Abstract
The study was conducted during 2009/2010 dry season at locations (11o 58’ N, 8o 25’E and 110 39’N, 080 027’ E) both located in the Sudan Savanna Ecological Zone of Nigeria. The study was aimed at evaluating the response of cowpea varieties to sowing dates and irrigation intervals. The treatments consisted of three cowpea varieties (IT93K-452-1, Achishru and IT97K-205-8), three sowing dates (Early - February, Mid - February and Early - March) and three irrigation intervals (5, 10 and 15 days). Results obtained showed that IT97K-205-8 out - yielded the other varieties. Early sown crops resulted in significant increase in pod number and pod weight per plant, number of seed and seed weight per pod, seed weight per plant and grain yield per hectare. Delaying in sowing dates significantly reduced all the yield characters assessed. Scheduling irrigation at 10 days interval significantly increased number of pods and pod weight per plant, seed weight per pod, 100-seed weight and seed weight per plant at both sites. Highly significant and positive correlation coefficient was observed between cowpea grain yield and seed weight per plant, pod weight per plant, and number of pods per plant.
Keywords:
arbuscular mycorrhizae
prevalence
rhizophere soils
infection
root
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