Soybean can be a viable alternative crop for lowlands. However, soybean relies on biological nitrogen fixation, a process that is normally affected by soil flooding, depending on the macrosymbiont genotype. Moreover, the behavior of different bradyrhizobia strains in flooded soil is yet unknown. The present research aimed to evaluate the efficiency of Bradyrhizobium elkanii and Bradyrhizobium japonicum strains recommended for soybean in comparison to mineral nitrogen fertilization, in flooded soil. The experiment was carried out in a greenhouse, where soybean […]

This study was carried out in the 1994/95, 1996/97, 1997/98 and 1998/99 cropping seasons, to evaluate the efficiency of the Bradyrhizobium strains as recommended by research, evaluation and biological nitrogen fixation efficiency of competitiveness of soybean crop under no-tillage. The experiments were carried out at FUNDACEP, in Cruz Alta, Rio Grande do Sul, Brazil, in an area cultivated under no-tillage over five to ten years. In the year of 1994/95, the treatments were: non-inoculated control; 200 kg ha-1 of nitrogen […]

Soybean [Glycine max (L.) Merrill] inoculation and reinoculation are essential to guarantee the maximization of the biological N2 fixation process. Most inoculants commercialized for soybean in Brazil are peat-based, but there are doubts about the dose of peat inoculant which should be recommended, specially under stressing conditions or in areas previously inoculated. Therefore, for the central region of Brazil, the recommendation is 1.000 g of inoculant/50 kg of seeds, with a sugar cane solution as adhesive. However, in this study […]

Soybean [Glycine max (L.) Merrill] plants establish a symbiosis with bacteria belonging to the genus Bradyrhizobium, realizing the biological N2 fixation process. The inoculation with selected rhizobial strains guarantees the maximization of the biological process. In Brazil, almost 13 million doses of inoculants, mainly peat based, are commercialized annually. However, the peat adhesion to the soybean seeds is low, requiring the use of adhesives. The current recommendation is the use of a water sugar cane solution at 25%, but this […]

Phosphorus is the macronutrient that most often contributes to increasing the productivity of crops in Brazil. It has been shown that certain Rhizobium-plants symbiosis require higher levels of phosphorus, as compared to the nitrogen- fertilized plants. Several different ways of placing soluble phosphate were tested for both common beans and chickpea crops, with the objective of increasing the efficiency of using phosphorus available in the soil without increasing fertilizer amount. The common bean crop set up in Jaguapitã (PR), was […]