The effect of complex fertilizers on the productivity of potato varieties on reclaimed lands in the Central Agricultural District of the Russian Federation

Abstract

On a reclaimed site in the conditions of the Central NonChernozem region of Russia (Tver region), the productivity of potato varieties Sadon and Gala was studied on two backgrounds of mineral nutrition (N120P160K180 and N120P160K180 + trace elements) with different variants of non-root top dressing (control (without top dressing), Aquarin 12 (2x top dressing), Humate +7 (2x top dressing); Aquarin 12 (1st top dressing) + Humate +7 (2nd top dressing)). As a result, it was revealed that the highest yield and crop quality were obtained from the Sadon variety, which in 2023 formed 32.8 thousand plants/ha, 40.7 t/ha of tubers with a dry matter content of 20.4%. The microelement additive provided a significant increase in yield (1.9 t/ha) only for this variety. Against the background without a trace element additive, the highest tuberous productivity in the Sadon variety was provided by 2-fold use of the preparation Humate+7 (an increase of 6.4 t/ha), in the Gala variety – Aquarin 12 + Humate+7 (an increase of 6.7 t/ha). Against the background of the microelement additive for the Sadon variety, the increase in yield was ensured by the use of all foliar dressings (3.9 - 4.6 t/ha). A strong direct relationship was found between the yield of tubers and the density of plants standing for harvesting and the chlorophyll content index (CCI) (correlation coefficient r = 0.76 – 0.80).