After an extensive survey of the Kumaun region in the Central Himalaya, 28 different landraces of upland rice were collected. These landraces were studied for variation in chlorophyll content and photosynthetic rate and were compared with an introduced high-yielding variety (VL 206) released by the Vivekananda Hill Agriculture Research Laboratory, Almora (Indian Council of Agricultural Research), for rainfed areas.
Landraces were grown in earthen pots (30 cm diameter and 30 cm high) containing farmyard manure, sand, and soil (1:1:1, v/v) during kharif (wet season) in 1998. Three sets of plants (15 plants per set) per landrace were kept under similar environmental conditions in the Institute nursery at Kosi (1,150 m asl; geographical coordinates 79° 38¢ 10¢¢ E and 29° 38¢ 15¢¢ N). Pots were irrigated to maintain soil moisture (around 23Ð25%) for seed germination. No watering was done after germination and plants were kept under rainfed conditions.