INCREASING RICE PRODUCTIVITY THROUGH INTEGRATED NITROGEN SOURCES UNDER THREE SOIL MANAGEMENT SYSTEMS ON A VERTISOL

D. K. Anning, J. Ofori, F. K Kumaga, I. K. Addai

Abstract


Rice production in Ghana is relatively low partly due to poor nitrogen and soil management. To increase rice productivity in the country, a field experiment was carried out to assess the effect of nitrogen sources and soil management systems on grain yield, plant nitrogen uptake, nitrogen use efficiency, and chemical properties of the soil. The experiment was conducted at the Soil and Irrigation Research Centre, University of Ghana, Kpong during the 2015 and 2016 cropping seasons and laid out in a split plot design with three replications. Soil management systems and nitrogen (N) sources were the main and sub plot factors respectively. Soil management systems included; continuously flooded (S1), alternate wetting and drying (S2) and aerobic (S3) while the nitrogen sources included no nitrogen fertilizer (N0), urea fertilizer (N1), compost fertilizer (N2) and integrated urea and compost fertilizer (N3). Results from the study revealed that S2 recorded similar grain yield, plant N uptake and N use efficiency of rice as S1. Treatment N3 produced the optimum grain yield and nitrogen use efficiency. S2N3 treatment interaction produced the highest grain yield and N use efficiency. Crop residues left after harvest should be composted and used to improve soil chemical properties as well as increase rice yield.

Keywords: Compost, nitrogen use efficiency, rice, soil chemical properties, vertisol


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