Table 1.

Yield losses in some major crops caused by drought and heat stress.

Crop species	Stress	Yield losses (%)	Reference
Maize (Zea mays L.)	Drought	63–87	Kamara et al., 2003
	Heat	42	Badu-Apraku et al., 1983
Wheat (Triticum aestivum L.)	Drought	57	Balla et al., 2011
	Heat	31	Balla et al., 2011
Rice (Oryza sativa L.)	Drought	53–92	Lafitte et al., 2007
	Heat	50	Li et al., 2010
Chickpea (Cicer arietinum L.)	Drought	45–69	Nayyar et al., 2006
Soybean (Glycine max L.)	Drought	46–71	Samarah et al., 2006
Sunflower (Helianthus annuus L.)	Drought	60	Mazahery-Laghab et al., 2003