ChileanJAR

Potted experiments were carried-out using 50 different soil samples from the Osorno province, Chile. Indicator plant was rye-grass (Lolium perenne X lolium multiflorum). The fertilization treatments were: (a) N as ammonium nitrate; (b) NP as ammonium nitrate and triple superphosphate, and (c) NPKS as ammonium nitrate, triple superphosphate and potassium sulfate.
These experiments confirm the importance of the deficiencies of phosphorus, potassium and sulfur, previously diagnosed by the technique of the lacking element.
A review of the information that has been obtained in with field experiment, in that zone is inclueded. In general, the results of these experiments support the validity of the deficiencies identified with pot trials which includes principally the P, K, S and Mg, but not calcium.
Conclusions from both groups of experiments -in pots and field- agree in not giving importance to calcium deficiency unless the soil is a "ñadi".