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Short Report

ScienceAsia 5 (1979): 043-047 |doi: 10.2306/scienceasia1513-1874.1979.05.043

 

RHIZOSPHERE INFLUENCE AS AN EXPLANATION FOR THE LACK OF RESPONSE OF LOWLAND RICE TO PHOSPHATE FERTILIZATION

 

A.K. ALVA, S. LARSEN and S.W. BILLE

Summary: Our recent investigation on P transformations in lowland rice rhizosphere revealed that P is being mineralized during the early growing period followed by its immobilization. This has a significant role in P nutrition of lowland rice. The extent of respective processes depends on crop growth (P requirement) and level of P application (P availability). Such a regulatory mechanism, apparently due to unique physiological characterisrics of lowland rice plants, is mainly responsible for the lack of response of lowland rice to P fertilizalion.

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Department of Soil Fertility and Plant Nutrition, The Royal Veterinary and Agricultural University, Thorvaldsensvej 40, Entrance 8, Copenhagen V. Denmark

Received 29 November 1978