Advances in Optimization of Precision Drip Irrigation and Nitrogen Fertigation for Enhanced Yield and Water Productivity in Semi-Arid Maize Cultivation

Hiroshi Tanaka, Ramesh K. Sharma

Optimizing agricultural water efficiency and nutrient delivery is critical for sustaining cereal crop productivity under escalating climate variability and water scarcity. This field-based empirical investigation evaluates the synergistic effects of precision surface and subsurface drip fertigation regimes on physiological growth, grain yield, and nitrogen use efficiency (NUE) in Zea mays L. over consecutive cropping seasons. The experimental design employed a randomized complete block layout with four distinct water depletion thresholds (40%, 60%, 80%, and 100% crop evapotranspiration) combined with targeted nitrogen splitting strategies. Agronomic results demonstrate that maintaining soil moisture at eighty percent evapotranspiration with four split nitrogen applications significantly increased grain yield by twenty-three percent (9.84 t/ha, p < 0.01) while decreasing total irrigation volume by thirty-one percent compared to conventional flood irrigation practices. Furthermore, leaf chlorophyll fluorescence and canopy temperature measurements confirmed improved physiological drought tolerance and reduced transpiration stress under optimized drip regimes. The study provides scalable agro-technical blueprints for cereal farmers and agricultural extension services in arid and semi-arid agro-ecological zones striving to maximize resource efficiency while minimizing environmental nutrient leaching.

Advances in Antioxidant and Bioactive Properties of Microencapsulated Polyphenolic Extracts from Tropical Fruit Processing Byproducts

Siti Nurhaliza, David Chen

Valorization of agro-industrial byproducts into functional food ingredients represents a key strategy for circular bioeconomy development and food security. This research investigates the extraction efficiency, spray-drying microencapsulation kinetics, and functional stability of polyphenolic antioxidants derived from tropical fruit processing residues (peels and seeds of Mangifera indica and Garcinia mangostana). Utilizing response surface methodology with maltodextrin and whey protein isolate as wall matrices, encapsulation parameters were optimized at 160 degrees Celsius inlet drying temperature. High-performance liquid chromatography and spectrophotometric assays revealed exceptional retention of total phenolic content (88.4%) and DPPH free radical scavenging capacity (IC50 = 14.2 microgram/mL). In vitro simulated gastrointestinal digestion assays confirmed that microencapsulation substantially protected bioactive anthocyanins and mangiferin from premature gastric degradation, enabling targeted colonic bioaccessibility. These empirical findings demonstrate that microencapsulated tropical fruit byproducts possess outstanding thermal and storage stability, making them commercially viable natural antioxidant additives for clean-label food formulations and nutricosmetic products. Furthermore, empirical validation and sensitivity analyses confirm the generalizability of these findings across international operational testbeds. The study articulates vital implementation roadmaps for academic researchers, engineering practitioners, and policy stakeholders aiming to optimize domain performance and sustainable technological leadership.