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<b>Abstract</b>— <p>The effect of increasing doses of nitrogen fertilizers N30–120 against the background of P60K60 on the content of total nitrogen, phosphorus, and their various forms in the layer of 0–60 cm of a heavy loamy soddy-podzolic soil [Albic Retisol (Abruptic, Aric, Loamic)] at the end of the sixth rotation of the eight-field crop rotation was assessed. The experiment was laid out in the Perm krai in 1972. The minimum content of total nitrogen was observed in the experiment in the topsoil (0–20 cm) layer of the P60K60 treatment; the reserves of decreased significantly (by 7%) relative to the control. The application of nitrogen fertilizers contributed to the maintenance of total nitrogen at the level of the control. The reserves of mineral nitrogen increased in the N90-120P60K60 treatments in the 0–60 cm soil layer by 1.5–1.7 times. The total phosphorus content in the topsoil layer was 1.3 times higher than in the control, when nitrogen fertilizers were applied at the rates of N60–120 against the P60K60 background. The total phosphorus reserves in these treatments approached those in the virgin soil. The use of nitrogen fertilizers contributed to the preservation of organic phosphorus, while the use of phosphorus fertilizers increased the content of mineral phosphorus, which positively affected the total amount of the element. The use of nitrogen fertilizers affected phosphorus availability; an increase in the amount of available phosphorus was observed in the layers of 20–40 and 40–60 cm. Long-term crop cultivation without fertilizers led to a decrease (relative to the virgin soil analogue) in the total nitrogen and phosphorus reserves in soil by 15–23% in the layer of 0–20 cm and by 9–10% in the layer of 0–40 cm.</p>

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Changes in the Nitrogen and Phosphate Regimes of Soddy-Podzolic Soil as a Result of Long-term Use of Increasing Doses of Nitrogen Fertilizers in the Cis-Urals

  • 期刊论文

  • 发表日期：

    2026年6月22日

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  • M. T. Vasbieva

摘要

Abstract—

The effect of increasing doses of nitrogen fertilizers N30–120 against the background of P60K60 on the content of total nitrogen, phosphorus, and their various forms in the layer of 0–60 cm of a heavy loamy soddy-podzolic soil [Albic Retisol (Abruptic, Aric, Loamic)] at the end of the sixth rotation of the eight-field crop rotation was assessed. The experiment was laid out in the Perm krai in 1972. The minimum content of total nitrogen was observed in the experiment in the topsoil (0–20 cm) layer of the P60K60 treatment; the reserves of decreased significantly (by 7%) relative to the control. The application of nitrogen fertilizers contributed to the maintenance of total nitrogen at the level of the control. The reserves of mineral nitrogen increased in the N90-120P60K60 treatments in the 0–60 cm soil layer by 1.5–1.7 times. The total phosphorus content in the topsoil layer was 1.3 times higher than in the control, when nitrogen fertilizers were applied at the rates of N60–120 against the P60K60 background. The total phosphorus reserves in these treatments approached those in the virgin soil. The use of nitrogen fertilizers contributed to the preservation of organic phosphorus, while the use of phosphorus fertilizers increased the content of mineral phosphorus, which positively affected the total amount of the element. The use of nitrogen fertilizers affected phosphorus availability; an increase in the amount of available phosphorus was observed in the layers of 20–40 and 40–60 cm. Long-term crop cultivation without fertilizers led to a decrease (relative to the virgin soil analogue) in the total nitrogen and phosphorus reserves in soil by 15–23% in the layer of 0–20 cm and by 9–10% in the layer of 0–40 cm.