Ecological studies and symbiotic performance of soybean Rhizobia under different cropping systems in Northeast Thailand
1995
Luangchaisri, N.
Generally, seed inoculation, regardless of inoculation rates, significantly increased nodulation by twice as much as the uninoculated treatments. However, the significant differences were not always obtained in the soils previously planted to soybean. Nodulation was also influenced by soil cropping history. The highest nodulation was found in the soils previously planted to soybean. Crop responses in terms of shoot total N, shoot dry weight and grain yield were significantly increased by seed inoculation in most cases even in the soils previously planted to soybean. On the other hand, soil cropping histories had no significant effect on these parameters only in one location. Inoculation of the preceding soybean crop significantly increased nodule dry weight and shoot dry weight of the succeeding soybean. However, no significant effect was observed in other growth parameters. Nodulation, root dry weight and shoot total N were greatly improved by reinoculation of the following soybean crop. The number of introduced rhizobia in the simulated plots gradually decreased from 2.5 x 10 to the fourth power to 2.5 x 10 to the third power cells/g within 11 weeks in the absence of host plant. However, in the plot where the host plant was present, the population increased to nearly the initial level after a 5-week decline. When soil moisture stresses were imposed, drastic decreases of population were observed especially in the plot without the host plant. The initial decreases of population depended on rate of inoculation. High rate of inoculation showed more drastic decrease during the first week as compared to the low inoculation rate
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