engleski

Seasonal phenology dynamics of alfalfa consociation with Italian ryegrass based on NDVI from Sentinel-2

Understanding of the specificities of phenological dynamics is essential for the reliable estimation and classification of crops by satellite imagery. This study analysed the seasonal dynamics of the normalized differential vegetation index (NDVI) of alfalfa and Italian ryegrass from the Maksimir test field at University of Zagreb Faculty of Agriculture, and explained its dynamics through utilisation and weather conditions during 2018 and 2019. Temporally and spatially, the NDVI values ranged from 0.28 to 0.82. The results showed the specificities of vegetation index dynamics caused by mowing and regeneration, with the highest values recorded in April and very strong positive correlation of NDVI to dry matter of aboveground biomass y = 13.2*x-9.2 (r = 0.951, p <0.05) suggesting the possibility of estimating the yield of alfalfa consociation with the Italian ryegrass using Sentinel 2 imagery. By connecting meteorological data and phenological dynamics of NDVI, the extent to which thermal stress can influence NDVI values and dynamics of primary production respectively is shown.

NDVI ; Sentinel-2 ; monitoring ; phenological dynamics ; satellite imagery

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