Növénytermelés / Volume 60 / Issue 2 (June 2011) / pp. 83-96

Kátai Z

The effect of regulator use on the yield and certain agronomical characteristics of winter coleseed (Brassica napus L.)

The yield obtained in the regulator rape experiment showed that regulator treatments were successful in every applied plant density of both the hybrid (Vectra) and the variety (Smart). Although yield differences were not too significant in the case of different regulator treatments, it can still be clearly established that combined autumn and spring regulator treatments (C and D treatment) were more successful than only autumn treatments. It can be stated that both the variety (Smart) and the hybrid (Vectra) reacted to regulators similarly from the aspect of yield increase. In the case of a lower germ number (0.5-0.7 million per hectare), both the hybrid and the variety showed a more expressed yield increase (35.0-37.5%) than in the case of higher germ number (0.8-1.0 million per hectare), when this value was between 20.0-20.8%. The highest yield was obtained in the case of the Smart variety, 0.7 million per ha germ number, combined autumn and spring regulator treatment (2 878 kg ha-1).

The results of the plant pathological and infection dynamical examinations showed that the number and occurrence of pathogens in rape are continuously increasing. Based on the results of the regulator rape experiment, it can be stated that Peronospora infection was the strongest in rape (Smart variety, control plot, 1.0 million germs per ha: 27%), but the levels of Phoma and Sclerotinia infection were also relatively strong. In the regulator rape experiment, the level of infection was reduced by the applied regulators (that were also fungicides). No significant difference could be observed between the disease resistance of the hybrid (Vectra) and the variety (Smart). The level of infection was somewhat more moderate in the case of lower plant density.

Keywords: oilseed rape, regulator, yield, Peronospora, Sclerotinia, Phoma, variety, hybrid, plant density, lodging

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