1989 Volume 38 Issue 12 Pages 505-508
Distribution and uptake rate of42KCl solution when applied as foliar fertilizer were measured.42 KCl tracer solution was prepared by the milking method from42Ar-42K generator. The total uptake ratio of 42K was about 20% in 24 h. To enhance the uptake rate and amount, leaf moisturing method was effective, which raised the uptake ratio three times higher. When the solution was applied at the back side of the leaf, the absorbed amount was 10 to 20% higher than that amount applied at the surface side of the leaf. The amount of 42K uptake measured in this report suggests that the foliar fertilization of K can be the econo-mical way of fertilization in Brazil.
