Evaluation of the effectiveness of Rhizobium leguminosarum strains for pea under field conditions
van Kessel, C.
Peer Reviewed StatusNon-Peer Reviewed
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One hundred and eight isolates of Rhizobium leguminosarum were screened for effectiveness for pea under controlled environments. Eight superior strains plus the commercially available pea inoculants, Nitragin 'C', Grip-Inotec, and Rhizogen were tested at Waldheim and Brooksby for effectiveness with Tipu and Trapper pea as host plants. The experiment was a RCBD, laid out as a split plot with the two pea varieties as main plot treatments and rhizobia! strain as the subplot treatments, replicated four times. At Waldheim total dry matter ranged from 2429 kg/ha for uninoculated Trapper to 4024 kg/ha for Tipu inoculated with strain 128C79. Grain yield ranged from 1046 kg/ha for Trapper inoculated with strain 175G3 to 1665 kg/ha for Tipu inoculated with strain 175G3. Total grain-N ranged from 33.7 kg/ha for uninoculated Tipu to 55.5 kg/ha for. Trapper inoculated with strain 128C56G. At this site, strain 175G3 appears to be a superior strain for Tipu but is the least effective strain tested for Trapper. At Brooks by, no significant differences due to strain or cultivar were observed. Values for total dry matter, grain yield, and total N were around 75 % of those values found at Waldheim. A survey to assess nodulation was carried out and all uninoculated pea were nodulated. This would indicate the presence of indigenous R. leguminosarum nodulating pea or possible cross contamination from adjacent plots. The below average yield and the absence of a yield response due to inoculation can largely be attributed to the extreme dry weather occurring at both sites. Nodulation of the uninoculated control has also reduced the effect of inoculation on yield.
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