Soybean cultivar production under application of varying effective microorganism rates
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Abstract
The objective of this study was to evaluate the response of soybean cultivars under the application of different doses of Effective Microorganisms [EM-1]. The field experiment was conducted at Estancia La Margarita II, San Pedro, Department of San Pedro, Paraguay, at an elevation of 200 m a.s.l., at coordinates 23°40′38.5″S, 56°54′24.7″W. A randomized complete block design was used, with eight treatments and three replications, totaling 24 experimental units in a 2 × 4 factorial arrangement: factor A = soybean cultivars and factor B = EM-1 dose. Data were subjected to analysis of variance, and means were compared using Tukey’s test at the 1% and 5% significance levels; regression analysis was also performed. Measurements included plant height at 30, 60, and 90 days after sowing [DAS], number of pods per plant, number of grains per pod, and yield (kg ha-1). The statistical analysis showed that plant height differed significantly for factor B (EM-1 dose) at 30 DAS and highly significantly for both factors at 60 and 90 DAS, with a significant interaction only at 90 DAS. For pods per plant, both factors and their interaction (A × B) were highly significant, whereas grains per pod showed no statistical differences. Regarding yield, significant differences were found for both factors; notably, the 30 L ha⁻¹ EM-1 dose achieved the highest yield (1,916.16 kg ha-1), corresponding to a 29.68% increase.
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