Abstract
ABSTRACT Low bioavailability of soil phosphorus (P) often limits N2 (nitrogen) fixation and crop production in large parts of the tropics. The efficiency of P acquisition and P use by 21 genotypes of pigeonpea [Cajanus cajan (L.) Millsp.] were studied in a pot experiment using two cowpea [Vigna unguiculata (L.) Waip.] genotypes as controls. The short-duration genotypes produced more dry matter, accumulated more P, and produced more dry matter per unit of absorbed P than the medium-and long-duration genotypes. Dry-matter production correlated positively with the P uptake (r2 = 0.72) and P-use efficiency (r2 = 0.86). The P uptake correlated positively with the P-use efficiency (r2 = 0.36); whereas the P-use efficiency correlated negatively with the P-uptake efficiency (r2 = 0.50). Root surface did not determine P acquisition of pigeonpea, which absorbed 1.6 mg P cm−3 from 33 cm3 soil compared with 0.17 mg P cm−3 from 387 cm3 soil for cowpea at 66 d.
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