title: Evaluation of maize yield in an on-farm maize-soybean and maize-Lablab crop rotation systems in the Northern Guinea Savanna of Nigeria.
abstract: An attempt was made to solving the problem of shortfall of fertilizer to maize production in the Northern Guinea Savanna (NGS) of Nigeria by harnessing the potentials of legume/cereal crop rotation in on-farm trials. The yield of maize that succeeded two soybean varieties and Lablab in a two-cycle of soybean/maize and Lablab/maize crop rotation in NGS Nigeria was assessed in researcher-managed and farmer-managed plots. Though maize that followed the soybean received between 5 kg N ha(-1) from improved soybean variety (TGx 1448-2E) and 17 kg N ha(-1) from farmer soybean variety (Samsoy-2) as N balance, this did not significantly (p = 0.05) affect the maize yields. The soybean shed 90-100% of its leaves at physiological maturity which resulted in about 110 kg N ha(-1) N uptake. This source of N might be one of the factors responsible for the increase in maize yield that followed soybean (20 to 24%) compared with continuous maize yield plot. Maize yield in previous Lablab plot was significantly (p = 0.05) higher than in all other treatments. Maize yield in farmer-managed plot ranged between 0.13 and 4.53 t ha(-1), maize yield in researcher-managed plot was over 200% higher than maize yield in farmer-managed plot because of poor crop management on the part of the farmer.
authors.affiliation: International Institute of Tropical Agriculture (IITA), P.M.B. 5320, Oyo Road, Ibadan, Nigeria.
authors.forename: J A
authors.initials: JA
authors.lastname: Okogun
authors.forename: N
authors.initials: N
authors.lastname: Sanginga
authors.forename: R C
authors.initials: RC
authors.lastname: Abaidoo
mesh_terms: D000383:Agriculture / Q000379:methods*; D018556:Crops, Agricultural / Q000254:growth & development; D008954:Models, Biological; D009549:Nigeria; D009584:Nitrogen / Q000737:chemistry / Q000378:metabolism*; D009586:Nitrogen Fixation; D012987:Soil; D013025:Glycine max / Q000378:metabolism*; D003313:Zea mays / Q000378:metabolism*
chemical_list: D012987:Soil; D009584:Nitrogen