TABLE 4.

Number of studies reporting significant and non-significant genotype, cropping system, and interaction effects, categorized by cereals.

	Cropping system effect			Genotype effect			Interaction effect
Cereal	sig.	n.s.	n.r.	sig.	n.s.	n.r.	sig.	n.s.	n.r.
Barley	2	1	2	2	1	2	2	1	2
Maize	12	8	9	12	9	9	19	7	4
Millet	2	0	5	1	0	5	5	0	1
Oat	5	0	4	3	0	6	6	0	3
Rice	1	0	4	2	0	3	2	0	3
Sorghum	1	0	4	2	0	3	1	0	4
Wheat	4	2	3	3	2	4	2	4	3
Total	27	11	31	25	12	32	37	12	20

sig., significant; n.s., not significant; n.r., not reported.