[01] Olasan Joseph Olalekan, Plant Science and Biotechnology Unit, University of Agriculture Makurdi, Makurdi, Benue State, Nigeria. [02] Aguoru Celestine Uzoma, Plant Science and Biotechnology Unit, University of Agriculture Makurdi, Makurdi, Benue State, Nigeria. [03] Ekeruo Godspower Chibuike, Plant Science and Biotechnology Unit, University of Agriculture Makurdi, Makurdi, Benue State, Nigeria. [04] Ani Ndidiamaka Juliana, Plant Science and Biotechnology Unit, University of Agriculture Makurdi, Makurdi, Benue State, Nigeria. [05] Azande Wueseter Christian, Plant Science and Biotechnology Unit, University of Agriculture Makurdi, Makurdi, Benue State, Nigeria.

A study on the comparative effects of organic sources of manure as well as inorganic fertilizer on the performances of selected soybean varieties was undertaken. The experimental set up was a completely randomized design (a 17 x 3 factorial treatment structures) consisting of 17 treatments combination and 3 Soybean varieties, replicated twice. Significant variety effect was observed on plant height two weeks after treatment (2WAT), days to flowering, plant height 5WAT, number of stem, stem circumference, leaf length, plant spread, number of leaves, number of pods and pod length. The effect of fertilizer type on growth and yield of soybean was found to significantly influence stem circumference and number of leaves. The interaction of variety x fertilizer type was found to only produce significant effect in the number of leaves and number of pods in soybean. The mean performance of the three different soybean varieties applied with organic and inorganic fertilizers revealed that variety TGx-1448-2E produced longer plant spread (34.28 cm), followed by variety TGx-1955-4E (31.69 cm) and then variety TGx-1904-6F (31.69 cm). The average number of pods (13.38 pods) obtained for variety TGx-1955-4E was more and significantly higher than the reduced number of pods counted for varieties TGx-1904-6F and TGx-1448-2E with an average of 9.79 pods and 10.43 pods respectively. Pod length of variety TGx-1904-6F was longer (3.69 cm), significantly more than pod length of 3.30 cm and 2.73 cm measured for varieties TGx-1955-4E and TGx-1448-2E respectively. The main effect of fertilizer type on growth and yield of different soybean varieties showed that fertilizer combination of poultry litter + goat dung at 7.5g had significantly high stem circumference (2.41 cm) and number of leaves (48.00 leaves). Interaction effect of variety x fertilizer showed that the application of poultry litter +goat dung fertilizer combination at the rate of 7.5g produced the highest number of leaves in TGx-1448-2E variety (59.00 leaves). Also, application of cow dung + poultry litter + goat dung at the rate of 5g gave higher number of pods (22.00 pods) for variety TGx-1955-4E. The findings of this study shows the response of TGx-1955-4E soybean variety to increasing number of pods with the use of organic manure combinations (particularly cow dung + poultry litter + goat dung at the rate of 5g and 7.5g as well as poultry litter + goat dung manure combinations at 7.5g rate), will be advantageous in increasing yield.

Soybean, Animal Waste, Growth, Yield

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