Supplemental irrigation for dry-spell mitigation of rainfed agriculture in

Supplemental irrigation can be defined as the addition of small amounts of water to essentially rainfed crops during times when rainfall fails to provide sufficient moisture for normal plant growth, in order to improve and stabilize yields. 'A chemical fertilizer is defined as any inorganic material of wholly or partially synthetic origin that is added to soil to sustain plant growth. 
doi:10.1016/S0378-3774(03)00008-8