The influence of magnesium containing fertilizers on potato productivity

In the field experiment (2020-2021) on the Zhukovsky Early potato variety, it was found that the pre-planting application of AgroMag granulated fertilizer (60-62% MgO) in doses of 100 and 200 kg/ha a.i., as well as magnesium sulfate (magnesium control) at a dose of 100 kg/ha a.i. gave a significant increase in potato yields, on average for two years – 5.0 t/ha (17.9%), 9.6 t/ha (34.4%) and 5.3 t/ha (19%), respectively, to N116P116K152-control; improved the fractional composition of tubers and the quality of products. The effect of the new magnesium-containing fertilizer AgroMag granulated at a dose of Mg100 was at the level of the magnesium standard MgSO4 in the same dose. The contribution of the main application of AgroMag granulated in two doses (100 and 200 kg/ha a.i.) to the formation of potato yields at the level of 44-51 t/ha in a normal wet year (2020) was 20-40%, and when forming 22-26 t/ha in a dry year (2021) – 14-24%. Foliar spraying twice a season (budding-flowering) with the liquid agrochemical AgroMag ActiMax (3 l/ha) against the background of N116P116K152 provided significant increases both in 2020 – 5.1 tons (13.9%) and in 2021 – 1.9 tons (9.9%). The most significant yield increases were obtained in variants with the combined use of AgroMag granulated in the soil at doses of 100 and 200 kg/ha a.i. and liquid agrochemical AgroMag AktiMax on a leaf, 3 or 6 l/ha x 2 times: 10.0 t/ha (35.7%) and 13.5 t/ha (48.2%) relative to N116P116K152-control. Mg-fertilizers in increased doses (200 kg/ha and 6 l/ha) increased the marketability of the crop by 2.2-2.6%, starch content by 0.9-1.5% and the taste of boiled tubers (by 1 point), the collection of nutritionally valuable nutrients by 40-55%, the yield of the seed fraction of tubers per hectare by 27-29%, and also reduced the metabolic and hydrolytic acidity of the soil, increased the amount and degree of saturation with bases due to a significant increase in exchangeable magnesium by 66-72 mg/kg relative to the values of the arable layer N116P116K152 control.