Anais da Escola Superior de Agricultura Luiz de Queiroz
URI permanente para esta coleçãohttps://thoth.dti.ufv.br/handle/123456789/13757
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Item Estudos sôbre a alimentação mineral do cafeeiro: XXVI. efeitos de deficiências múltiplas no aspecto, crescimento e composição mineral (nota preliminar)(Universidade de São Paulo, Escola Superior de Agricultura, 1969-11-14) Haag, H. P.; Sarruge, J. R.; Camargo, P. N.; Malavolta, E.Foi estudado o efeito das deficiências de nitrogênio, potássio, boro e zinco, isoladas ou combinadas de diversos modos no cafeeiro cultivado em solução nutritiva. Além das descrições dos sintomas de deficiência foram feitas análises químicas dos diversos órgãos das plantas; verificou-se também o efeito das deficiências no crescimento.Item Estudos sôbre a alimentação mineral do cafeeiro: XX. efeito da variação de pH no desenvolvimento e composição química do cafeeiro (Coffea arabica L., var. Mundo Nôvo) cultivado em solução nutritiva(Universidade de São Paulo, Escola Superior de Agricultura, 1968-10-21) Amorim, H. V. de; Scoton, L. C.; Haag, H. P.; Malavolta, E.Plantas jovens de Coffea arabica L., var. Mundo Nôvo foram cultivadas em solução nutritiva, sob o efeito de diferentes variações de pH (4,0 a 7,5) do substrato, a fim de se constatar o desenvolvimento e composição mineral. A melhor faixa de pH para o crescimento em altura, número de fôlhas, pêso da matéria fresca e sêca é de 4,0 a 6,0. A quantidade total de todos os macronutrientes absorvidos pelo cafeeiro diminui à medida que o pH se eleva.Item Estudos sobre a alimentação mineral do cafeeiro: XII. efeito da adubação na composição mineral das fôlhas(Universidade de São Paulo, Escola Superior de Agricultura, 1964) Malavolta, E.; Graner, E. A.; Haag, H. P.; Sarruge, J. R.Leaf samples from coffee plants under three different fertilizations, namely NPK, NP and PK, were collected for chemical analysis. It was found that the contents of N, K, Ca, Mg and S in the first, second, third and fourth pair of leaves were the same from the statistical point of view. On the onder hand, there was a significant effect of the position of the leaf in the branch on the P content, which was higher in the first pair. With the exception of the P level ,the four pairs of leaves are chemically uniform. Nevertheless it is not considered as convenient to mix all kinds of leaves into one sample, since the composition may vary a great deal when sampling is done some other time, such as the period of fruit growing. It is recommended therefore that either the third or the fourth pair leaves should be collected for routine work in foliar diagnosis.Item Estudos sôbre alimentação mineral do cafeeiro: VIII. Estudo da absorção e da translocação do radiozinco no cafeeiro (Coffea arabica L.)(Universidade de São Paulo, Escola Superior de Agricultura, 1962-02-02) Arzolla, J. D. P.; Haag, H. P.; Malavolta, E.O presente trabalho, em que se usou o Zn65, foi executado com a finalidade de se verificar o modo de mais fácil aproveitamento do zinco pela planta e a influência de fatores que afetam sua absorção, translocação e acumulo no cafeeiro, fatores esses representados por alguns micronutrientes, em várias concentrações. Trata-se de uma pequena contribuição para o estudo da carência de zinco, que afeta os cafezais no Estado de São Paulo.Item Estudos sobre a alimentação mineral do cafeeiro: VI Efeitos das deficiências de micronutrientes em Coffea arabica L. var. Mundo Novo cultivado em solução nutritiva(Universidade de São Paulo, Escola Superior de Agricultura, 1961-04-11) Malavolta, E.; Haag, H. P.; Johnson, C. M.Young coffee plants (Coffea arabica L., var. Mundo Novo) were grown in nutrient solution purified from micronutrients contaminants by the method of MUNNS & JOHNSON (1960). All plants, except those in the control treatment, wer given all macronutrients and all micronutrients except one which was omitted in order to induce its shortage. Symptoms of deficiency were obtained for all known micronutrients but chlorine. Measurements, observations and chemical analysis of leaves allowed the following main conclusions to be drawn. 1. The relative influence of micronutrients in growth-measured by the fresh weight of the entire plant - was as follows: -Fe -Zn -Cu -Mo -Mn complete = -B = -CI. that is: the omission of iron from the nutrient solution caused the severest reduction in growth; lack of B and Cl had no effect. 2. Symptoms of deficiency of B, Fe, Mn, and Zn were found to be in good agreement with those in the literature. Effects of Cu and Mo shortage, however, had not been described so far: In the case of the Cu-deficient plants, the younger leaves were distorted, having an "S" shape, due probably to lack of growth of the veins; they lost their green color and developed rather large, necrotic patches near the margins. When molybdenum was omitted from the nutrient solution yellow spots develop near the margen of subterminal (fully mature) leaves; they became necrotic; there was a characteristic downward curling of the leaf blade along the mid rib so that the opposite edges touched each other underneath. 3. The levels of micronutrients found in normal and deficient leaves are given in Table 4. It is hoped that those values will serve as a basis of judgement of micronutrient contents found in leaves of field grown plants.Item Nota preliminar sôbre a absorção e a translocação do radiozinco no cafeeiro [Coffea arabica] cultivado em solução nutritiva(Universidade de São Paulo, Escola Superior de Agricultura, 1956) Arzolla, J. Dal Pozzo; Haag, H. P.; Malavolta, E.Two water-culture experiments were carried out to study the absorption and the translocation of radiozinc in young coffee plants as influenced by two factors, namely, concentration of heavy metals (iron, manganese, copper and molybdenum) and method of application. Inert zinc was furnished at a uniform rate of 0.05 p.p.m.; the levels of iron supply were 0, 1.0 and 10 p.p.m.; manganese was supplied in three doses 0, 0.5, and 5 p.p.m.; copper - 0, 0.02, and 0.2 p.p.m.; molybdenum - 0, 0.01 and 0.1 p.p.m. When applied to the nutrient solution the activity of the radiozinc was 0.15 microcuries per plant. In the study of the leaf absorption, the radiozinc was supplied at the level of 0.10 microcuries per plant; in this case the material was brushed either on the lower or in the upper surface or both of two pairs of mature leaves. In both experiments the absorption period was 8 weeks. The following conclusions can be drawn: 1. Among the heavy metals herein investigated the iron concentration did not affecc the uptake of the radiozinc; by raising the level of Mn, Cu and Mo ten times, the absorption dropped to 50 per cent and even more whe compared with the control plant; however, when these micronutrients were omitted from the nutrient solution an increase in the uptake of zinc was registered only in the minus - Cu treatment. The effects of high leveds of Mn, Cu and Mo probably indicate an interionic competition for a same site on a common binding substance in the cell surface. 2. The absorption of the radiozinc directly applied to the leaf surface reached levels as high as 8 times that registered when the root uptake took place. Among the three methods of application which have been tried, brushing the lower surface of the leaves proved to be the most effective; this result is easily understood since the stomatal openings of the coffee leaves are preferentially located in the lower surface. In this treatment, about 40 per cent of the activity was absorbed and around 12 per cent were translocated either to the old or to the newer organs. 3. Data herein presented suggest that leaf sprays should be preferred - rather than soil applications - to control zinc deficiency in coffee plants when growing in field conditions.