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CHARACTERIZATION OF AGRICULTURAL DROUGHTS USING STANDARDIZED PRECIPITATION INDEX (SPI) AND BHALME-MOOLEY DROUGHT INDEX (BDMI)
Autori: Nicu Cornel Sabău
Data aparitiei: Iunie / 2015
Revista: Environmental Engineering and Management JournalVol. 14Nr. 6
ISSN: 1843 - 3707
Pret: 25.00 RON    
N.A.

Abstract
In order to verify the possibility of agricultural drought forecasting and prediction of agricultural yields in a given region, two
climatic indices were used to monitor drought: Standardized Precipitation Index (SPI) and Bhalme - Mooley Drought Index
(BMDI). For the case study were taken into account conditions in Oradea, from Crişurilor Plain, which is located in the Western
Romania. Evolution of dry periods determined by the two indices is similar but there are differences in their length and
frequency, BMDI indicating higher frequencies of dry periods than SPI. In the majority of time periods analyzed, the future
evolution trend indicated by the two climate indices is toward positive values, which means an increasing trend in the frequency
of wet periods. Findings on the risk to drought using the drought magnitude calculated for monthly periods of different lengths
and their frequencies indicate that the risk of drought according to SPI is reduced, while for BMDI it is indicated a medium risk
of occurrence of droughts, appreciation closer to those shown in similar studies conducted in this area. The second-degree
polynomial correlations established between the yields of winter wheat and maize, respectively BMDI and SPI values calculated
for different time periods (hydrological year, cold season, warm season and vegetation period) demonstrate the possibility of
predicting the crop yields, their accuracy being greater for smaller calculation periods, as close as possible to vegetation period of
the analyzed culture. The results obtained for the case study performed confirm the above.



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