Effects of Cropping System and Cowpea Variety on Symbiotic Potential and Yields of Cowpea (Vigna unguiculata L. Walp) and Pearl Millet (Pennisetum glaucum L.) in the Sudano-Sahelian Zone of Mali

Table 2

Cropping system effects on cowpea nodules number (nodules/plant), nodules dry weight (mg/plant) at bloom stage, and cowpea and millet grain yield (kg/ha) in farmers’ fields in 2010.

Cropping systems	Cowpea nodules number by plant	Cowpea nodules dry weight (mg/plant)	Cowpea grain yield (kg/ha)	Millet grain yield (kg/ha)
Farmers’ control	No^*	No^*	No^*	465^a
Cowpea variety CZ11-94-5C sole crop	22^a	160	730^a	No^*
Cowpea variety IT89KD-374 sole crop	16^b	117	605^b	No^*
Millet/CZ11-94-5C alternate rows intercropping (1 row/1 row)	20^ab	140	390^c	335^b
Millet/IT89KD-374 alternate rows intercropping (1 row/1 row)	15^b	119	340^cd	350^b
Millet/CZ11-94-5C alternate rows intercropping (2 rows/1 row )	23^a	163	280^cd	485^a
Millet/IT89KD-374 alternate rows intercropping (2 rows/1 row)	17^b	139	245^d	495^a
Effect	𝑃 value	𝑃 value	𝑃 value	𝑃 value
Cropping system	<0.01	0.09	<0.01	<0.01
Coefficient of variation (%)	37.02	45.21	42.17	21.41

Means followed by the same letters in the same column are not significantly different (𝑃≤0.05), according to Duncan test.
No^*: no millet.