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- W2183558353 abstract "The impact of droughts on agricultural crops depends mainly on net precipitation distribution during the vegetation period and soil physical properties. Most of drought indices do not reflect the complicate interaction between current climate conditions, soil properties and crop water demands. This study compares the identification of summer drought by some wide-spread drought indices (seasonal net precipitation, SPI, PDSI and simplified water balance) with net irrigation requirements and irrigation scheduling for maize. The case study is conducted using long-term records of climate data for Sofia region and simulation of irrigation scheduling of maize grown on soils with contrastive properties: low water permeable Vertisol of high water holding capacity (180 mm m -1 ) and medium permeable Chromic Luvisol of 140 and 106 mm m -1 total available water. The irrigation schedule was performed using CROPWAT program (Smith, 1992). For this study the alternative with constant application depth of 60 mm that partially refills the soil reservoir was adopted. The percent of years of high irrigation demands when more than two irrigation events are required is 26%, 13% and 42%, respectively for soils with medium, high and low water holding capacity. The statistical analyses relative to the studied period indicate some deviations of the estimates given by climate indices and those of the net irrigation requirements. Taking into account the practical use of the results it is recommended to use probability of exceedance of net irrigation requirements and demands as an additional indicator for summer drought and as a basis for assessment of the other indices." @default.
- W2183558353 created "2016-06-24" @default.
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- W2183558353 date "2010-01-01" @default.
- W2183558353 modified "2023-09-27" @default.
- W2183558353 title "Use of Irrigation Requirements and Scheduling as Drought Indicator" @default.
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