Keywords:
- meadow soils
- humus content and reserves
- gross and mobile forms nutrients nitrogen
- phosphorus
Abstract
There are presented data on the content and reserves of humus, gross and mobile forms of nitrogen, phosphorus and potassium in old-irrigated meadow alluvial soils of six districts of the Bukhara region of the Republic of Uzbekistan; an assessment of their current state in terms of provision with mineral nutrition elements is given. The content of humus in the arable layer in all areas is equal to 0,62–0,97 % and decreases along the soil profile to 0,20–0,53 % at a depth of more than 1.5 m. The gross amount of nitrogen in the arable layer is 0.049–0.088 %, phosphorus 0,21– 0,35 %, potassium 0,82–2,80 %. According to the content of nitrate nitrogen in the arable layer, there are significant differences between the districts of the region: in the northern 1,7–5,5 mg/kg of soil, in the southern 46,8–57,7 mg/kg. The content of mobile forms of phosphorus in the arable layer of all soils is 10,8–23,5 mg/kg of soil, potassium 108–150 mg/kg.
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