Agroecological bases of optimization of formation of agrophytocenoses of agricultural crops in the Central Forest-Steppe of Ukraine

Abstract

Purpose. Identify the features of growth and development of crops in ontogenesis depending on the weather conditions of the growing season and fertilizer rates and establish certain theoretical relationships.
 Methods. Laboratoryfield, statistical.
 Results. A comprehensive system of observations and assessment of crops was carried out during 2008–2017 in crop rotation in farms of Tetiiv district of Kyiv region and in SE Shevchenkivske of IBCSB NAAS of Ukraine. Crop rotation productivity is a function of the complex interaction of weather (HTC) and agrotechnical (fertilizer) factors. It is established that the potential productivity of crop rotations by 8–47% depends on the weather conditions of the growing season. The most favorable weather conditions (HTC) were in 2008 (1.1), 2010 (1.2), 2012 (1.2), and 2014 (1.8). The results of the research also showed a close relationship between crop yield and fertilizer factor. On average, over the years of research, the maximum yield of the main products was obtained with the combined use of mineral and organic fertilizers: sugar beet 40.91–43.21 t/ha, fodder beet 69.3–69.5 t/ha, corn for grain 5, 906.03 t/ha, corn for silage, 60.0 62.3 t/ha.
 Conclusions. To create highly productive agrophytocenoses of agricultural crops, it is necessary to reach the parameters of optimal density, which contributes to the maximum biological productivity of plants in the system ‘hydrothermal conditions–plants–components of technology’.