Probability of yield response to inoculants in fields with a history of soybean.

摘要: Inoculants containing Bradyrhizobium japonicum are available for soybean [Glycine max (L.) Merr.] production but may not be necessary in fields where previously has been produced. The objective of this study was to determine yield response and probability an economic return from inoculants with a recent history production. Fifty-one inoculant products were evaluated experiments (n = 73) conducted Indiana, Iowa, Minnesota, Nebraska, Wisconsin between 2000 2008. Inoculant similar did produce relative untreated control different zero (P > 0.05) at 63 environments. Probability break-even sale price $0.33 kg -1 59% 36% Wisconsin, 25% 4% Iowa. Attaining on investment 67 ha (a 2:1 return) reduced success 11, 2, 1, 7, 0.2%, the five states, respectively. Data range environments indicate that application offers limited either increase or improved soils grown upper Midwest.