Demand-Driven Technologies for Sustainable Maize ... - IITA

145Table 2. The F-ratios determined from analyses of variance for soil chemical properties.F ratiosExchangeable cationsExch. aciditypH Source df g c kg-1 OC Total N Ca Mg K Al + Hkg -1 % --------------------cmol ----------------------CECRotation (R) 3 5.9** 12.5** 4.4** 13.8** 41.2** 4.4** 0.9 19.6**Fertilizer (F) 1 25.9** 42.5** 16.9** 98.6** 40.4** 16.9** 0.9 114.6**R x F 3 0.7 1.7 0.1 7.7** 1.1 5.8** 0.3 5.0**, ** Signifi cant F-test at the 0.05 and 0.001 level of probability, respectively.Table 3. Rotation† and fertilizer effects on soil pH of 0-15 cm of a Typic Haplustalf.RotationMS1 MS2 MF MM MeanFertilizer (kg N ha -1 ) ------------------------Organic carbon, g kg -1 -------------------------------0 6.0 6.1 6.2 6.3 6.290 5.5 5.7 5.8 6.1 5.8Mean 5.8 5.9 6.0 6.2LSD (0.01)Rotation (R) 0.45Fertilizer (F) 0.23R x F 0.47† MS1 = TGx 1448-2E-Maize; MS2 = Samsoy-2-Maize; MF = Fallow-Maize; MM = Continuous maize.