ChileanJAR

A potted trial was carried out in order to study the effects of three phosphorus levels on dry matter production and nitrogen, phosphorus and potassium content in Red Kidney c.v. bean plants under greenhouse conditions.
Plants were grown in four alluvial soils: Pirque, Maipo, Lo Herrera and Santiago from the Santiago Province.
Phosphorus applications increased considerably the phosphorus content in each soil, and also increased the relative and absolute contents in the plants. Howerer, the dry matter production did not increase.
Significant differencies were not found in the percent and absolute phosphorus content between the plants which received 10 and 20 ppm of phosphorus.
This suggests that plants reached the maximun phosphorus levels with the adition of 10 ppm of phosphorus (50 Kg/ha of P₂O₅).
The relative and absolute contents of nitrogen and potassium in plants were not affected by phosphorus applications.
The type of soil was the most influencing factor on dry matter production, and the greatest biological yields were observed in soils with the highest organic matter contents.