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Objetivou avaliar a acao de bioestimulantes sobre caracteristicas agronomicas e produtividade para a cultura da soja, em condicoes de baixa e alta dose de fosforo. O delineamento experimental utilizado foi o de blocos casualizados, com quatro repeticoes, sendo tres bioestimulantes e uma testemunha. As caracteristicas avaliadas foram as caracteristicas agronomicas (AP = altura de planta; AIV = altura de insercao da 1a vagem; NVP = numero de vagem por planta; NSP = numero de sementes por plantas; e PCS = pesos de cem sementes) e a produtividade (PROD). Os ambientes com altas doses de fosforo proporcionaram os maiores valores de AP (70,3 cm), NVP (138,8), NSP (301,5) e PROD (2868,76 kg ha-1). Quanto as caracteristicas AIV e PCS, no ambiente com alta dose de fosforo, nao houve diferenca estatistica entre os tratamentos. Os melhores valores de AP, NVP e NSP sao obtidos nos tratamentos T11 e T12, enquanto para PROD, no T13, em ambos os tratamentos destaca-se o bioestimulante, BU-EC. A alta dose de fosforo influencia as variaveis AP, NVP, NSP e PROD, entretanto, as doses de fosforo nao influenciam as variaveis AIV e PSC. Action biostimulants performance of soybean under two phosphorus fertilization Abstract: This study aimed to evaluate the action of biostimulants on agronomic characteristics and yield for soybean, in low and high phosphorus level. The experimental design was a randomized complete block with four replications, with three biostimulants and a witness. The characteristics were evaluated for agronomic traits (PH = plant height, HPI = height of first pod insertion; NPP = number of pods per plant, NSP = number of seeds per plant, and WHS = weight of one hundred seeds and PROD = Productivity). Environments with high levels of phosphorus gave higher values of PH (70.3 cm), NPP (138.8), NSP (301.5) and PROD (2868.76 kg ha-1). Regarding the characteristics HPI and WHS, the environment with a high dose of phosphorus, there was no statistical difference between treatments. The best values of PH, NPP and NSP are obtained in treatments T11 and T12, while for PROD at T13 in both treatments highlight the biostimulant, BU-EC. The high dose of phosphorus influences the variables PH, NPP, PROD and NSP, however, the phosphorus levels do not influence the variables HPI and WHS.

Ação de bioestimulantes no desempenho do cultivo de soja em duas condições de adubação fosfatada