Comparison of chinoli (Brassica campestris subsp. oleifera × subsp. chinensis) and B. napus oilseed rape using different growth regulators, plant population densities and irrigation treatments

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Abstract
SUMMARY: Experiments were carried out between 1983 and 1987 in a cool but dry environment in Tasmania to evaluate the growth, development and yield of chinoli compared with the Brassica napus cultivar, Marnoo. In 1983/84 chinoli plants became large, with many pods, but then lodged at the stage of peak pod development. Seed yields were less than half those of the B. napus lines and only slightly better than that of B. campestris, ‘Jumbuck’. In subsequent experiments, lodging was either delayed or completely eliminated, either by the application of plant growth regulators, particularly PP333, or by using low populations or late sowing. However, these remedial measures were all associated with lower seed yields. Early flowering before the achievement of adequate plant size and then the setting of a large number of pods resulting in few seeds in each were identified as the main reasons for the low seed yields in chinoli. Irrigation after anthesis increased numbers of seeds/pod and thus gave better seed yields, but still not as high as those of Marnoo.