Rainfalls Sharе in the Available Water Content under Winter Wheat in Some Soils of Northern Bulgaria | Усвояемост на валежите при два почвени типа в Северна България
2010
Georgieva, V., National Institute of Meteorology and Hydrology, Sofia (Bulgaria) | Kazandzhiev, V., National Institute of Meteorology and Hydrology, Sofia (Bulgaria) | Moteva, M., Institute of Melioration and Mechanization, Sofia (Bulgaria)
The rainfalls share the main part of the available water content in Bulgarian soils. A preliminary estimation of rainfall absorption is necessary for correct planning of the water amounts for irrigation application. The paper deals with the dynamics of the available water content and the effective rainfalls in two soil types of Northern Bulgaria - haplic chernozems and orhtic luvisols throughout a yearly farming cycle of winter wheat. The study target is the root zone and the integrated soil layers top 50 cm, top 100 cm, and 100-200 cm. The rainfall data processed comprise the period from October 1st of the previous year to September 30th next year in the five-year cycle 1997-2002. They are collected from the representative for haplic chernozems and orthic luvisols agrometeoroligical stations Kneja and Nicolaevo in Northern Bulgaria. The soil multi-layer effective rainfall under winter wheat is evaluated by Harchenko equation from the Russian simulation model Weather-Yield adapted to the Bulgarian soil-climatic conditions and is graphically presented. Coefficients of rainfall absorption the effective rainfall for the autumn-winter, spring-simmer periods and yearly are calculated.
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