Evaluation of LAI Dynamics by Using Plant Canopy Analyzer and Its Relationship to Yield Variation of Soybean in Farmer Field

Soybean yield largely varies spatially and yearly in farmer fields. Appropriate growth diagnosis is recommended to stabilize the yield. Leaf area index (LAI) a representative diagnostic item, but an evaluation method of LAI dynamics with has not been established. In this study, we utilized function consisting exponential power math function. Parameters were derived from be analyzed variability. The was measured weekly by plant canopy analyzer fields for 4 years. parameterized fitting relationship between parameters soybean analyzed. well fitted at R2 = 0.82~0.90 RMSE 0.54~0.69 m2 m−2. function, such as maximum (LAImax) cumulative temperature (TLAImax), quantified spatial differences dynamics, partly explaining those study considered robust quantify diagnose production. quantification may help develop crop monitoring UAVs (Unmanned Aerial Vehicles) remote sensing new tool.