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The paper presents results of studies on energy efficiency of production of some Brassica oilseed crops: winter and spring oilseed rape (Brassica napus L.), white mustard (Sinabis alba L.), Indian mustard (Brassica juncea L.), spring false flax (Camelina sativa L.) and crambe (Crambe abyssinica Hochst.), which in the international commercial trade are referred to as oilseed rape. In the agronomic and ecological conditions of Poland, 1 ha of winter oilseed rape can generate over 166 GJ energy, including about 45 GJ of energy utilisable for production of methyl (ethyl) esters. Having subtracted the crop production input (about 21 GJˇha-1), the cumulated energy gain from 1 ha winter oilseed rape is energy equivalent to nearly 3.5 t of diesel oil or 8.5 t of firewood. The energy potential of spring oilseed crops seeds and straw is relatively lower: 31-39% less for spring oilseed rape and white mustard, 51-53% less for false flax and Indian.
The objective of these studies was to compare the productivity and nutritive value of fruits of five foreign genotypes of crambe (Crambe abyssinica), grown in Poland. Of the five genotypes compared, highest yields of fruits, protein and fat were given by the variety Prophet and the cultivar BGRC 34311. Erucic acid content of seed oil was in the range of 58.91-62.02%, depending on genotype. The content of glucosinolates, isothiocyanates and goitrin, in fruits of crambe varieties and cultivars (0.09-0.13 and 0.505-0.520, respectively) was highly variable.
The research was conduced in the years 1999-2000. The aim of the research was to determine the health condition of overground parts and seeds of the following spring oilseed crops: crambe (Crambe abbysinica Hoechsl.) cv. B o r o w s k i, false flax (Camelina sativa L.) cv. B o r o w s k a, spring rape (Brassica napus ssp. oleifera L.) cv. M a r g o and oleiferous radish (Raphanus •tivus var. oleiferus L.) cv. P e g 1 e t t a. In all the years of the research alternaria, light was found on the leaves and siliques of spring rape and oleiferous radish and on the leaves and stems of crambe. False flax proved to be weakly infected by •pathogens. On its leaves gray mould (Botrytis cinerea) was found in all the years, of the research. The disease was found on the siliques only in 1999. In 2000, powdery mildew was found on spring rape and false flax (respectively, Erysiphe cifearum and E. cichoracearum). The weather conditions affected the intensity the diseases on the studied spring oilseed crops. Alernaria genus, especially A. alternata was most commonly isolated from the of examined p!ants. It constituted from 37% (in crambe) to 63.3% (in spring) of all the isolates. Of the remaining pathogenic species, numerous fungi of Fusarium genus (F. avenaceum, F. culmorum, F. equiseti and F. oxysporum) isolated. They constituted from 1.0% (false flax) to 17.3% (crambe) of the isolates.
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