Responses of mungbean lines to rhizobium inoculation
1987
Sawai Phongkao | Rungsarid Kaveeta | Peerasak Srinives
General observation on nodule formation was also done weekly using plants on outside rows. Nodules on tap roots were noticed on the first week but nodules on branch roots were formed later at the third week. Nodules on the tap and branch roots increased rapidly and reached its maximum at full bloom or young pod formation. In average nodules on branch roots were about 3 to 4 folds more than on tap root of the same plant in almost every line tested. Every line responded differently to the nodule formation, inoculated treatment was superior to the no-inoculation either on quantity and efficiency. The presence of nodules on the no- inoculation treatment indicated that natural population of Rhizobia or population of Rhizobia from previous crops were present in the soil. Lines that were well nodulated and produced efficient nodules with relatively high yield whether inoculated or not inoculated were as follows:VC 2742-36-3B, VC 2742-38-3B, VC 2745-8-3B, VC 2745-9-3B and VC 2745-20-3B. Some lines were high in yield inspite of the fact that few nodules or no nodule were formed. Those lines were VC 2745-2-3B, VC 2745-11-3B, VC 2755-29-3B, VC 2785-2-3B and Uthong-1. These lines are genetically variable and it is also possible that either basic soil fertility or added fertiliser or both are sufficient for growth.
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