Production of some rapeseed cultivars under different climatic conditions in Slovakia
2011
Masarovičová, E. | Kráľová, K. | Malovcová, Ľ.
Production of six Brassica napus var. napus; syn: Brassica napus ssp. oleifera cultivars was studied in relationship to various climatic conditions. The production parameter estimated was seed production, while oil content, oil production and the substantial content of seed fatty acids were the qualitative parameters determined. Air temperature and atmospheric precipitation were considered to be the most important climatic factors in rapeseed production. The mean monthly values for these factors in 2007/2008 were compared with values established over the longer-term period of 1961 to 1990. It can be concluded from this data that the course of the weather was generally favourable for all important growth stages comprising ontogenetic development. These consisted of sowing, flowering and seed maturation. Rapeseed was sown in August 2007, when recorded air temperature and precipitation were both above normal. September and December experienced colder than usual temperatures plus above-normal precipitation, while the January and February winter months were abnormally warm with somewhat limited precipitation. The spring months before harvest experienced 1.5 to 2.5 °C above the average monthly temperature, while precipitation ranged from 75 to 164% of normal values. A high seed production was estimated for Oponent, Atlantic and ES Astrid cultivars, with Oponent having both high oil content and production. The content of the most important fatty acid, oleic acid, ranged from 60.02% in Labrador to 65.80% in Atlantic. Oponent also had a higher content of oleic acid with 62.12%. Seeds of all studied cultivars had a low content of linolenic acid at 8.33−9.59%, while erucic acid ranged from
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