DOI: 10.36347/sjavs.2016.v03i07.004

Pages: 463-473

The study was conducted at University of Cape Coast Research Farm, Cape Coast, Ghana from September, 2014 to April, 2015. The objective of the research was to investigate the effects of irrigation levels, chicken manure, cow dung, NPK and interactions on the: growth and yield of OFSP. Sixteen treatments (four levels of irrigation and four soil amendments) with three replicates were laid out in a Randomized Complete Block Design (RCBD). Irrigation did not influence significantly soil physical properties studied; Bulk density, Pore volume and Particle density. Water stress (DI, 70% CWR) increased tuber yield and water use efficiency (WUE) as compared to 100% CWR while growth of leaves and branches were reduced. PM + 70 % CWR produced the highest tuber yield (10.56 kg m-3) as compared to PM + 100 % CWR (4.87 kg m-3), PM + 90 % CWR (6.21 kg m-3) and PM + 80 % CWR (6.51 kg m-3). Deficit irrigation reduced vine yield. Soil amendment improved significantly tuber yield better under reduced irrigation (70% CWR) conditions than under full irrigation.