Phosphorus fertilizer rate trials in Finland 1977 - 1994

The phosphorus fertilization requirement at the improved soil fertility level was studied with long-term field experiments at 37 sites during 1977 - 1994. The effects of five different rates of annual phosphorus application (0, 15, 30, 45, 60 kg P/ha) on field-crop yields and quality were investigated. The phosphorus requirements under diverse soil conditions were studied by means of chemical plant and soil analyses. See: Saarela, I., Järvi, A., Hakkola, H. & Rinne, K. 1995. Fosforilannoituksen porraskokeet. Maatalouden tutkimuskeskus. Tiedote 16/95. (In Finnish with English summary)