Abstract
The article presents the results on the effect of various soil treatments and doses of mineral fertilizers on the productivity of spring barley under irrigation conditions on light chestnut soils of the Northern Caspian. Studies have revealed that the greatest yield increases were obtained when using the working organ of the ROPA – 0,32–0,49 t / ha, as well as when applying mineral fertilizers at a dose of N150P150K150 – 3,91–4,08 t /ha. In absolute
 terms, the highest yield of barley grain was provided on the variant with deep loosening of the soil with a ROP tool (h = 0,4–0,45 m) with a dose of fertilizers N150P150K150 – 7,64 t/ha.
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