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All over the world, attention has been drawn to the use of eco-friendly   biochar application to improve crop productivity. In Ghana, there are   available potential feedstocks left unused and can be used for the   production of biochar. Therefore, this study investigated the effect of   different rates of rice husk biochar and different rates of inorganic   nitrogen (N) on the growth of Zea mays in Nyankpala, Northern Ghana. Field   experiments were conducted in the cropping period of 2012. The treatments   involved 4 different rates of inorganic nitrogen fertilizer (0 kg Nha-1, 30   kg Nha-1, 60 kg Nha-1 and 90 kg Nha-1) and 3 different rates of rice husk   biochar (0 ton ha-1, 2 ton ha-1 and 4 ton ha-1). The treatments were   allocated in a split-plot design with three replications. The vegetative   parameters assessed were the number of leaves, plant height and plant girth.   Treatments showed a significant (p&lt;0.05) influence on all the traits   considered. The combined effects of inorganic nitrogen fertilizer and rice   husk biochar significantly influenced the vegetative growth parameters of   Zea mays with the maximum values recorded at 4 ton ha-1rice husk biochar.   Yet, this observation corresponds with 2 ton ha-1 rice husk biochar which   recorded optimum growth parameters compared to the control. Within the limit   of this work, it was concluded that growth parameters of Zea mays in the   Guinea Savannah Eco-Zone of Ghana could significantly be improved by   applying 4 ton ha-1 rice husk biochar. Integrated soil fertility management   (ISFM), a prudent combination of inorganic fertilizers and residues from   various sources to sustain the environment is currently a necessity. The   experiment revealed that the application of rice husk biochar can improve   the growth parameters of Zea mays. Yet, further experiments need to be done   using higher rates of rice husk biochar to ensure the appropriate rate of   biochar application.

Influence of integrated soil fertility management on the vegetative growth parameters of Zea mays in the guinea savanna eco-zone of Ghana