Soybean treated with bioagents and grown after cover crop mixes
Adriano Stephan Nascente1, Laylla Luana de Melo Frasca2, Marta Cristina Corsi Filippi3
1Brazilian Agricultural Research Corporation (EMBRAPA), Rice and Beans, Brazil
The search for cultivation practices that provide productive, social and environmental increments to the agroecosystem is of great importance for the sustainable intensification of agriculture. The objective of this work was to determine the effect of multifunctional microorganisms (MM) and cover crop mixes on gas exchange, grain yield and production components of soybean plants. In the field experiment, a randomised block design was used in an 8×2 factorial scheme, consisting of the combination of eight vegetation covers and the use or not of a MM mixture. The cover crops were composed of: 1. Intercrop 1 (white lupinus (Lupinus albus), buckwheat (Fagopyrum esculentum), white oat (Avena sativa), black oat (Avena strigosa), Crotalaria ochroleuca, C. Juncea, fodder turnip (Brassica rapa), coracana grass (Eleusine coracana)); 2. Intercrop 2 (buckwheat, C. spectabiliis, fodder turnip, black oat); 3. Intercrop 3 (Millet (Pennisetum glaucum), C. ochroleuca, black oat, white oat, buckwheat, coracana grass); 4. Intercrop 4 (C. spectabilis, buckwheat, millet and C. breviflora); 5. Intercrop 5 (black oats, buckwheat, millet, piatã (Urhocloa brizantha, cv Piatã) and C. ocholeuca); and 6. Intercrop 6. (black oats, fodder turnip, white lupine, coracana grass, buckwheat), 7. Fallow; 8. Corn (Zea mays); 3. The MM mixture used was Serratia marcenses (BRM 32114) + Bacillus spp. (BRM 63573), and its control (without microorganisms), with four replicates. Soybean plants co-inoculated with S. marscenses + Bacillus spp. showed an increase in photosynthetic rate (16.65%), stomatal conductance (37.50%), mass of 100 grains (4.04%) and grain yield (14.83%). No differences were observed between the cover crops used prior to soybean cultivation. Therefore, the use of multifunctional microorganisms is a strategic technology aimed at the sustainable intensification of agriculture.
Keywords: Cover crops, Glycine max, productivity, rhizobacteria
Contact Address: Adriano Stephan Nascente, Brazilian Agricultural Research Corporation (EMBRAPA), Rice and Beans, P.O. Box 179, Highway 462, km 12, 75375000 Santo Antônio de Goiás, Brazil, e-mail: adriano.nascenteembrapa.br