Alternatives to Seed-packet Inoculation of Soybeans with Rhizobium japonicum1
- Kuell Hinson2
This study tested two methods for inoculating soybean (Glycine max L. Merrill) plots with Rhizobium japonicum. In one method, inoculant mixed with moist builders sand was drilled in rows before planting. When applied at 10 times the recommended rate (10×), it produced 63 and 78% as many nodules as 10× and 1× seed inoculation, respectively. Nodulation was essentially equal at placement depths of 4 and 6.5 cm. Plantings made 15 days after application had 80% as many nodules as those made 1 day after application.
In the second method, 100 kg/ha of inoculated soybeans were sown with a grain drill and grown for 6 weeks to pre-inoculate fields. Nodulation in subsequent plots, without further inoculation, was good when plants from the grain drill seeding averaged five or more nodules each before they were disked under. When plants from the grain drill seeding averaged 2.5 nodules each, temporary symptoms of nitrogen deficiency developed in subsequent plots.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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