Variations in the absorption of phosphorus from superphosphate-32P in field experiments with soyabean (Glycine max L.) and pea (Pisum sativum L.)
Variations in the absorption of phosphorus from superphosphate-32P in field experiments with soyabean (Glycine max L.) and pea (Pisum sativum L.)
Ghelfi, R.A.; Ezcurra, U.S.A.
Revista de Ciencias Agrarias 1(1): 36-43
1980
In field trials in 1972-9, 4 with soyabean SRF or Cerillos W65 and 2 with green peas Early Perfection, at San Pedro, Baradero and Ezeiza, 30 kg P/ha was applied as triple superphosphate. Weeds reduced the uptake of P in both crops by 50 to 80%. In soyabean, 35% of the total P at 34 days was derived from the fertilizer placed 5 cm below the seeds but later the percentage diminished.