The effect of foliar applications with potassium nitrate and urea phosphate on soybean yield was studied. Four experiments were conducted at four different locations in Argentina (Table 1). A single foliar spray was applied in the R3 growth stage (pod initials). Greatest yield was obtained with a mix of 6% potassium nitrate (7,5 kg/ha) and 2% urea phosphate (2,5 kg/ha), applied in 120 L/ha (Figure 1).
Table 1. Foliar treatment details on soybean.
Figure 1. The effect of foliar sprays on soybean yield at 4 different locations in Argentina.
Melgar, R., M.E. Camozzi, M. Torres Duggan and J. Lavandera. 2001. Evaluación de Magnum P44 y nitrato de potasio en soja. INTA, Centro Regional Buenos Aires Norte, Estación Experimental Agropecuaria Pergamino: 1-3.