Научный журнал

The stationary of the Department of Agrochemistry and Plant Physiology of the Stavropol State Agrarian University is 45 years old this year. During this period, a lot of fundamental scientific materials were obtained on the system of experiments on leached chernozem, as well as various methodological approaches to the assessment of agrocenoses of the Stavropol upland were studied. An important element of the modern concept of the functioning of a longterm experimental hospital is modeling and forecasting. This article summarizes the results of four crop rotation rotations. In 2021, the fifth rotation of the eightfield stationary crop rotation will be completed, so the data will be given for four rotations, taking into account the aftereffect (38 years). On leached chernozem, longterm use of fertilizer systems contributes to accelerated mineralization and greater consumption of humus. Against the background of the availability of 115-167 kg/ha of mineral and 5-8 t/ha of organic fertilizers, there is a stabilization of the availability of humus. The use of the calculated fertilizer system with a mineral saturation of 167 kg/ha and organic 5.0 t/ha allows to accumulate a high level of mobile phosphorus - 31.9 mg/kg, which is higher than the initial values by 7.9 mg/kg. The calculated fertilizer system (with a saturation of 180 kg/ha of active ingredient + 7.5 t/ha (1978-1993) and 167 kg/ha of active ingredient + 5.0 t/ha (2000-2015)) significantly increased the content of mobile potassium compared to the initial value and the natural agrochemical background. The recommended and calculated fertilizer systems contribute to a significant reduction in the pH response by 0.6 and 0.7 units, respectively. The use of a biologized (with a saturation of 120 kg/ha active ingredient + 5.0 t/ha (1978-1993) and 62.5 kg/ha d. v. + 8.2 t/ha (2000- 2015)) fertilizer system contributes to the preservation of pH indicators at the level of the natural agrochemical background - 6.53 units.