It is recommendable that the introduction of a new culture in a region be previously evaluated in the yield and nutrition aspects under local soil and climatic conditions. Thus, since 1992 when Brassica chinensis L. var. parachinensis was introduced in Brazil, this variety has been studied by Brazilian researchers. The experiment was conduced in a greenhouse, in randomized blocks, with five treatments and four replicates, including four doses of nitrogen (105; 210; 315 and 420 kg ha-1) and the control treatment to evalute the effect of nitrogen doses on the yield and the accumulation of nutrients by plants of this variety. Plants were planted in pots of 5 dm³ containing a Red Latosol dystrophic soil. The nitrogen was applied three times, when sowing (30%), at 15 and at 30 days after sowing (35 + 35%). Fresh and dry mass of the aerial part and roots of the plants, number of leaves, stem diameter, and the accumulation of N, P, K, Ca, Mg, S, B, Cu, Fe, Mn, and Zn by aerial part of the plants were evaluated. The best dose of nitrogen was 210 kg ha-1, where the highest yield and nutrient absorption were registered, except N, Mn, and Zn that increased linearly.
Brassica chinensis L. var. parachinensis (Bailey) Sinskaja; "tsoi sum"; nitrogen fertilization
