Effect of Long Term Fertilizer Application on Potassium Balance, Yield Decline and Plant Parasitic Nematodes in Jute Under Jute-Rice-Wheat Rotation

After 26 years of cropping, the plant parasitic nematodes were estimated from on AICP on long term fertilizer study carried out in a fixed laid out with jute-rice-wheat rotation. Estimation of nematode in jute during 26^th annual cropping cycles was compared with Iyh cycles showed an increase of root-knot nematode where as other nematode increase/decrease with varying propOliion/population. Significant removal of soil potassium due to cropping influenced the nematode population viz., Meloidogyne incognita. Intensive and continuous application of imbalance inorganic fertilizer resulted a decline in crop yield and potassium balance associated with build up of plant parasitic nematodes.