1. Adu-Gyamfi J J, Fujita K and Ogata S 1989 Phosphorus absorption and utilization efficiency of pigeon pea (Cajanus Cajan ( L.) Millsp) in relation to dry matter production and dinitrogen fixation. Plant Soil 119, 315–324.
2. Adu-Gyamfi J J, Katayama K and Ito 0 1999 Below-ground interactions and nitrogen management in cereal/legume intercropping in the semi-arid tropics. Jpn. J. Crop Sci. 67 (extra issue 2), 233–236.
3. Ae N, Arihara J, Okada K, Yoshihara T and Johansen C 1990 Phosphorus uptake by pigeon pea and its role in cropping systems of the Indian subcontinent. Science 248, 477–480.
4. Amijee F, Barraclough P B and Tinker P B 1991 Modeling phosphorus uptake and utilization by plants. In Phosphorus Nutrition of Grain Legumes in the Semi-Arid Tropics. Eds. C Johansen, KK Lee and KL Sahrawat. pp. 63–76. 1CRISAT, Patancheru, India.
5. Anghinoni I and Barber S A 1980 Phosphorus influx and growth characteristics of corn roots as influenced by phosphorus supply. Agron. J. 72, 685–688.