Topic
Rapeseed
About: Rapeseed is a research topic. Over the lifetime, 2945 publications have been published within this topic receiving 51790 citations. The topic is also known as: Brassica napus & rape.
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TL;DR: The relationship between the N-uptake during the vegetation period and theN-residue after harvest was of major interest and following soil-preparation measures in the autumn, a continuous rise in the soil NO3-N-content was observed.
Abstract: Nitrogen Uptake and Nitrogen Residuals of Winter Oil-Seed Rape and Fallout Rape
The objective of the investigation was a study of the relationship between seed dry-matter production and vegetative dry-matter production in oil-seed rape crops and their dependence on the production conditions. In addition to the relationship between the N-uptake during the vegetation period and the N-residue after harvest was of major interest. Furthermore the potential for N-uptake in fallout rape was measured. Over two vegetation periods factorial field experiments with winter oil-seed rape, cv. Lirabon, different drilling techniques and different nitrogen fertilization levels were tested. Measured traits were: the dry-matter accumulation including root mass and fall-off leaf-material mass, the N-uptake of both the oil-seed crops and the fallout rape stands, and, simultaneously, the soil NO3-N content. Finally the harvest indices and the N-harvest indices were calculated.
Combined with a N-uptake of up to 330 kg N/ha, oil-seed rape crops produced up to 200 dt dry matter/ ha. At seed yield levels of 33dt/ha (d.m.), harvest indices varied from 0.14—0.23 and N-harvest indices varied from 0.30–0.50. As a result of the residue of vegetative plant material at harvest, leaf losses before harvest and the soil NO3-N-contents at harvest up to 275 kg N/ha remained in the field. After the harvest of oil-seed rape, the soil NO3-N-contents were quickly reduced by emerging and growing fallout rape stands. However, following soil-preparation measures in the autumn, a continuous rise in the soil NO3-N-content was observed.
27 citations
27 citations
TL;DR: By introducing of suitable varieties for delay cropping as well as by selection of varieties that produce reasonable economical yield and standard qualitative traits, it is possible to increase the under cultivation areas of this plant in the cold and temperate-cold regions with dry and semi-dry climates.
27 citations
TL;DR: The results suggest that the GSLs in the seeds of single-low cultivars, in the roots of both types at harvest, and in the leaves and roots of volunteer seedlings are the candidate cause of the generally observed phenomenon of inhibited growth of the crop following rapeseed.
Abstract: In crop rotations that include rapeseed (Brassica napus L.), the growth of the crops following rapeseed is sometimes inhibited. The aim of this study was to assess the role of glucosinolates (GSLs) in the inhibitory effect. Three cultivars with zero erucic acid content (Asakano-natane, Kizakino-natane, Nanashikibu: single-low cultivars) and one cultivar with zero erucic acid and low GSL contents (Kirariboshi: double-low cultivar) were grown. The GSL contents differed greatly depending on plant part, stage of development, and cultivar. Progoitrin and gluconapin were detected mainly in the seeds of the single-low cultivars. Their contents either did not change or increased slightly during the reproductive stage. The double-low cultivar Kirariboshi contained almost none of either progoitrin or gluconapin in any part during the reproductive stage. Glucobrassicanapin, glucobrassicin, and gluconasturtiin were detected, mainly in the roots, of all four cultivars, and tended either to decrease or to remain steady as plants matured. Dense stands of rapeseed seedlings that had germinated from seeds dropped at harvest grew together with the subsequent crop. The GSL contents in the leaves and roots of these seedlings were high. These results suggest that the GSLs in the seeds of single-low cultivars, in the roots of both types at harvest, and in the leaves and roots of volunteer seedlings are the candidate cause of the generally observed phenomenon of inhibited growth of the crop following rapeseed.
27 citations
01 Jan 1990
TL;DR: In 1985, the US Food and Drug Administration (FDA) granted GRAS (generally recognized as safe) status to low erucic acid rapeseed (canola) oil (National Archives and Records 1985).
Abstract: Prior to 1985, there were less than 20,000 hectares of rapeseed and canola cultivation annually in the United States. In 1985, the US Food and Drug Administration (FDA) granted GRAS (generally recognized as safe) status to low erucic acid rapeseed (canola) oil (National Archives and Records 1985). As the fatty acid composition of canola oil has been increasingly recognized by nutritionists as beneficial in human diets, domestic consumption of imported canola oil has increased (Foreign Agricultural Service 1989). Only 12,000 metric tons of canola oil were imported into the United States in 1985 compared to an estimated 205,000 metric tons in 1989. During this same period, imports of Canadian canola meal and seed for domestic processing increased dramatically. It is expected that US production of canola will increase to meet domestic demands for both the premium quality oil and the high protein meal (Auld et al. 1989).
27 citations