Modelling Salvia sclarea L. yields depending on plants spacing, mineral fertilisers and depth of ploughing in the irrigated conditions of cold Steppe zone

Ukraine has favourable natural conditions for the cultivation of medicinal and aromatic plants, but there is a lack scientific knowledge practical guidelines their cultivation. Clary sage valuable prospective crop South deserves special attention. This study aimed to investigate theoretical mechanisms clary productivity formation on irrigated lands Southern Ukraine. The experimental basis data inflorescence yields, collected during field investigation technology in dripirrigated Kherson Oblast 2013-2018. Theoretical yield depending elements was performed through rank correlation heteroscedasticity analyses, while mathematical model prediction developed using multiple regression. As result, null hypothesis about influence factors studied yields denied according Breusch-Pagan Glejser tests, although results analysis variances revealed no significant effect depth plough spacing yields. Rank that highest attributed phosphorus fertilisers. In addition, information each agrotechnological factor determined, namely: 1 kg nitrogen fertilisers applied per ha reduces by 6.34 kg; increases 156.44 extra cm row 3.33 deeper ploughing improves 56.56 kg. moderate fitting quality (correlation coefficient 0.5885) reasonably good accuracy (mean absolute percentage error 24.12%). analogues or world provides novel insights cold Steppe zone