[Effect of boron and sowing time in causing sterility in four genotypes of wheat in the Western Hills of Nepal]
1995
Subedi, K.D. | Budhathoki, C.B. | Subedi, M. | GC, Y.D. (Lumle Agricultural Centre, Pokhara, Kaski (Nepal))
This study determined the effect of sowing time and boron application on sterility in four different genotypes of wheat (Triticum aestivum L.). Four genotypes of wheat (SW-41, BL-1022, Fang-60 and BL-1249) were planted on 21 November, 6 December and 21 December, 1994 with or without boron application at 1 kg B ha (i.e. 9 kg Borax ha) at Rishing Patan (420 m). Effect of sowing time was significant for the phenology, yield components, sterility and grain yield. Sterility was significantly increased in the 21 December planted crop, which had the lowest grain yield. There was significant genotypic difference for all the phenological parameters measured, yield components, grain yield and sterility. SW-41 and BL-1022 had significantly higher sterility than the other genotypes. In contrast Fang-60 had the lowest grain yield as a result of its lowest test weight. BL-1249 has consistently lower sterility over all sowing times and boron levels. Added boron had a significant effect on number of grains per spike, sterility, 1000 seed weight and boron content in the flag leaf at anthesis but not on the grain yield. However, there were significant interactions between boron and genotypes for the number of grains per spike and sterility, because varieties susceptible to boron deficiency (SW-41 and BL-1022) showed response to added boron for sterility but BL-1249 and Fang-60 were not affected in boron application. Boron content in the flag leaf at the time of anthesis was increased with the added boron in the soil but there was no significant genotypic difference for boron up-take indicating that some genotypes can set more grains with the similar level of boron uptake than others
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