BULK DENSITY OF BLACK SOIL WHEN USING MINERAL AND HUMIC FERTILIZERS

Abstract

The use of growth-stimulating preparations is an important factor in the biologization of agriculture, which stimulates the active development of the root system, uniform growth of crops, enhancing their ability to absorb nutrients and moisture from the soil.
The application of humic fertilizers to the soil helps to optimize soil properties, including agrophysical ones. The study of the effect of humic fertilizers on the soil bulk density is of particular relevance, since the formation and maintenance of this parameter at the level of optimal values is the most important condition for obtaining stable yields of crops. In order to evaluate the effect of mineral and humic fertilizers on the bulk density of black soil in grain crops of the grain-fallow crop rotation in 2020-2022, a field experiment was conducted at the instructional farm “Minderlinskoe” of the Krasnoyarsk State Agrarian University. Spring wheat and spring barley were cultivated in the grain-fallow crop rotation: seeded fallow – wheat – wheat – barley under conditions of complex chemical plant protection. The field experiment scheme included 6 variants with the use of complex fertilizer ammophos in two dos-
es, foliar treatment of grain crops with Lignohumate and its combined use with mineral fertilizers. The control variant was where the crops were cultivated without fertilizers. It was shown that the treatment of grain crops with humic fertilizer Lignohumate AM in tank mixtures smoothed down the seasonal dynamics of bulk density (Cv = 2-15%) in black soil. Separate and combined application of mineral and humic fertilizers in wheat and barley cultivation technology determined an increase in the bulk density of black soil in the 0-20 cm layer by 0,01-0,07 g/cm3, 20-40 cm - by 0,02-0,04 g/cm3. The maximum bulk density of the arable
layer of black soil in the wheat – wheat – barley crop rotation link was formed when applying Lignohumate AM on vegetative plants on the background of pre-sowing application of ammophos at a dose of N12P50 (0,96 g/cm3).