On-farm reduced irrigation and fertilizer doses, and arbuscular mycorrhizal fungal inoculation improve water productivity in tomato production

•Mycorrhizas increased fruit yield, and quality with reduced fertilizer doses.•Deficit and optimized irrigation increased tomato yield and fruit size, but not quality.•Mycorrhiza-inoculated plants sustained yield levels with reduced fertigation.•Input efficiency should define mycorrhizal inoculant use and management.