Effectiveness of non-traditional lime ameliorants on the formation of productivity and quality of potatoes, soil fertility and environmental safety

The use of conversion calcium carbonate (CCC) with the same effect as limestone flour according to GOST R 50261-92 can reduce the cost of liming by an average of 40%. CCC is characterized by high neutralizing capacity (90-95% in terms of CaCO3), contains nitrogen (0.3-0.5%) and phosphorus (0.5-0.6%). Undesirable impurities in SSC include stable, non-radioactive strontium (up to 1.7%) and fluorine (0.3%). The results of the effect of conversion calcium carbonate under the intensive use of arable land in potato crop rotation are presented. The effect of non-traditional ameliorant on changes in the fertility of acidic sod-podzolic sandy loam soil has been revealed. The results of research in a field experiment with two varieties of potatoes: Snow White and Red Scarlett, in the conditions of the Moscow region showed that CCC is a highly effective fast-acting lime fertilizer, in terms of its effect on agrochemical indicators of soils, it is one of the best forms of chemical ameliorant. Products grown on two varieties of sod-podzolic soil (sandy loam/medium loamy) using an average dose of mineral fertilizers (N90P90K90) on acidic soil and produced by calcium carbonate conversion in increasing doses: 3-6 and 4-9 t/ha, according to the Ca/Sr ratio (184-453 and 170-369), as an indicator of quality, were above the threshold value (140). The dynamics of acid-base properties of soils showed that the losses of exchangeable bases in the arable layer for the period 2019-2023 amounted to: CaO – 1.7-4.9 mg/100 g and MgO – 0.9-1.8 mg/100 g of soil, or in terms of per hectare: CaO – 51-147 kg and MgO – 27-54 kg. In connection with this, root feeding with magnesium-containing fertilizer (AgroMag, 60% MgO) in doses of Mg100-200 provided an increase in the yield of the early potato variety of 2.6-4.5 t/ha or 13.6-23.6% to the mineral background, and the content of exchangeable magnesium in the arable soil layer increased by 2.8-3.4 mg/100 g of soil.