Optimum range of macronutrients in Chinese cabbage (Brassica pekinensis [Lour] Rupr. cv. Nagaoka 50) grown under floating mulch

Yields of Chinese cabbage (Brassica pekinensis [Lour] Rupr. cv. Nagaoka 50) , grown at Granada (Southern Spain)., and covered with the semiforcing floa ting mulch technique (polyethylene: T-1, and polypropylene: T2) were compar ed with the yield of uncovered control plants (T-0,). Five samplings were c ollected. The dry material was used to determine: N, P, S, NH4+ NO3-, CI-, SO4= Ca, Mg, Na and K. Optimum foliar ranges were calculated from yield and analytical values. The floating mulch technique provides favourable microc limatic conditions, thus making T-1 and T-2 more efficient than T-0 in the uptake and transport of macronutrients.