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Phosphorus Supplying Capacity of Lowland Rice Soils¹

ABSTRACT

In a greenhouse experiment with rice (Oryza sativa L.) on four lowland soils, Milfor 6(2), an indica variety from the Philippines, was used to test the relative utilization of soil and fertilizer P (P³²-labelled superphosphate) at various N rates. Added P remaining in solution in six soils was also determined using Ca (H₂P³²O₄)₂ at various equilibration times.

From 8 to 27% of the total P in the plant was derived from applied P, the amount presumably depending on the availability of soil P under continuous submergence. In general the amount derived was not affected by different levels of N fertilization. The results indicate that, by using the ‘A’ value concept, the rice plant itself gives an indication of the P supplying capacity of some flooded rice soils. Results also show that within 4 days of equilibration the added P remaining in solution was lowest in acid latosolic soils containing kaolin type minerals, moderately high in soils containing mainly montmorillonite, and essentially unaltered in calcareous soil.

¹ Contribution from The International Rice Research Institute, Los Baños, Laguna, The Philippines. Presented before Div. S-4 and S-8, Soil Science Society of America, Columbus, Ohio, Nov. 3, 1965.

² Associate Agronomist, Agronomist, and Research Scholars, respectively, to The International Rice Research Institute.

Received for publication February 24, 1966. Accepted for publication May 27, 1966.