DESEMPENHO AGRONÔMICO E ESTADO NUTRICIONAL DA CULTURA DA SOJA EM CONSÓRCIO COM ESPÉCIES FORRAGEIRAS TROPICAIS

• DOI: https://doi.org/10.22533/at.ed.2311425140412

• Palavras-chave: Glicine max. Palhada. Cobertura morta. Megathyrsus. Urochloa.

• Keywords: Glicine max, Straw, Mulch, Megathyrsus, Urochloa.

• Abstract: Early sowing of forage crops over late-cycle soybeans (overseeding) produces straw after harvest, thus ensuring the continuity of an integrated production system such as Integrated Crop-Livestock (ILP) and Crop Consortium (CC). In addition, the no-tillage system (NTS) is a soil management system that aims to ensure the sustainability of Cerrado soils and benefits grain crops. In this context, the objective of this research was to evaluate the effect of forage straw under intercropping in overseeding on the agronomic characteristics of soybeans, as well as its relevance to their nutritional status. Six forage cultivars were used intercropped with soybean in superseeding in three harvests (2020/2021; 2021/2022; 2022/2023) adopting a randomized block design with four replications, as follows: cv. Ipyporã (Urochloa brizantha x Urochloa ruziziensis); CV. Piatã (Urochloa brizantha); CV. Mombaça (Megathyrsus maximus); CV. Zuri (Megathyrsus maximus); CV. Kenya (Megathyrsus maximus); and cv. Tamani (Megathyrsus maximus). The experiment was conducted in a randomized block design with four replications. The data obtained were subjected to statistical analysis using the Tukey test with a significance level of 5%. Intercrops with forages showed the same effects on PG. The NGV and NGP production components and the PFP and RS characteristics had significant effects with the consortia, varying in the 2020/2021 and 2021/2022 harvests. In all harvests, forage plants of the genus Megathyrsus obtained the highest averages in pre-sowing residue production. The N, P, K, Ca and S contents of the leaf tissue were at the ideal nutritional level for all consortia, only Mg did not reach ideal levels.