Phytosociological studies on weeds of groundnut in Chittoor district, Andhra Pradesh.
Thirty-four of the 43 weeds found under non-irrigated fields were broadleaved weed, predominantly C3 types, Borreria hispida, Acanthospermum hispidum, Celosia viridis, Leucas lavadulaefolia and Allmania longipendunculata. C4 and C3 types were almost equally dominant among the grasses which included Cyperus rotundus and Cynodon dactylon (C4 type) and Bulbostylis barbata and Commelina encifolia (C3 type). Dominant broadleaved weeds of the irrigated crop were Digera muricata, Acalypha indica, Cleome viscosa, and Croton bonplandianum and among the grasses were Brachiaria reptans, C. rotundus, Urochloa setigera, Commelina benghalensis and C. dactylon. The study revealed that broadleaved weeds dominated under both conditions and competed with the crop.