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RESPONSE OF SOYBEAN [Glycine max (L.) Merr.] VARIETIES TO INOCULATION AND SOWING DATE IN GUINEA SAVANNA, NIGERIA
Abstract
Nigeria, being the largest producer and consumer of soybean in sub-Saharan Africa, requires stable and sustained
production of the crop to meet its increasing demand for human consumption, and source of feed for the poultry
industry. A field trial was conducted during the 2018 rainy season at the research field of International Institute of
Tropical Agriculture, University farm of Ahmadu Bello University, Zaria at Samaru,in the Northern Guinea
Savanna, and International Institute of Tropical Agriculture research farm, Kubwa, Abuja in the Southern Guinea
Savanna of Nigeria. The treatments consist of four varieties of soybean (TGx 1904-6F, TGx 1951-3F, TGx 1955-
4F and Sambaiba), two sowing dates (late June and early July), and two levels of inoculation (inoculation and
without inoculation). The treatments were laid out in a Randomized Complete Block Design (RCBD), replicated
three times. The results revealed that the rhizobia inoculated treatments had significantly (P≤ 0.05) taller plants
(89.97 cm), and higher grain yield per hectare (2145kgha-1). Plant height, days to 50% flowering, and grain yield
per hectare (2035.7kg kha-1) responded significantly (P≤ 0.05) to sowing date. Late June sowing outperformed
early July sowing in these parameters. The results also indicated that the varieties TGx 1951-3F (2172.18kgha-1)
and Sambaiba (2240.3kgha-1) out yielded the other varieties at Kubwa and Samaru respectively. Based on the
results obtained from this study, it can be concluded that application of rhizobia inoculant, late June sowing date,
use TGx 1951-3F and Sambaiba varieties produce the highest grain yield per hectare in the Guinea Savanna of
Nigeria.
