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Hard or impermeable seed coat is a mechanism that insures the survival of Senna obtusifolia. Senna obtusifolia is traditionally and economically important plant. Information on ways to break seed dormancy would be useful for uniform germination and post emergence management of the plant. In July 2016, a green house trial was conducted at Department of Agricultural Education, Federal College of Education (Technical) Bichi to determine the effects of hot water ((100 0C ) at different length of time that would break the seed dormancy of Senna obtusifolia. Dip Senna obtusifolia seeds in hot water ((100 0C ) for 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19 and 20 minutes and dip seeds in ordinary water for 12 hours were studied for fourteen days, and direct sowing (untreated) served as control. The experimental design used was completely randomized with three replications, Parameters considered include days to germination and percentages of germinated seeds per treatment. Breaking dormancy/germination frequencies for the same treatment were grouped and expressed as percentage. Results per treatment were analyzed through analysis of variance (ANOVA). All the hot water treatments (except dip for one minute) and dip for 12 hours in ordinary/normal water initiated their germination (100%) three days after sowing. Dip for one minute and direct (untreated) seeds initiated 30% germination four days after sowing. Thus hot water dips at 100 0C for length of time from 2 to 20 minutes and dip for 12 hours in ordinary water are recommended for breaking seed dormancy of Senna obtusifolia from Bichi, Nigeria.

Effects of Hot Water on Breaking Seed Dormancy of Senna obtusifolia from Bichi, Nigeria, in Green House Conditions.