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This article in SSSAJ

  1. Vol. 30 No. 5, p. 613-617
     
    Received: Feb 24, 1966


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doi:10.2136/sssaj1966.03615995003000050023x

Phosphorus Supplying Capacity of Lowland Rice Soils1

  1. S. K. DeDatta,
  2. J. C. Moomaw,
  3. V. V. Racho and
  4. G. V. Simsiman2

Abstract

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.

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