Spatial Variability of Soil Fertility Parameters in the Area of Monitoring Network for Study of Saline Soils Kermen,Bulgaria | Пространствено вариране на параметрите на почвеното плодородие на мониторинговата мрежа за изследване на Засолени почви Кермен
2013
Kutev, V., N. Pushkarov Institute of Soil Science, Sofia (Bulgaria) | Andreeva, N., N. Pushkarov Institute of Soil Science, Sofia (Bulgaria)
Saline soils in Bulgaria occupy an area of over 36 000 ha, or more than 0.6% of the arable land and over 2.5 percent of the irrigated areas. Potentially saline soils are much higher. Despite the small percentage they represent a problem for our agriculture. Growing importance of the fact that their distribution is in the form of spots among fertile soils subject of intensive farming and more important areas are affected. Salinity areas are with to improper drainage and irrigation. There is a need to update the knowledge about the distribution and evolution of soil formation processes in saline soils in the locality of Kermen. Objectives: Determination of the spatial variation of agrochemical parameters of soil fertility – nutrients, organic matter. Based on the used soil-climatic information in the town of Kermen a soil monitoring network was established. Currently, the network consists of 30 points. Statistics treatment of data showed that higher coefficient of variation has phosphorus – 170% and inorganic nitrogen – 40%. For other studied parameters it was less than 20%. Strong correlation of spatial variability was observed between relief and a parameter related to salinity – soil reaction. Studied soils have a neutral to slightly alkaline. The humus content in the soil is dependent on soil type, the air-water conditions in the soil and the soil reaction as a result of them. NPK are more dependent on soil type and soil formation processes and prevailing parent rock. In the 30 soil samples from Kermen values obtained for pH in H2O ranged from 4.8 to 9.3. Prevalence is between 7.0 and 8.0, i.e. most of soils samples have a neutral to slightly alkaline. The remaining parameters are connected with hydrological processes and influenced by these biological processes.
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