STRESS-ADAPTIVE IRRIGATION AND FERTIGATION

Embodiments of the invention are directed to a sub-surface irrigation system configured to operate in a plant-responsive mode, and further configured to make certain adaptations in response to plant stress. Stress adaptations may include, for example, selectively increasing source pressure of irrigation fluid, heating or chilling the irrigation fluid, and/or injecting fertilizer and/or non-fertilizer amendments into the irrigation fluid. Fig. 1 WO 2021/011746 1/10 PCT/US2020/042282 PERFORMING SUB-SURFACE IRRIGATION VIA MICROPOROUS TUBING TREATED WITH A HYDROPHILIC POLYMER IN A ROOT RESPONSIVE MODE, THE ROOT-RESPONSIVE MODE CHARACTERIZED BY A RELATIVELY LOW SUPPLY PRESSURE AND A CLOSED-END FLUID PATH DETERMINING A PLANT STRESS CONDITION SELECTING A SYSTEM-DELIVERED TREATMENT BASED ON THE PLANT STRESS CONDITION, THE SYSTEM-DELIVERED TREATMENT INCLUDING A RELATIVELY HIGH SUPPLY PRESSURE AND A RECIRCULATING FLUID PATH PERFORMING THE SYSTEM-DELIVERED TREATMENT DETERMINING WHEN TO TERMINATE THE SYSTEM-DELIVERED TERMINATING THE SYSTEM-DELIVERED TREATMENT NO DID SYSTEM-DELIV ERED TREATMENT INCLUDE FLUID AMENDMENT? CLEARING THE SYSTEM