An experiment was conducted to determine the impact of mineral fertilizer (NPK) individually and/ or in combination on potato(Solanum tuberosum cv. Nicola) on root- knot nematode, Meloidogyne incognitaunder greenhouse conditions in Egypt. The treatment (combination of ammonium sulphate (20.5% N), super phosphate (15% P2O5) and potassium sulphate (48% K2O)) showed the highest efficacy in reducing the final population of root-knot population.  On the other hand; the treatment of potassium sulphate (K) showed the least effect. 

In addition, all the tested treatments increased the fresh length,of roots and shoots also, weight of potato tubers.

The combination treatment of ammonium sulphate (N), super phosphate (P) and potassium sulphate (K)) induced a remarkable reduction in the nematode population and improved both plant growth and tuber weight of potato plants.