RICE WATER INDEX UNDER WATER STRESS AND HIGH TEMPERATURE CONDITIONS
The objective of this experiment was to determine water index of rice crop through crop temperature (Tc), soil temperature (Ts), ambient temperature (Ta) and NDVI (Normalized Difference Vegetation Index). The experiment was realized at Tonosi, Los Santos, Panama (between 7º26’03’’ N and 80º24’37’’ W, at 18 masl), from August 2016 to December 2017. IDIAP 38 and IDIAP 145-05 varieties were tested, under rainfed and supplementary irrigation planting conditions, in 100 m2 plots (by variety and planting condition) and four treatment replicates. Samples were taken every eight days and NDVI, crop moisture content, Ta, Tc, Ts, and temperature water indexes (Tc-Ta and Ts-Ta) were determined. Results indicate that grain yield and water status of crop through the complete phenological cycle are not correlated. However, crop moisture and crop yield showed a highly significant positive correlation, during the grain filling stage. In this stage, positive correlations between crop moisture, soil moisture and NDVI were also found. Crop moisture, Tc and Tc-Ta showed a negative correlation. Crop humidity, Ts, Ta and Ts-Ta, were not correlated. For IDIAP 38 and IDIAP 145-05, indexes that best correlate with the water state of crop were NDVI, Tc and Tc-Ta.
| Main Authors: | , , , |
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| Format: | Digital revista |
| Language: | spa |
| Published: |
Instituto de Innovación Agropecuaria de Panamá
2018
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| Online Access: | http://www.revistacienciaagropecuaria.ac.pa/index.php/ciencia-agropecuaria/article/view/158 |
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