Abstract
A glasshouse pot experiment was conducted to determine whether P deficiency in cowpea (Vigna unguiculata) cv. Vita 4 could be corrected, using topdressed P, following early detection by plant analysis. Seven P treatments, applied to a P-deficient grey-podzolic soil were: a treatment that received 240 kg P ha−1 before sowing; and treatments that received 10 kg P ha−1 before sowing plus six topdressed treatments (0, 30, 70, 150, 230 and 350 kg P ha−1) applied at 14, 21, 28, 35, 42, 49 or 56 d after sowing (DAS). Basal nutrients were applied and the seed was inoculated with Bradyrhizobium CB756 at sowing. Plants supplied only with 10 and 240 kg P ha-1 before sowing were harvested for dry matter yield at 14, 21, 28, 35, 42, 49 and 56 DAS and for seed yield at 87 DAS. Youngest fully-expanded leaves (YFEL) were obtained at the seven earlier harvests and analysed for P. Topdressed plants were harvested for seed at 87 DAS.
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