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The effectiveness of intercropping depends on the complementarity or the adaptive capacity of species during the period of coexistence. Kale is a plant that displays differing responses to environmental factors, and may therefore display different behaviour when grown with other species. The aim of this study was to analyse the physiological behaviour and competitive ability of kale when intercropped with the Welsh onion, coriander, basil and parsley. The experiment was carried out under field conditions, in a randomised block design with nine treatments and five replications. The following were evaluated: net photosynthesis, stomatal conductance, CO2 concentration of the sub-stomatal chamber, transpiration rate, ratio between the CO2 concentration of the substomatal chamber and the CO2 concentration of the environment, instantaneous carboxylation efficiency, aggressivity index, and the competitive and compensation ratios. The kale plants intercropped with coriander displayed values for net photosynthesis (A) and instantaneous carboxylation efficiency (A/Ci) of 18.75 μmol CO2 m -2 s and 0.060 respectively, the lowest values for all the treatments under evaluation. The kale displayed less competitive ability. The more aggressive crops were the Welsh onion (2.25) and coriander (2.08). The parsley displayed the lowest competitive effect, having no effect on yield in the kale. The conclusion is that the coriander was prejudicial to the photosynthetic performance of the kale. The intercropping system with parsley was the most advantageous, due to the balance seen in interference between species for productive resources.

australian journal of crop science

Physiological performance and competitive ability in kale (Brassica oleracea var. acephala ‘Manteiga da Georgia’) intercropped with important aromatic species and herbs