Correlative analyses of LAI, NDVI, SPAD and biomass of winter wheat in the Suburb of Xi´an

In a five-time field experiment in Xian (in central China), a ground-based integrated sensor and instrumentation system was developed to measure real-time crop conditions indicators: the NDVI, SPAD, LAI and Biomass. The NDVI value was obtained by GreenSeeker, the SPAD value was obtained by SPAD502, the LAI value was obtained by CI-110 and CI-203, and the samples were collected simultaneously to estimate the biomass. The results show that the integration sensor and instrumentation system supports multi-source information acquisition and management in the farming field. By processing the measured data and simulating the above data´s correlation, LAI, NDVI, SPAD value are increasing over time in a certain range, the correlations about NDVI and SPAD, NDVI and LAI are positive, The LAI and biomass were closely related in the growth stage of winter wheat.