EVALUATION OF THE SPRING RAPESEED HYBRID ‘CULTUS CL’ BY YIELD-RELATED TRAITS UNDER THE EFFECT OF A PLANT GROWTH REGULATOR
Abstract
Purpose. To determine the effect of different rates of a plant growth regulator on the formation of growth, development, yield, and productivity traits of spring rapeseed plants of the hybrid ‘Cultus CL’ in order to assess the potential for realization of its genetic potential.
Methods. The object of the study was the spring rapeseed hybrid ‘Cultus CL’ (NPZ Lembke), evaluated for its response to the application of the plant growth regulator Tilmore 240 EC at rates of 0.75 and 1.2 L/ha. The experiment was established according to a classical field trial design with four replications; the total plot area was 50.4 m², and the accounting area was 36 m². The treatments were arranged sequentially within replications organized into two strips.Crop treatment was carried out by spraying using an агрегate (MTZ-82.1 tractor and “STEP-2500” sprayer) with a working solution rate of 200 L/ha. Harvesting was performed at full maturity by direct combining (Don-1500B combine harvester equipped with a 6 m rapeseed header).
Results. The application of the plant growth regulator Tilmore 240 EC induced a positive dose-dependent response of the spring rapeseed hybrid Cultus CL, manifested in intensified growth processes and improved biometric parameters of plants. The maximum plant height at the flowering stage (135.3 cm) was recorded at the rate of 1.2 L/ha, exceeding the control. The use of the regulator improved yield structure elements, particularly increasing the number of pods per plant, seeds per pod, and thousand seed weight, which resulted in higher yield: at 0.75 L/ha the increase was 0.56 t/ha, while at 1.2 L/ha the maximum yield reached 3.70 t/ha, significantly exceeding the control. Along with increased productivity, improvements in seed quality were observed: at 1.2 L/ha, crude fat content increased to 45.9% (compared to 44.1% in the control), and crude protein content increased to 25.6% (compared to 25.2% in the control).
Conclusions. It was established that the application of the plant growth regulator Tilmore 240 EC at 1.2 L/ha ensures intensification of growth processes, increases spring rapeseed yield up to 3.70 t/ha (yield gain of 0.76 t/ha), and improves seed quality (increase in crude fat content by 1.8% and protein by 0.4%). The obtained results confirm the effectiveness of the regulator as a factor in realizing the genetic potential of the hybrid and can be used as selection criteria for breeding high-yielding genotypes.
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