科研之友
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摘要
Brassica chinensis var. parachinensis 谷 uma hortali a folhosa, de ciclo curto, introduzida no Brasil em 1992, em fun o de sua excelente qualidade nutricional. Apresenta elevado teor de b-caroteno, vitamina C, Ca e Fe, o que a torna importante alimento,especialmente no combate 角 anemia. Este trabalho teve como objetivo avaliar a produtividade biol車gica e agron mica da couve-da-Mal芍sia, cultivada sob defici那ncia de N, P, K, Ca, Mg, S, B, Cu, Fe, Mn, Mo e Zn e comparada com o tratamento-testemunha que incluiu todos os macro e micronutrientes. As plantas cultivadas na aus那ncia de N e Pconseguiram completar o ciclo, mas foram significativamente menos produtivas e pouco desenvolvidas em rela o 角s que receberam nutri o completa. Al谷m disso, apresentaram colora o das folhas verde-acinzentada e arroxeamento do pec赤olo e nervuras. Na aus那nciade B, todas as plantas morreram entre 30 e 37 dias ap車s a semeadura e, na aus那ncia de S, elas n o produziram frutos, o que mostra a importancia destes dois nutrientes para essa Brassicaceae. Brassica chinensis var. parachinensis is a vegetable with short cycle, which was introduced in Brazil in 1992 due to its highnutritional qualities. It presents high concentration of b-carotene, vitamin C, Ca, and Fe, becoming an important food for the prevention of anemia. The aim of this paper was to evaluate the biological and agronomic productivity of plants grown under N, P, K, Ca, Mg,S, B, Cu, Fe, Mn, Mo, and Zn deficiency. The results were compared with plants grown with all macro and micronutrients. Plants cultured without N and P completed their cycle, but had lower yield than those cultured with complete nutrition. Additionally, they had green-grayish leaves, and purple petiole and veins. Plants cultured without B died between 30 and 37 days after sowing, and without S they did not produce fruits. These results show the importance of S and B to this Brassicaceae.
