"BASED ON PREVIOUS KNOWLEDGE OF THE RESEARCH TEAM, RELATED TO REGULATED DEFICIT IRRIGATION AND RECLAIMED WATER USE IN CITRUS AND FRUIT TREES IN MURCIA REGION, OBTAINED IN PREVIOUS PROJECTS AGL2010-17553 AND AGL2010-14861, THIS PROJECT UNITES BOTH RESEARCH GROUPS IN AN INTEGRATED PROJECT TO IMPROVE IRRIGATION MANAGEMENT IN DIFFERENT SCENARIOS OF WOODY CROPS, BASED ON KNOWLEDGE OF THE AGRO-PHYSIOLOGICAL RESPONSE TO DIFFERENT IRRIGATION REGIMES AND WATER QUALITY. IT ESTABLISHES CRITERIA FOR AUTOMATED IRRIGATION SCHEDULING BASED ON MEASUREMENTS OF WATER STATUS OF THE SOIL-PLANT-ATMOSPHERE SYSTEM. FROM AN AGRONOMIC STANDPOINT, THIS PROJECT PROPOSES TO DEEPEN THE KNOWLEDGE OF THE RESPONSE OF CITRUS AND FRUIT TREES (PEACH AND NECTARINE) TO DEFICIT IRRIGATION, AND IN THE CASE OF CITRUS, EVALUATING WITH WATER OF VARYING QUALITY, EVALUATING THE IMPACT ON THE PLANT (VEGETATIVE AND, ESPECIALLY, ROOT GROWTH, PRODUCTION AND QUALITY AND SAFETY OF THE CROP), SOIL (WET-ZONE SIZE, ACCUMULATION OF SALTS AND NUTRIENT AVAILABILITY) AND ANALYZE FROM A HOLISTIC PERSPECTIVE, SUSTAINABILITY IN THE MEDIUM TO LONG TERM OF THE IRRIGATION STRATEGIES PROPOSED. MOREOVER, IMPROVING THE QUALITY AND YIELD OF CROPS, AS WELL AS OPTIMIZATION OF SCARCE RESOURCES IN AGRICULTURE SUCH AS WATER, NEEDS FURTHER BASIC KNOWLEDGE OF THE PHYSIOLOGICAL MECHANISMS THAT ALLOW A SPECIES TO ACCLIMATIZE AND ADAPT TO WATER DEFICIT. TO THIS END, FROM A PHYSIOLOGICAL STANDPOINT, WE WILL ANALYZE THE BEHAVIOR OF CITRUS PHOTOSYNTHESIS UNDER DIFFERENT IRRIGATION CONDITIONS AND QUALITY, STUDYING IN DEPTH THE ROLE OF STOMATAL CONDUCTANCE IN THE TRANSPIRATION, FROM A VALIDATION OF THE MECHANISTIC MODEL WHICH WILL BE SUITABLE FOR FUTURE USE IN AUTOMATED IRRIGATION SCHEDULING. THESE MEASURES WILL BE COMPARED WITH THOSE OBTAINED BY ISOTOPE DISCRIMINATION TECHNIQUES, TO DETERMINE FROM A HOLISTIC POINT OF VIEW THE WATER USE EFFICIENCY OF THE PLANT, THE PATTERNS OF WATER EXTRACTION IN SOIL AND FERTILIZER USE OF THE CROP. THE USE OF RECLAIMED WATER AS A NEW WATER RESOURCE FOR IRRIGATION MAY BE A SOURCE OF NUTRIENTS FOR OUR CROPS, BUT ALSO MAY INVOLVE RISKS OF SALINIZATION AND SOIL POLLUTION. THUS, THE AGRONOMIC AND PHYSIOLOGIC STUDIES PROPOSED BASED ON KNOWLEDGE OF THE EFFECTS OF REGULATED DEFICIT IRRIGATION AND RECLAIMED WATER ALLOW US TO DEVELOP AND VALIDATE NEW ""GOOD PRACTICE GUIDELINES FOR THE USE IN IRRIGATION OF RECLAIMED WATER�. ALSO, AUTOMATED FERTIGATION SYSTEMS WILL BE EVALUATED IN CITRUS AND FRUIT TREES BASED ON SENSORS WHICH INDICATE WATER STATUS OF THE SOIL-PLANT-ATMOSPHERE SYSTEM. THEREFORE, OBJECTIVE CRITERIA WILL ALLOW OBTAINING INDICATION ABOUT WHEN AND HOW MUCH TO IRRIGATE, AVOIDING STRESSES AND/OR EXCESSES IN IRRIGATION DOSES AND FREQUENCY. "