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Effect of Seaweed on the Levels of Available Phosphorus and Nitrogen in a Calcareous Soil¹

The objective of the present investigation was to study changes in levels of phosphorus and nitrogen in soils supplemented with dry, ground seaweed, KNO₃, and KH₂PO₄ After intervals of 21, 42, 76, and 105 days, phosphorus, nitrate, and ammonium were determined. The results showed that the seaweed affected the status of total inorganic N and P in the soil

In all systems the levels of available inorganic phosphorus increased. However, part of the N that was added as nitrate or that was originally present in the soil was immobilized. The results further indicated that inorganic P of seaweed origin was probably in a form other than simple phosphate.

² Professor of Analytical Chemistry. Faculty of Chemistry and Pharmacy, University of Chile.

³ Assistant Professor of Analytical Chemistry. Faculty of Chemistry and Pharmacy. University of Chile.

Received for publication May 31, 1967.