The flowering white cabbage plant, Brassica chinensis L. var. parachinensis (Bailey) Sinskaja is often cultivated in China, Australia and other southeastern Asian countries and introduced in Brazil in 1992. There is little information regarding the mineral nutrition of this Brassica in the Brazilian conditions. The effect of sources and splitting of nitrogen in the productivity and ratio of macro and micronutrients in the shoot of this vegetable were evaluated. The experiment was carried out in a greenhouse in pots with capacity for 5 dm³. The experimental design was a randomized block design, in a 2 x 6 factorial scheme with three replications. The nitrogen, calcium nitrate and urea sources were evaluated in different splitting for the 105 mg dm-3 of N dose, in the sowing, 15 and 30 days after sowing, in the following ratios: 50%-50%-0%, 0%-50%-50%, 75%-25%-0%, 25%-75%-0%, 25%-50%-25% and 33%-33%-33%. The plants were harvested 40 days after sowing. The biggest productions of fresh and dry weight of the shoot, dry matter of root, leaf number and the biggest ratio of N, Ca and Mn in the shoot were reached with the nitric source (calcium nitrate). The best results concerning the splitting were obtained when fertilization took place during the sowing followed by two side dressing applications, one 15 days and another 30 days after sowing, in the proporcions 33%-33%-33% and 25%-50%-25%, for the sources evaluated.
Brassica chinensis L. var. parachinensis (Bailey) Sinskaja; urea; calcium nitrate; nutrients accumulation
