Table 1.

Overview of data included in the meta-analysis.

Crop	Studies	Comparisons (Yield)	Countries	Open-field	Greenhouse
Potato	33	77	14	33	0
Tomato	40	82	16	26	14
Pepper	18	34	11	12	6
Eggplant	20	56	10	15	5
Onion	26	70	12	25	1
Cucumber	20	39	8	9	11
Muskmelon	16	34	8	13	3
Watermelon	14	33	7	14	0
Overall	185	425	30	145	40