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Two field trials were conducted during the wet season of 2016, one at Samaru (11o11’N, 7o
38’E 686 meters above sea level) in the northern Guinea savannah and the other at Bagauda (11’37N, 8 o 23’E, 500meter above sea level) in the Sudan savannah of Nigeria, to study the performance of two soybean varieties as influenced by Sowing method and weed control treatments. The experiment consisted of two varieties of soybean, (TGX 1448-2E and TGX 1987-10F), two Sowing methods (Dibbling and drilling) and four weed control treatments. Pendimethalin at 2.0kg a.i kg/ha applied as pre-emergence, fusillade 2.0 a.i kg/ha applied as post emergence, hoe weeding at 3, 6 and 9 WAS and weedy check. The treatments were laid in a split plot design with factorial combinations of weed control treatments and sowing method assigned to the main plot, while variety was assigned to the sub-plot. The results show that variety TGX 1448-2E recorded lower weed dry weight and produced taller and more vigorous crop plants that had wider canopy and higher grain yield at both locations than TGX 1987-10F. Drilling method of sowing recorded less weed dry weight, weed cover score, and produced more vigorous crop plants with wider canopy cover, higher total dry weight than the dibbling method of sowing. The weedy check plots recorded significantly higher weed dry weight, weed cover score and weed density than all the other weed control treatments. The treatments with fluazifop-butyl (fusillade) at 2.0kg a.i/ha resulted in significantly taller plant height with wider canopy cover and more vigour crops thanPendimethalin at the same rate. On the other hand, hoe weeding at 3, 6, and 9WAS recorded higher seed yields than other weed control treatments.
Soybean (Glycine max (L) Merrill) is a member of the Leguminosae family and subfamily
Papilinoideae. Soybean is an annual herbaceous legume that originated from North-eastern
China and has been cultivated for the past three millennia (Simmondet al., 1999). The crop is
now cultivated throughout the world with the largest production in the United State of
America, Brazil, China and Argentina (Javaheri and Baudoin, 2001).
Soybean which is popularly known as golden bean has become a miracle crop of the 21st
century because it is widely cultivated throughout the world. The world production figure for
soybean as at 2013 is about 283millions tonnes. While Nigeria production is 58 tonnes.
Soybean is an excellent health food crop, containing 40-44% protein, which is more than in
other food crops and common vegetable sources in Nigeria (Thakareet al., 2006). The protein
yield of soybean on dry matter basis is about twice that of meat and most beans and nuts and
four times that of milk (Dalleyet al., 2004). Soybean seed contains about 20% oils on dry
matter basis and it is 85% unsaturated and cholesterol-free. It also contains 20% carbohydrate
and 0.69% phosphorous (Oyekan, 1987). The seed is used in making soymilk (Kanaseet al.,
2006). The crop has been described as the world cheap source of edible vegetable oil and
protein in livestock feeds (Dalleyet al., 2004). It is a primary source vegetable of oil in local
and international markets. It has the capability to fix 45-60kg/ha atmospheric nitrogen in the
root nodules and adds about 0.5-1.5 t/ha organic matter through leaf fall (Kurehet al., 2005).
Soybean cultivation has expanded as a result of its nutritional and economic importance and
diverse domestic uses.
1.1 Production and Economic Importance
Soybean is among the major industrial and food crops grown in every continent of the world.
The crop can be successfully grown in many states in Nigeria using low agricultural inputs
(Dugje, 2009. Soybean cultivation in Nigeria has expanded as a result of its nutritive and
economic importance and the diverse domestic uses (Omoigui, 2009). The crop is also an
excellent source of vegetable oil in the international market.
Soybean is an annual grain legume crop that provides about one –quarter of the world dietary
protein. According to Ezedinma, (1994), soybean and other leguminous crops are essential
sources of plant protein for about 700 million people. About 35-40% of the total dry matter
content of the whole soybean is protein. It compares favourably with animal protein sources
and contains the most essential amino acids required by man. It has digestible nutrients of
about 92%, which makes it a good source of energy (Mijindadi, 1987).
Soybean contributes to the improvement of soil fertility by fixing 60-70 kg-N-ha
atmospheric nitrogen in the soil for the subsequent crop (Khan et al., 2005). The crop has an
average protein content of 40% and is more protein –rich than any of the common vegetable
crops or animal food sources found in Nigeria (Dugje et al., 2009). The crop can be used as
soy-milk and vegetable oil. Soybean seed contains about 20% oil on a dry matter basis,
which is 85% unsaturated and cholesterol- free (Kanase et al., 2006)
1.2 Weed Infestation and Control in Soybean
Reduction in soybean yield due to weed infestation varies from 27-77%, (Fletcher et al.,
1992) depending on the type of weeds and weed infestation intensity, soil type and rainfall
pattern. It was reported that yield declined by as much as 84% as a result of weed infestation
(Mijindadi, 1987) .Weed infestation removed 21.4 kg N and 3.4 kg P per hectare in soybean
(Hailu, et al., 2010).
It was reported that two hand hoeing was very effective in suppressing weeds and increasing
soybean seed yield (Ahmed et al., 2001). The conventional methods of weeding such as
hoeing and hand pulling are expensive, laborious and the labour is not available during peak
period of weeding (Khan et al., 2001). Presently, there is a
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