Abstract:
The response of the common cabbage (Brassica oleracea L. var. capitata L.) to boron fertilization in soils of the state of Paranii, Brazil, is provided Six types of soils, LRd; LRe, Ca₁; Ca₂, TRd, and LEd were selected, treated with macronutrient fertilizer, their pH was corrected, according to routine. The experiment was conducted in 2.5-L capacity pots, with 2 kg of each soil, in a greenhouse. Each type of soil, in triplicate samples, received boron treatment with boric acid: 0.0 g; 0.1 g; 0.2 g. Pots were kept at 70% water capacity retention for 7 days, after which they received 6 cabbage shoots. Two shoots were maintained and later only one was kept in each pot. The duration of the experiment was 8 weeks, after which harvest was undertaken. Plants were dried in stoves, weighted, ground, and conditioned for further analysis. Extractor HCl 0.05 mol L^-1 was used to determine boron in soils. Although soils Ca₁, LRd, and LEd gave significant responses to treatments, concentrations of available boron over 4 μg g^-1 were toxic to cabbages.