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GROWTH AND YIELD OF SOYABEAN (Glycine max (L.) Merrill) AS AFFECTED BY NITROGEN AND PHOSPHORUS FERTILIZATION
Abstract:
A field experiment was conducted during the 1990 cropping season at Sarnaru, northern Guinea Savana Zone of Nigeria to investigate the response of soyabean (C.V. SAMSOY 2) to different levels of nitrogen and phosphorus fertilizer. Treatments consisted of factorial combinations of four levels each of nitrogen (O, 20, 40 and 60kg N ha ) and phosphorus (O, 17, 35 and 52kg P ha ) laid out in a randomized complete block design and replicated four times. -1 The application of N at the rate of 20kg N ha increased Modulation significantly at the initial growth stage. Increasing the level of N above 20kg N ha ” resulted in decreased number of nodules. Although N enhanced plant growth, it had no significant effect on grain yield. Modulation was increased significantly by phosphorus fertilizer application. Similarly P enhanced plant growth up to the highest level of applied P (52kg P ha ), but grain yield responded up to 17kg P ha -1 • Grain yield reduction was as much as 54% when no P fertilizer was applied (1325kg ha ). The nitrogen concentration in plant decreased with increasing N application while increasing P fertilizer application increased grain nitrogen concentration. The interaction between N and P was significant on some growth parameters but not on grain yield and yield component
GROWTH AND YIELD OF SOYABEAN (Glycine max (L.) Merrill) AS AFFECTED BY NITROGEN AND PHOSPHORUS FERTILIZATION
