Soil amendment with crustacean chitin used alone or with <em>Pseudomonas aeruginosa Bacillus subtilis</em> significantly (p<0,05) reduced infection of <em>Rhizoctonia solani Fusarium solani</em> on sunflower and <em>R.solani</em> on chickpea. Crab chitin used alone or with <em>P.aeruginosa</em> or <em>B.subtilis</em> completely controlled the infection of <em>Macrophomina phaseolina</em> on chickpea. Prawn or shrimp powder used 1% w/w of soil was found phytotoxic on chickpea but not on sunflower. Maximum fresh weight of shoot was produced by <em>P.aeruginosa</em> used with shrimp powder in sunflower and with crab chitin in chickpea. <em>P.aeruginosa</em> produced greater plant height in chickpea used with shrimp chitin.