Journal ArticleDOI
The number of Bradyrhizobium sp. (Lupinus) applied to seed and its effect on rhizosphere colonization, nodulation and yield of lupin
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Observations have important implications for setting new standards for commercial inoculants and for emphasizing the care needed in handling inoculated seed to reduce the death of bradyrhizobia in the period between inoculation and sowing.Abstract:
In field experiments we investigated the roles of inoculum potential of Bradyrhizobium sp. ( Lupinus ) and quantity of peat used to inoculate seed on the nodulation and yield of lupins. Within the range 0.125–3 times the Australian recommended rate of peat application (2.5 g peat kg −1 lupin seed), the amount of peat had no effect on nodulation or grain yield. In the first experiment, seven inoculum potentials were applied within the range log 10 0.32–6.28 bradyrhizobia per seed in 7, 10-fold increments which spanned the recommended rate of login 5.55 per seed. Inoculum potentials of log 10 6.27 and 5.27 improved the colonization of lupin rhizospheres and increased early nodulation, nodule number and nodule mass. Nodule mass was increased from 65 to 393 mg plant −1 at 43 days by increasing the inoculum from log 10 4.27 to 6.27 bradyrhizobia seed −1 . Grain yield and % N in the grain were not significantly different ( P > 0.05) between potentials of logio 4.27 and 6.27. In the second experiment, higher potentials of 6.80 and 7.28 further improved rhizosphere colonization and increased nodule mass. Studies of the survival of the inoculum, during inoculation, sowing and in the soil, identified a large mortality factor; 95% of bacteria died between inoculation and sowing and of those surviving, 83% died after 22.5 h in the soil. These observations have important implications for setting new standards for commercial inoculants and for emphasizing the care needed in handling inoculated seed to reduce the death of bradyrhizobia in the period between inoculation and sowing.read more
Citations
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Journal ArticleDOI
Legume seed inoculation technology—a review
TL;DR: A better understanding of the mechanisms involved in the protection of rhizobia from adverse conditions will assist in defining the optimum conditions for seed inoculation and storage to ensure a higher quality product for farmers at the time of sowing.
Book ChapterDOI
Manipulation of rhizobia microflora for improving legume productivity and soil fertility: a critical assessment
TL;DR: This paper considers ways and means by which populations of root-nodule bacteria can be manipulated ecologically, agronomically, edaphically and genetically to improve legume productivity and, as a consequence, soil fertility.
Journal ArticleDOI
Trends in rhizobial inoculant production and use
TL;DR: The need for an increase in quality standards is discussed especially for the number of rhizobia delivered per seed and for the presence of contaminants.
Journal ArticleDOI
Recent advances in inoculant technology and prospects for the future
TL;DR: It seems clear that world-wide production of legume inoculant is static or in decline, a paradoxical situation in a world where improved strategies for augmenting biological N2 fixation have the potential to contribute enormous returns in the quality and quantity of food for humans and domestic animals.
Journal ArticleDOI
Failure of inoculant rhizobia to overcome the dominance of indigenous strains for nodule formation
TL;DR: Key worcls: competitiveness, nitrogen fixation, rhizobial ecology, Blncl~rliizobi~~rri, and prospects for the future.
References
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A. N. Sharpe,A. K. Jackson +1 more
TL;DR: An entirely new mixing device, particularly suitable for preparing bacterial suspensions from foods, fabrics, swabs, and other fairly soft materials, has been developed, which is vigorously pounded on its outer surfaces by paddles when placed inside the machine.
Journal ArticleDOI
Growth and Survival of Rhizobium spp. in Peat Culture
R. J. Roughley,J. M. Vincent +1 more
TL;DR: The growth and survival in peat culture of 3 strains of Rhizobium representing 3 inoculation groups, were affected by the source of the peat, pH and method of pH adjustment, method of sterilization, drying temperature and moisture content.
Journal ArticleDOI
Effects of lupin-wheat rotations on soil fertility, crop disease and crop yields
TG Reeves,A Ellington,HD Brooke +2 more
TL;DR: Three experiments, begun in successive years, were conducted between 1974 and 1979 in north-eastern Victoria to investigate the effects of rotating wheat and 'sweet' lupins on crop yields, soil fertility and crop diseases.