| Autor: |
Abreu-Junior CH; Center of Nuclear Energy in Agriculture, Universidade de São Paulo, Av. Centenário 303, Piracicaba 13416-000, Brazil., Gruberger GAC; Center of Nuclear Energy in Agriculture, Universidade de São Paulo, Av. Centenário 303, Piracicaba 13416-000, Brazil., Cardoso PHS; Center of Nuclear Energy in Agriculture, Universidade de São Paulo, Av. Centenário 303, Piracicaba 13416-000, Brazil., Gonçalves PWB; School of Agricultural and Veterinarian Sciences, São Paulo State University, Via de Acesso Prof. Paulo Donato Castellane, s/n, Jaboticabal 14884-900, Brazil., Nogueira TAR; School of Agricultural and Veterinarian Sciences, São Paulo State University, Via de Acesso Prof. Paulo Donato Castellane, s/n, Jaboticabal 14884-900, Brazil.; Department of Plant Health, Rural Engineering, and Soils, São Paulo State University, Av. Brasil n◦ 56, Ilha Solteira 15385-000, Brazil., Capra GF; Dipartimento di Architettura, Design e Urbanistica, Università degli Studi di Sassari, Polo Bionaturalistico, Via Piandanna n◦ 4, 07100 Sassari, Italy., Jani AD; Department of Biology and Chemistry, California State University, Monterey Bay, Seaside, CA 93955, USA. |
| Abstrakt: |
Biological nitrogen fixation in soybean is enhanced when seed is treated with cobalt (Co) and molybdenum (Mo) prior to planting. In this study, our objective was to verify if Co and Mo application during the reproductive phase of the crop increases seed Co and Mo concentration without adverse effects on seed quality. Two experiments were conducted. First, we investigated foliar and soil Co and Mo application under greenhouse conditions. Next, we validated the results obtained in the first study. The treatments for both experiments consisted of Co doses combined with Mo, and a control without Co and Mo application. The foliar application was more efficient in producing enriched Co and Mo seed; meanwhile, as Co doses increased so did Co and Mo concentrations in the seed. There were no adverse effects on nutrition, development, quality, and yield of parent plants and seed when these micronutrients were applied. The seed showed higher germination, vigor, and uniformity for the development of soybean seedlings. We concluded that the application of 20 g ha -1 Co and 800 g ha -1 Mo via foliar application at the reproductive stage of soybean increased germination rate and achieved the best growth and vigor index of enriched seed. |
