Effect of Sowing Dates on Yield and Yield Components of Cowpea Infected with Scab

G.A. Mbong ； C.N. Akem ； O. Alabi ； A.M. Emechebe ； M.D. Alegbejo

《Asian Journal of Agricultural Sciences》 2卷2期 (2010/04) Pp. 57-62

並列摘要

The aim of the study was to investigate the effects of cowpea scab infections on yield and yield components of three cowpea varieties, TVx 3236, SAMPEA-6 and IT93K452-1. Fields experiments were carried out during three consecutive cropping seasons of 2004, 2005 and 2006 at the Institute for Agricultural Research Farms at Samaru and Shika, Nigeria. Four different plantings were made at 7-day interval starting from late July and ending in mid August of each year. Scab disease incidence ratings were taken at 42 and 49 days after sowing, during each season. Crop yields and yield components were estimated at the end of each season. The design used was a factorial concept in a randomized complete block design with three replications consisting of single row plots, each 75 cm wide, 6 m long, and 75 cm apart. For all the 3 seasons, the early sown cowpeas had higher-scab incidences and the yield and yield components of this early sown cowpea were lower than those from late sown crops. The grain yields from the early sown crops were of poor quality, with lots of shrivelling, while those from late sown crops were of good quality. The disease reduced grain yield through scab's deleterious effect on yield components. The correlation of scab infected plant parts with yield and yield components was positive and significant for SAMPEA-6 and IT93K452-1 but IT93k452-1 showed some variations in correlations. The correlation of scab on the yield and yield components of TVx 3236 was negative and not significant.

並列關鍵字

Correlation ； cowpea ； scab ； Vigna unguiculata ； yield ； yield components