Responses of groundnut cultivar Tainan 9 to different N fertilizer levels and rhizobium inoculation (dry season, using residual moisture)
1988
Banyong Toomsan | Viroj Moasaen | Nilubol Tiengtae (Khon Kaen Univ., Khon Kaen (Thailand). Faculty of Agriculture. Dept. of Plant Science)
There were eight treatments in the study: 0 kg. N/rai (T1), 3 kg. N/rai (T2), 6 kg. N/rai (T3), 12 kg. N/rai (T4), 18 kg. N/rai (T5), 24 kg. N/rai (T6), 32 kg. N/rai (T7) and 0 kg. N/rai plus Rhizobium inoculation (T8). Rhizobium inoculation treatment had the highest nodule number and nodule dry weight per plant. Nodule number and nodule dry weight per plant tended to increase when low levels of N fertilizer were applied (T2 and T3), but decreased with higher rates of N fertilizer. N2-ase activity followed the same trend as nodule number and nodule dry weight. Highest nitrogenase activity was found in T2, followed by T8 and T3, respectively. Lowest nitrogenase activity was found in T7. Plant dry weights at 60 days after planting, dry stover yields, and dry pod yields at final harvest of the different treatments were not significantly different. However, Rhizobium inoculation and N fertilizer application had a tendency to increase all these three parameters, and the control treatment gave lowest values in all the three characters. The results confirm the finding in the rainy season of 1985 that dry pod yield is not an appropriate character for measuring response to N fertilizer which will indicate the potential response to Rhizobium inoculation. Another alternative character should be sought.
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