Table 2: Effect of crop sequence and N rate on (a) maize grain yield (kg ha−1) and (b) weed biomass (kg ha−1) associated with the maize crop at 8 weeks after planting on researcher-managed plots.

(a)

Crop sequence N rate (kg ha−1) Mean O 60 Speargrass fallow 1050 2848 1949 Cassava 3002 2738 2870 Pigeonpea 2422 2972 2697 Cowpea-maize-cowpea 1670 2328 1999 Mucuna-maize-mucuna 2970 4195 3582 Maize-maize-maize 1380 2128 1754 Mean 2082 2868

SED: crop sequence (CS) = 318.4; N rate (NR) = 115.3; CS NR = 375.8. P < F: CS = 0.001; NR = 0.001; CS NR = 0.01. Source [9].

(b)

Crop sequence N rate (kg ha−1) Mean O 60 Speargrass fallow 585 790 686 Cassava 270 300 285 Pigeonpea 390 500 445 Cowpea-maize-cowpea 325 395 360 Mucuna-maize-mucuna 300 345 323 Maize-maize-maize 240 430 335 Mean 351 460

SED: crop sequence (CS) = 65.9; N rate (NR) = 52.4; CS NR = 112.1. P < F: CS = 0.001; NR = 0.05; CS NR = NS. Source [9].