SEED YIELD FORMATION OF THE COCKSFOOT VARIETIES UNDER THE IMPACT OF OPTIMIZED FERTILIZING SYSTEM

Abstract.

The article considers the results of field and laboratory researches concerning the cocksfoot (Dactуlis glomerata L.) seed yield formation of Vasylynka, Oleshka 14, Inhulka 17 varieties under the impact of optimized fertilizing system with the application of liquid complex fertilizers Quantum-Grain (LCF) and concentrated boric fertilizer Quantum Bor-Active (B). It has been proved that the application of mineral fertilizers N60Р60К60 in combination with LCF Quantum-Grain+Bor-Active provides the optimum conditions for the cocksfoot seed yield formation indices (0,56–0,66 t/ha) in Ukrainian Polissya area. Variants with Vasylynka variety demonstrate the highest indices (0,66 t/ha) and exceed yield indices of Oleshka 14 variety on average by 15 %. The application of liquid complex fertilizers as top-dressing increases cocksfoot seed yield on average by 19 % in all the varieties as compared to solely N60Р60К60 application. Variants with the application of mineral fertilizers and variants with top-dressing provide the longest inflorescences: in Vasylynka variety 18,8-18,4 cm, in Oleshka 14 variety – 307–282 cm, in Inhulka 17 variety – 310–280 cm. The seed quantity in an inflorescence ranges from 250 to 314 depending on variety and fertilization. Vasylynka variety has the highest seed quantity which ranges from 252 to 314. The weight of 1000 seeds in experimental variants ranges from 1,0 to 1,2 gm and depends mainly on fertilization. Vasylynka variety in case of mineral and liquid complex fertilizers application has the maximum quantity of reproductive shoots (136 per square meter). The prospects for further research include the investigation of the impact of liquid complex fertilizers on the cocksfoot seed yield and quality.

Keywords: cocksfoot, seed yield, biometric characteristics of reproductive organs, liquid complex fertilizers, varieties

10.33249/2663-2144-2020-90-5-36-40