Published in Scientific Papers. Series A. Agronomy, Vol. LXII, Issue 1
Written by Victor PETCU, Ion TONCEA
Early recognizing of plant growth variability can aid in identifying yield-limiting factors such as genotype, soils, nutrient availability and/or environmental limitations. Normalized Difference Vegetation Index (NDVI) is considered as a potential screening tool for estimation of grain yield in wheat. NDVI has been associated with percent ground cover, leaf area index (LAI), biomass accumulation, and nitrogen use efficiency. In this study we use NDVI to established variability in growth of several winter wheat genotypes and relationships with grain yield under ecological agriculture system. For recording the value of NDVI, Green seeker (Trimble) was used. NDVI values were measured at different stage of vegetations through the growing seasons of 2017- 2018 in winter wheat (Triticum aestivum L.) grown at southeast part of Romania (Fundulea) on cambic chernozem soil and 1-2-3-4 years alfalfa stands. Results showed differences in growth of different winter wheat genotypes could be identified with NDVI index. At the stage of tillering, stem elongation and anthesis the relationship between LAI and NDVI is positive and linear while during at grain filling and maturity stage were not correlations. The relationship between NDVI and grain yield was also established. There was the simple correlation between grain yield and NDVI scores at the time of tillering, stem elongation and anthesis, in both seasons, and insignificant association between grain yield and NDVI was also found at grain filling and maturity stage. This demonstrated the opportunity to use this index in characterizing production potential of different winter wheat cultivars under ecological agriculture system.
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