Abstract

                                A field experiment was conducted at National Agricultural Research Project, Tirupati, during Kharif, 1981 to study the variation in the physiological parameters of popular ground- nut varietles belonging to different habitat groups, under adequate water availability. Crop canopy expansion as reflected in LAI was maximum at 90 DAS (Virginia runner) and 75 DAS (Valencia, Spanish and Virginia bunch). The leaf senescence started from 75 DAS onwards in all the groups except in virginia runner in which it was observed from 90 DAS onwards. CGR and NAR were maximum between 46 to 60 DAS in Valencia, Spanish and Virginia bunch while two peaks were observed in CGR (31-75 & 61-75 DAS) in the spreading type, Leaf and stam contribution towards total dry matter production was equal upto 60 DAS in all the groups and from 60th day stem contribution was more. The reproductive effeciency end translocation efficiency were higher in valincia and spanish bunch groups compared to the spreading and semi-spreading groups.

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