Nodulation et rendements du soja Glycine Max L. Merill inocule par Bradyrhizobium japonicum dans differents systemes de culture a Kombe-Brazzaville (Congo).
1994
Mandimba G.R. | Makela E. | Moussongo P. | Pandzou J.
Trials were conducted to determine the persistence of introduced Bradyrhizobium japonicum strains on the performance of uninoculated Glycine max L. Merill under various cropping systems. Cropping systems were: (i) inoculated soybean by four B. japonicum FA3, 3-40, SA1 and GS3 strains followed by uninoculated soybean FN3 (csi); (ii) inoculated soybean genotypes FN3, Jupiter and IRAT 274 by B. japonicum FA3 strain, followed by fallow followed by uninoculated soybean IRAT 274 (csii). Liming was applied in the two management practices, but chemical fertilizers such as P and K were added in the second cropping system but not in the first one. Under (csi), the nodulation in soybean FN3 was effective with nodule numbers per plant ranged from 27 to 51, while yields were low and may be attributed to the lack of applied mineral fertilizers. The nodulation in soybean IRAT 274 was also effective under (csii) with nodule numbers ranged from 19 to 45, but nodule occupancy by FA3 strain was low and ranged from 1.2 to 24.5 per cent. In addition, yields of soybean IRAT 274 ranged from 1.84 t per ha to 3.69 t per ha depending on the levels of applied P and K fertilizers and were greater than the unfertilized and uninoculated control (1.52 t per ha). These results suggest that the persistence of performances of soybean-B. japonicum symbiosis is related to the cropping systems.
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