A field experiment was conducted during the spring season of 1995 and 1996 at Baruipur, to study the effect of micronutrients on physiological parameters in relation to yield of greengram (Phaseolus radiatus L.) on rice fallow Gangetic alluvial land (Entisol). Application of muiti-micronutrients followed by Zn alone resulted in better physiological parameters like dry-matter production (DM), leaf-area index (LAI), crop-growth rate (CGR), net assimilation rate (NAR) and yield components leading to higher grain yield compared with sole application of Mn, Cu, B, Mo and Fe. Multi-micronutrients and Zn resulted in 39 and 34% higher yield respectively over no micronutrient. There was a positive relation between DM, LAI, CGR and yield, and an inverse relationship between NAR and yield. The yield was not at all impaired despite inverse relation between NAR and yield, probably because of a good balance between photosynthesis and respiration.