Author(s): A.L. RANAWAKE, U.T.D. RODRIGO AND S.G.J.N. SENANAYAKE

Abstract: Salinity is a major factor reducing plant growth and productivity in rice cultivation. The effect of selected Agro-chemicals named Imidacloprid 70% WS (Gaucho), Thiamethoxam 70% WS (Cruiser), Nitrophenolate 0.5% WS (Atonik) on salinity tolerance at the seedling stage of 8 rice varieties (Bg 250, Bg 305, At 302, Bg 352, Bg 357, Bg 358, Bg 360, Bg 379/2) were studied. Recommended dosage of each chemical was used for seed treatment in each case. Control seeds were germinated without any seed treatment. Germinated seedlings were planted in sterilized sand medium supplemented with nutrient solution. Experiment was carried out following randomized complete block design with 4 replication and 50 plants were included in each replication. After 12 days, plants were treated with 5 dS/m salinized solution and let them grow in the salinized medium for 8 days. Another set of plants treated with Agrochemicals were maintained without giving salinity stress. After 8 day salinity stress different seedling parameters were recorded. All the Agrochemicals significantly reduced the adverse affects of salinity stress in rice seedlings. Varieties Bg 250, Bg 352 and Bg 379/2 recorded most positive effects of the chemicals.

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