Exposure of sorghum (sorghum bicolor) during flowering time for a period of 10-15 days to high temperature stress (>36-38oC) reduced pollen germination, failure of fertilization and flower abortion. Several improved varieties of sorghum have recently been released for the Sudan and Sahel zones of Nigeria, with their dissemination limited by seed availability. To improve the supply of Breeder and Foundation seeds for production of certified, these varieties; SAMSORG 45 and SAMSORG 46 with two old but popular varieties SAMSORG 41 and SAMSORG 17 were grown under irrigation at Dadinkowa (10.18N, 11.27S) to assess their productivity during the dry season at two planting dates (October and January
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