Abstract

                                Six pigeonpea cultivars were grown under three different dates of sowing (21-2-84, 21-6-84 and 21-9-84) to examine the effects of environmental influence on phenology and transpiration rate. Transpiration rate was measured at selective stages of crop growth. Phenological observation were also recorded. Dry matter accu- mulation (DMA) and seed yield were recorded at harvest stage. Days to first flower opening. 50% flowering and harvest were reduced pro- gressively from February to September planting. Earlier flowering with shorter crop duration was observed in September sowings. Transpiration rate increased upto 50% flowering and thereafter declined. It was more in February sown crops as compared to others. It had positive and significant association with DMA and seed yield in all the stages of crop growth with the highest correlation at 50% flowering stage.

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