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Science 27 April 1990:
Vol. 248. no. 4954, pp. 477 - 480
DOI: 10.1126/science.248.4954.477
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Articles

Phosphorus Uptake by Pigeon Pea and Its Role in Cropping Systems of the Indian Subcontinent

Noriharu Ae 1, Joji Arihara 1, Kensuke Okada 1, Teruhiko Yoshihara 1, and Chris Johansen 2

1 Legumes Program, International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Patancheru Post Office, Andhra Pradesh 502 324, India
2 Department of Agricultural Chemistry, Hokkaido University, Sapporo, Hokkaido, 060, Japan

Pigeon pea was shown to be more efficient at utilizing iron-bound phosphorus (Fe-P) than several other crop species. This ability is attributed to root exudates, in particular piscidic acid and its p-O-methyl derivative, which release phosphorus from Fe-P by chelating Fe3+. Pigeon pea is normally intercropped with cereals under low-input conditions in the Indian subcontinent. Although pigeon pea can utilize the relatively insoluble Fe-P, intercropped cereals must rely on the more soluble calcium-bound phosphorus. This finding suggests that cultivation of pigeon pea increases total phosphorus availability in cropping systems with low available phosphorus.


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