbonaceous and Nitrogenous Amendments on Population Dynamics of Tylenchus and Criconemoides in Soil

Amendment of soil with the lowest dosage of chitin, 0.1 per cent (W/W) caused significant suppression of Tylenchus spp. and Criconemoides spp, 7 and 21 days after amendment compared to population in non-amended soil. Cellulose at 1.0 per cent (W/W) dosage recorded higher reduction of both the nematode spp. than 0.1 per cent dosage 7 and 21 days after amendment. Starch at 0.1 per cent dosage yielded significant decrease in the counts of Tylenchus and Criconemoides 7 days after amendment. Starch at 0.5 per cent also caused significant suppression after 21 days and 1.0 per cent dosage 7, 21 and 35 days after amendment. Dextrose at 0.1 per cent dosage caused significant drop in the counts of Criconemoides at the end of 7 and 21 days, whereas 1.0 per cent dextrose caused significantly higher reduction of both the nematodes than 0.1 per cent 7, 21 and 35 days after amendment. Amendment of soil with urea, 120 and 240 Kg N/ha. caused significant decrease in the numbers of both the nematodes at all the three time intervals.