Peppers in "sky villas," lettuce in nutrient baths—Nanjing is pioneering agriculture's future. Through soilless cultivation and vertical farming, innovators are boosting both yield and quality, transforming urban farming.     At a compact 4-acre experimental farm, hydroponic towers and aeroponic systems nurture 40,000 plants. Hydroponics star here, eliminating soil pests while optimized nutrients produce robust roots, rapid growth, and superior flavor. Technicians credit meticulous irrigation and nutrient balancing by agricultural experts.     From tomatoes to leafy greens, just two workers manage the entire operation—seed to harvest—drastically cutting labor costs. With expansion plans underway, this high-efficiency model could soon spread across the region, redefining sustainable farming.