Abstract
The article presents the results of three-year (2015-2017) studies research on the influence of nitrogen nutrition conditions on the productivity and quality of potatoes variety Tamasha. The studies were carried out on dark brown heavy loamy carbonate soils of Central Kazakhstan with a humus content of 2.73-2.79 %, total nitrogen - 0.147-0.172 %, total phosphorus - 0.20-0.25 %, with a high level of availability of mobile phosphorus and potassium, low content of nitrate nitrogen, slightly alkaline reaction of soil solution. Studies have shown a high responsiveness of potatoes to nitrogen fertilizers. According to the results of the research, a high correlation between potato productivity and the nitrate nitrogen content in the soil (R=0.85-0.96) was revealed, the optimal level of nitrate nitrogen in the 0-40 cm soil layer was determined for Tamasha potatoes - 17-19 mg/kg. The increased nitrogen content of nitrates in the soil slightly reduced the starchiness of potatoes.