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
O60

Speargrass fallow105028481949
Cassava300227382870
Pigeonpea242229722697
Cowpea-maize-cowpea167023281999
Mucuna-maize-mucuna297041953582
Maize-maize-maize138021281754

Mean20822868

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 sequenceN rate (kg ha−1) Mean
O60

Speargrass fallow585790686
Cassava270300285
Pigeonpea390500445
Cowpea-maize-cowpea325395360
Mucuna-maize-mucuna300345323
Maize-maize-maize240430335

Mean351460

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].