Evaluation of soil salinity level through using Landsat-8 OLI in Central Fergana valley, Uzbekistan

Abstract

Soil salinity is a major concern in the Uzbekistan. Fergana valleys agricultural lands, it negatively affects plant growth, crop yields, whereas in central part of the valley is semi-desert and desert affects agricultural areas due to subsidence, corrosion and ground water quality, leading to further soil erosion and land degradation. Traditional soil salinity assessments have been doing by collecting of soil samples and laboratory analyzing of collected samples for determining totally dissolved soils (TDS) and electro conductivity, but, Geo-informatic systems (GIS) and Remote Sensing (RS) technologies provides more efficient, economic and rapid tools and techniques for soil salinity assessment and soil salinity mapping. Main goals of this research are to map soil salinity of Fergana valley, to show relation of its result with traditional analysing and analysing withGIS technology As a source of satellite images has been used Landsat-8 OLI. Research areas every arable land validity point of different locations were measured by Traditional soil salinity assessments by Soil composition and Repository, Quality analysis center was compared to our research conducted on satellite sensor and it can be said that the study have done correctly.

Improving the methods of determining the amount of non-agricultural land use in agriculturae in Uzbekistan

“…In 2019, 541 economic entities identified cases of land irregularities on an area of 2.1 thousand hectares, and 458 land-user entities identified appropriate measures. Here 71 cases of anonymity or misrepresentation of information from the report by users of land 23 percent, 184 cases of withdrawal from the projects of Economic Internal land formation by users of land 56 percent, 135 cases of non-economic or inefficient use of land by users of land 14 percent, 151 cases of violation of the law by users of land [22][23][24][25]. According to the analysis carried out, in the use of agricultural land in land violations, it is possible to observe the use of it for other purposes than its intended purpose, including the placement of crops other than the specified type of crop, as well as the cases of deviations from the terms of the contract.…”

Evaluation of seven spring waters in Jizzakh region based on general chemical analysis (Gallaaral, Jizzakh, Uzbekistan)

“…The chemical properties of spring waters, for example, the amount and quality of heavy metals, depend on the state and amount of mineral substances in the ground layers of the underground water where the spring is located, as well as the pressure force. The presence or absence of large mechanical particles in the water is also related to whether or not protection measures have been established for the source of the spring [4]. The quantity and quality of organic products (substances containing carbon) are closely related to the location of the source, the influence of human factors, whether the surface is closed or open, and the geological condition of the underground layers [5].…”

Cultivation of plants based on new technologies in the dry soil of the Aral Sea

“…However, there are enough ecological problems waiting to be solved in the territory of the island, which requires continuous scientific-based practical work on their solution. The drying up of the Aral Sea was caused by global climate change and the irregular use of water resources since 1960, the poor functioning of drainage collectors and the expansion of irrigated farming activities in the region, resulting in a decrease in the water level and an increase in salt content [3][4][5][6][7][8][9][10][11], as well as the process of transition from hydromorphic to automorphic process accelerated, desertification became active. As a result of the drying up of the Aral Sea, the process of soil formation began in the open sand dunes.…”