Synopsis Citrus Nutrition has been the subject of exclusive investigation worldover during the last 50 years or so, effectively. Resultantly, innumerable technologies came into practice in many commercial citrus orchards, needless to elucidate the consequences of these. However in the light of changing global environment and consequent upon them, the newly emerging nutritional problems made citrus nutrition, a more popular and burning issue with regard to sustaining the quality citrus production. Precise identification of nutrient constraints right at the field, an effective amelioration technology, combating various limitations offered by soil, and accordingly simulating the nutritional requirement through studies on root configuration, characterizing nutrient uptake behaviour, and addressing salinity borne problems besides using organic citrus culture, all constitute important components of an effective citrus nutrition programme. These issues are portrayed nicely with the help of 17 chapters supported by nearly 5000 citations which promises to attract a worldwide readership.