Author : Surjit Singh

Summary : Pot and field experiments were conducted to study the effects of lime and phosphate treatments on growth and nutrient uptake of four rice varieties on an acid sulfate soil from Malinao, Albay. The pot experiment was conducted in the screenhouse at UP Los Baños in the 1984 dry season. Treatments included 0 and 2 t lime/ha and 0, 200 and 400 kg P2O5/ha in factorial combination; two low lime rates; Maahas clay soil and four varieties, namely, IR 26, IR 45, IR 46, and IR 4683-54-2. Nutrient element determinations were made six weeks after transplanting and at harvest. The field experiment was conducted at Malinao, Albay during the 1984 wet season using the same varieties, lime, and phosphate rates in factorial combination as those in the pot experiment. Liming the acid sulfate soil did not prove beneficial in both pot and field experiments and adversely affected the yield components and grain yield of all varieties studied.