Parametric model of sustainable fertility of gray forest light-loamy soil

Abstract

Goal. To substantiate the integrated factual model of sustainable potential and effective fertility of gray forest coarse-grained sandy loam soil in grain-rotation crop rotations typical for the Northern part of the Forest-Steppe. Methods. Generalization, analysis, and synthesis, analog, field, laboratory, statistical, computational. Results. The globalization of the problem of soil fertility is due to the catastrophic devastation of arable land (6 million ha/ year). Ukraine loses up to 20% of GDP every year due to soil degradation. Perception of the category «fertility» as a biosphere phenomenon of large-scale recirculation of substances and energy eliminates the contradictions of its interpretation and validation by specialists. The generalization of long-term developments of the author and constructive decisions of modern agronomy made it possible to establish digital optimums of soil fertility indicators and their ranking into functional blocks. The quintessence of long-term stationary field and verbal researches is the actualization of the developed 15-blocks information-prognostic model of the fertility of gray forest sand loamy soil with average productivity of 7-fields grain-rotation crop rotation in the IV rotation (1997–2004) over 10 t/ha. Conclusions. Complex cultivation of gray forest soil during 1969–2004 had provided an increase in the yield from 1 ha of arable land from 5.02–5.18 to 9.63–10.46 t/ha g.un., or 1.9–2.1 times with a significant advantage (4.3–8.6%) of agrotechnologies based on different depth (6–45 cm) shelf-free tillage (1+5), in particular deep chisel under row crops. Optimization of only physical, agrochemical, phytosanitary and technological units contributes to the successful verification of the fertility model of the experimental ecotope and motivates its further application and improvement.