PRECISION RESOURCE MANAGEMENT AND CROP SYSTEM INTENSIFICATION FOR ENHANCING PRODUCTIVITY UNDER CLIMATE VARIABILITY

Abstract

Global agricultural systems face unprecedented challenges from population growth, land degradation, and climate variability, necessitating a paradigm shift from uniform input management toward precision-based intensification strategies. This review synthesizes current knowledge on precision resource management (PRM) and crop system intensification (CSI) as complementary frameworks for enhancing agricultural productivity under variable climatic conditions. The paper examines four interconnected technological pillars: (1) site-specific nutrient management (SSNM) employing the 4Rs framework (right product, rate, time, and place) integrated with diagnostic tools including canopy reflectance sensors, chlorophyll meters, and decision-support software, achieving nitrogen savings of 10-80% while reducing greenhouse gas emissions by up to 50%; (2) sensor-based irrigation coordination under system of crop intensification, demonstrating that sprinkler irrigation at 80% evapotranspiration combined with SPAD-guided nitrogen top-dressing increased soybean yields by 25.6% and economic water productivity by 27.5 INR ha⁻¹ m⁻³; (3) conservation agriculture principles of minimal soil disturbance, permanent organic cover, and diversified rotations, which when combined with precision nutrient placement improved system productivity by 5.7-24.6% and water-use efficiency by 18.4-39.0%; and (4) laser land leveling as a structural precursor, delivering irrigation water savings of 15-25% and yield increases of 12-21.5%. The integration of these precision technologies with high-density planting architectures and advanced modeling tools demonstrates substantial potential for sustainable intensification. However, successful implementation requires context-specific adaptation, farmer capacity building, and supportive policy frameworks to address regional soil, climatic, and socio-economic variations.