EFFECT OF TEMPERATURE ON GROWTH AND YIELD OF BAMBARA GROUNDNUT (VIGNA SUBTERRANEAN (L.) VERDC.) DURING EARLY AND LATE SEASON DROUGHT
Bambara groundnut is an indigenous legume that is still cultivated in subsistence agricultural systems in sub-Saharan Africa, despite any major research effort until recently. The variable and hostile climates in the region mean that annual yields of Bambara groundnut are far below their agronomic or genetic potential. This study was initiated to evaluate the effect of temperature on growth and yield performances of landraces during early and late season droughts. Over the summer months of 2006, 2007 and 2008 two distinct Bambara groundnut landraces, Uniswa Red (Swaziland) and S-19-3 (Namibia), were grown under two temperatures. 23±5°C (LT) and 33±5°C (HT). at the five glasshouses of the Tropical Crops Research Unit (TCRU), University of Nottingham, School of Biosciences, Sutton Bonington Campus, United Kingdom (52°50N; 1°15W; 45 m altitude). Soil moisture in each glasshouse was non-limiting in 2006, whereas late and early season droughts were imposed in 2007 and 2008 respectively. Sequential growth analysis was conducted at two weeks intervals from sowing to harvesting. On average, leaf area index (LAI) was significantly lower (p<0.05) in LT compared to HT in all three experiments. However, significantly higher (p=0.04) LAI was reported for Uniswa Red compared to S-19-3 at final harvesting. Similarly, reported total dry matter (TDM) was significantly (p<0.05) higher in HT for both landraces compared to LT. In contrast, LT reported significantly higher (p<0.05) pod yield during late season compared to HT; the significant interaction (p=0.020) indicating that the size of this effect differed between landraces. Under the soil moisture limited condition, there was a significant interaction for LAI on 103 days after sowing (p=0.007) indicating the two landraces were responding differently to temperature.
Karunaratne, A.S., Crout , N.M.J., Al-Shareef, I. and Azam-Ali, S. (2013). EFFECT OF TEMPERATURE ON GROWTH AND YIELD OF BAMBARA GROUNDNUT (VIGNA SUBTERRANEAN (L.) VERDC.) DURING EARLY AND LATE SEASON DROUGHT . Acta Hortic. 979, 661-667
landraces, glasshouse, leaf area index, total dry matter, soil moisture