Phytosociological Analysis of Weeds in Crop Fields under ‘Jhum’ and Terrace Cultivation

Twelve crop fields occupied by six major crops at two altitudes in Meghalaya were surveyed extensively for phytosociological analysis during the period 1988–90. The low altitude had greater (7–15) representation of perennials than the high altitude (1–2) while at higher altitude, annuals were more common. Among 12 fields, groundnut and radish fields had highest species richness (39 species each). The crop fields located at high altitude had always lower number of species than those at low altitude.