Abstract
Outcrossing in rice mainly depends on climatic factors. Favorable environments increase hybrid seed production. Likewise, synchrony in flowering of male and female parents also increases seed set. We therefore conducted two trials to investigate these two important aspects. A trial was conducted in semiarid and humid zones of Andhra Pradesh during the 1991-92 wet season (WS) and dry season (DS), using IR62829A and IR62829B in a row ratio of 4A:2B. Sowings of A and B lines were staggered. Leaf clipping and rope pulling were adopted. The outcrossing percentage was higher at Palem and Warangal, located in the semiarid zone (>40%), than at Maruteru, located in the humid zone (<20%) in both seasons. Seed yield was also higher in the semiarid regions in the 1991 WS (Palem, 959 kg ha -1 ; Warangal, 1,191 kg ha -1 ) and 1992 DS (Palem, 1,527 kg ha -1 ) than in the humid zone Maruteru, WS 408 kg ha-1 and DS 851 kg ha -1 ).
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