Root and Shoot Dry Weight Response to Glomus Clarum for Some Selected Cowpea (Vigna Unguiculata (L.) Walp) Varieties under Alectra Vogelii Inoculated Soil
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Abstract
This research was conducted to evaluate the effect of Glomus clarum on the root and shoot dry weight of four cowpea varieties on Alectra vogelii inoculated soil. Four cowpea varieties used were: SAMPEA 7, IFE 82-12, IT97K-499-35 and TVX 3236. The sterilized sandy-loamy soil used for this experiment consisted of mixture of top soil and sand in ratio 1:1 (v/v). Glomus clarum was applied in five rates: the control without Alectra, control with Alectra, 10, 20 and 30 g/pot. A constant quantity of Alectra (3.3 g/pot) was maintained. The treatments were arranged in complete randomized design. Four cowpea seeds were planted per pot but later thinned to two seedlings per pot at two weeks after planting (WAP). These cowpea plants were sampled for root and shoot dry weight at 5, 7 and 9 WAP. Most Glomus clarum treatments indicated a significant increase (p ≤ 0.05) on root and shoot dry weight of cowpea varieties. Glomus clarum treatment at 30 g/pot resulted in the highest root and shoot dry weight which was comparable with the two control treatments and significantly higher with that due to all the other treatments respectively. Cowpea variety SAMPEA 7 mostly resulted in higher values compared with other cowpea varieties for root and shoot dry weight at 9 WAP. From this study, Glomus clarum treatment at 30 g/pot increased root and shoot dry weight of the cowpea varieties compared to other treatments, therefore, is recommended as a biological control agent.
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