A pot experiment was conducted in a green house in piracicaba, Brazil, in order to determine the visual symptoms of deficiency, and the effects of macronutrients omission in P. caribaea var. hondurensis, P. caribaea var. bahamensis and P. caribaea var. caribaea seedlings dry matter production

aesalq Anais da Escola Superior de Agricultura Luiz de Queiroz An. Esc. Super. Agric. Luiz de Queiroz 0071-1276 2316-8935 Universidade de São Paulo; Escola Superior de Agricultura Piracicaba, SP, Brazil The following treatmente were employed: complete, without nitrogen, without phosphorus, without potassium, without calcium, without magnesium, and without sulphur. Washed sand was used as a substrate, being the plants watered twice a day with the correponding nutrientsolution. After the deficiency symptoms establishment, the plants were cut and separated in upper needles, lower nedies, branches and roots, dried at 75 ºC and weighed. Seedlings dry matter productions are depressed by omission of N, P and S for P. caribea var. hondurensis,by omission of N and S for P. caribae var. caribaea and by omission of N for Pcaribae var. bahamensis, being upper needles' and branches' dry matter productions the major depression sources. P. caribaea seedlings dry matter productions aren't significantly affected by low levels of K, Ca and Mg in nutritive solution. Diagnóstico da carência de macronutrientes em tres variedades de Pinus caríbaea I. sintomas visuais e efeitos sobre a produção de materia seca* A pot experiment was conducted in a green house in piracicaba, Brazil, in order to determine the visual symptoms of deficiency, and the effects of macronutrients omission in P. caribaea var. hondurensis, P. caribaea var. bahamensis and P. caribaea var. caribaea seedlings dry matter production Hermini E.P. MartinezI; Henrique P. HaagII; Claudio H. BruckerI; Antonio R. DechenII IFundação Universidade Federal do Mato Grosso - Curitiba, MT IIE.S.A. "Luiz de Queiroz" - USP, Piracicaba, SP RESUMO Com o objetivo de determinar os sintomas visuais de carência e os efeitos da omissão de macronutrientes na produção de matéria seca de mudas de Pinus caribaea var. hondurensis, Pinus caribaea var. bahamensis e Pinus caribaea var. cavibaea, realizou-se um experimento de vasos, em casa de vegetação, em Piracicaba, SP. Foram empregados os tratamentos: completo, com omissão de nitrogênio, com omissão de fósforo, com omissão de potássio, com omissão de cálcio, com omissão de magnésio e com omissão de enxofre. Usou-se sílica lavada como substrato, irrigando-se as plantas duas vezes ao dia com as soluções correspondentes. Após o estabelecimento dos sintomas de carência as plantas foram colhidas, separadas em acículas superiores, acículas inferiores, ramos e raízes, secas a 75 ºC em estufa e pesadas. Descreveram-se os sintomas de carência, sendo que só os de nitrogênio para as três variedades, fósforo e magnésio para Pinus caribaea var. hondurensis e enxofre para Pinus caribaea var. caribaea, foram características. As produções de matéria seca foram reduzidas pelas omissões de nitrogênio, fósforo e enxofre para Pinus caribaea. var. hondurensis, nitrogênio e enxofre para Pinus caribaea. var. caribaea, e nitrogênio para Pinus caribaea var. bahamensis. SUMMARY The following treatmente were employed: complete, without nitrogen, without phosphorus, without potassium, without calcium, without magnesium, and without sulphur. Washed sand was used as a substrate, being the plants watered twice a day with the correponding nutrientsolution. After the deficiency symptoms establishment, the plants were cut and separated in upper needles, lower nedies, branches and roots, dried at 75 ºC and weighed. Seedlings dry matter productions are depressed by omission of N, P and S for P. caribea var. hondurensis,by omission of N and S for P. caribae var. caribaea and by omission of N for Pcaribae var. bahamensis, being upper needles' and branches' dry matter productions the major depression sources. P. caribaea seedlings dry matter productions aren't significantly affected by low levels of K, Ca and Mg in nutritive solution. Texto completo disponível apenas em PDF. Full text available only in PDF format. LITERATURA CITADA Entregue para publicação em 15/10/1985. * Parte da tese do 1º autor apresentada à E.S.A. "Luiz de Queiroz" - USP. BAULE, H. e C. FRICKER, 1970. The fertilizer treatment of forest tree. Translate by CL. WITTLES. BLV Verlagesllschaft. Munique. 260p. The fertilizer treatment of forest tree 1970 BAULE H. FRICKER C. WITTLES CL. CAMERON, P.M.; S.J. RANCE e E.R. WILLIAMS, 1982. 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