Reduction of evapotranspiration due to soil water deficit is quantified by CDI (Crop Drought Index). It is an agricultural drought index. The relationship was examined between precipitation P and CDI for sugar beet in Kujawy region for different soils. Evapotranspiration reduction was estimated on the basis of model research conducted for the growing season of sugar beet (21.04–30.09) in the years 1954–2003 and for 4 soils, with different total available soil water (103, 137, 165, 203 mm) in the 1-m profile. Relations between P and CDI were studied in 5 time periods, created by adding another subsequent phenological phases of sugar beet. The significance of the relationships was evaluated by using statistical analysis. The correlation coefficients showed the share of precipitation in the reduction of evapotranspiration of sugar beet in relation to potential evapotranspiration. The determined monograms can be useful in determining CDI on the basis of current measurements of precipitation. ...
The system of drought monitoring has been performed by the Institute of Technology and Life Sciences in Bydgoszcz since 2008. Meteorological drought is evaluated using SPI (Standardized Precipitation Index) and agricultural drought - using CDI (Crop Drought Index). CDI is calculated with the linear regression relationships between CDI and SPI. Prediction of meteorological and agricultural drought is made in the 10-day periods, using the forecast of precipitation obtained from WetterOnline.The verifiability of SPI forecast was high (80-100%). The verifiability of CDI depended on crop type and soil water retention - it ranged from 50 to 100%. The differences in drought classes were determined only in several cases.Monitoring and estimation of drought are the base of decision and activi-ties making in agricultural production, water management in the rural areas, irri-gation and estimation of yield losses. ...
Since 2012 Institute of Technology and Life Sciences has lead a national agro-meteorological monitoring in rural areas. The system provides current and forecasted information on the status and impact of water shortages in selected, representative of agricultural ecosystems and estimates potential reduction of crop yield. Required meteorological data are provided by a network of automatic stations located in 13 regions on Polish territory. Weather forecasts, necessary to develop predictions of water shortages in the next 10 and 20 days, come from the meteorological service of MeteoGroup Poland. Monitoring of water deficits and their consequences is carried out on using an indicator method. Precipitation conditions are monitored using standardized precipitation index SPI, soil moisture - soil moisture index SMI, the deficit of water for crops - agricultural drought index CDI and the potential reduction of final yield - yield reduction ratio YR. Results of the monitoring and forecasts are presented as tables and maps in the Internet. ...
The paper presents the analysis of the impact of predicted climate change on water demand of late potato in 2021-2050 and 2071-2100. Meteorological data were simulated with the regional model RM5.1 with boundary conditions from the global model ARPEGE for the scenario SRES: A1B. Reference period was 1971-2000.The measure of crop water demand is potential evapotranspiration. It was calculated using the Penman-Monteith method and crop factors. The impact of climate change on potential evapotranspiration of late potato was evaluated in Poland at the five meteorological stations representative for agroclimatic regions: Olsztyn, Bydgoszcz, Warszawa, Wrocław, Kraków. Water demand of late potato will increase of up to 7% in 2021-2050 and of up to 18% in 2071-2100. Increase will be the biggest in the south-west and central-east regions and the smallest in south-east region. Predicted climate change and increased crop water demand should result in increase of irrigated area and irrigation water requirements. ...
