Seeds of three species of Brassica, i.e., B, japonica, B. cernua, and B. napus, were stored under different humidity conditions after harvest. In each species there exists optimum hurnidity for the removal of seed dormancy. The optimum humidity lies within the range of RH 40-70% for B japonica RH 30-40% for B cernua and BH 5-40% for B. napuS. If seeds are store.d under drier or wc.tter conditions than the optimum one, the removal of dormancy is prevented semi-permanently. In the case of B, cernua and B. napus, the removal of seed dormancy is much delayed if the secds are preserved in fruits after harvest. Further, in B, cernua complete dormancy can be secondarily induced by the drying of seeds which are partially dormant
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