The present investigation was conducted to study the effect of biopesticide neem and its interactive effects with iron and zinc on growth and metabolic activity of moong plants (Phaseolus radiatus). Six doses were supplied in the concentration of 0.5% neem, 1% neem, 2% neem, 5% neem, 2% neem + 5.6ppm Fe and 2% neem+15ppm Zn. Root length, shoot length and percentage germination of moong plants were found to be increased under the effect of neem treatments. Both the micronutrients further enhanced root and shoot growth when supplied with 2% neem. Upto 18% and 35% increase in root growth and upto 73% and 92% increase in shoot growth was observed at combined dose of 2% neem+5.6ppm Fe and 2% neem+15ppm Zn respectively whereas increase of only upto 12% and 63% was observed at 2% neem dose with respect to that in control in these parameters. 5% neem treatment was however found to be toxic to some extent as it decreased the plant growth. Chlorophyll content and protein content of moong plants were also increased with increasing doses of neem except at 5% dose of neem. An increase of 22.93% was observed in chlorophyll content at 2% neem+5.6ppm Fe whereas upto 95% increase in protein content was observed at 2% neem+15ppm Zn dose. Catalase activity increased whereas peroxidase activity decreased with increasing doses of neem except at 5% dose. Both 5.6ppm Fe and 15ppm Zn, when supplied separately with 2% neem showed additional increasing effect in catalse activity.
