Nodulation plays a vital role in pro-duction of leguminous crops. Besides inoculation, phosphorus has its own say on nodulation which inturn reflects on grain yield. Both extremities in soil moisture has unfavourable effect on nodulation and peak nodulation was observed under optimum soil moisture. status (Verma and Rao, 1975 and Sprent and Gallacher, 1976) Sahu (1973) recordod increased number of nodules at higher levels of phosphorus. To provide congenial moisture regime for peak nodulation, various irrigation regimes were tried along with phos-phorus fertilization for groundnut in this study.
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