Maataoui A, Talouizte A, Benbella M, Bouhache M
Ecole Nationale d'Agriculture, Meknès, Maroc.
Commun Agric Appl Biol Sci. 2005;70(1):61-6.
Under Mediterranean climate, oilseed rape is subjected especially to the competition of weeds with respect to water. Herbicides registered for this crop do not effectively control species of the same family, in particular Sinapis alba and Sinapis arvensis. Moreover, there are no results of the effect of plant density on the competitiveness of these species. The purpose of this experiment was to determine if the competitiveness of the species varies according to the total density. The experiment was carried out in pots under greenhouse conditions, according to a replacement series method. Plant densities tested were 2, 4 and 8 plants per pot. The results of the replacement series diagram and those of relative crowding coefficients showed that Brassica napus was the most competitive, whatever the density is. This classification is explained primarily by leaf area. Indeed, the intraspecific competition due to B. napus has affected more its leaf area than the interspecific competition. Conversely, the intraspecific competition due to S. arvensis has less affected its leaf area than the interspecific competition. Regarding S. alba, the intraspecific competition effect was less severe than the interspecific competition effect due to B. napus and more severe than the interspecific competition effect due to S. arvensis on S. alba
在地中海气候条件下，油菜在水分方面特别容易受到杂草的竞争。登记用于这种作物的除草剂不能有效控制同科物种，特别是白芥和田野白芥。此外，关于种植密度对这些物种竞争力的影响尚无研究结果。本实验的目的是确定这些物种的竞争力是否随总密度而变化。实验在温室条件下的花盆中按照取代系列法进行。测试的种植密度为每盆2株、4株和8株。取代系列图的结果和相对拥挤系数的结果表明，无论密度如何，甘蓝型油菜的竞争力最强。这种分类主要由叶面积来解释。实际上，甘蓝型油菜的种内竞争对其叶面积的影响大于种间竞争。相反，田野白芥的种内竞争对其叶面积的影响小于种间竞争。关于白芥，其种内竞争效应不如甘蓝型油菜对白芥的种间竞争效应严重，但比对田野白芥的种间竞争效应严重。
