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| Grant,T. J.; Costa,A. S.; Mendes,H. C.; Paiva Neto,J. E. de; Catani,Renato A.. |
| The present paper reports the results of general studies undertaken to determine the relative importance of soil moisture and light on symptom expression of the tristeza disease. It also includes data on the effects of the disease on transpiration and chemical composition of infected plants and records the results of attempts to inactivate the tristeza virus in budwood by means of hot water and chemical treatments. In the present tests, using potted plants, tristeza disease symptoms were observed to occur eight to ten weeks after inoculation on plants maintained in standing water and on those having a daily application of 200cc of water. In contrast to this relatively rapid and positive symptom expression, it required 28 weeks before definite advanced... |
| Tipo: Info:eu-repo/semantics/article |
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| Ano: 1950 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87051950000200002 |
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| Franco,C. M.; Mendes,H. C.. |
| Coffee plants (Coffea arabica L.) were grown in nutrient solutions for the purpose of studying deficiency symptoms of the following elements : nitrogen, phosphorus, potassium, magnesium, calcium, sulphur and iron. The methods employed in the growing of coffee plants in the nutrient solutions are described. After preliminary tests with several nutrient solutions Hoagland's formula was selected as most suitable for the present tests. However, the quantity of phosphate employed in the basic nutrient solution was reduced to one third of that given in Hoagland's formula. This reduction in phosphate was made because of the previous results obtained by Jacob which seemed to indicate that the coffee plant requires only very small amounts of phosphorus. In the... |
| Tipo: Info:eu-repo/semantics/article |
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| Ano: 1949 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87051949000300002 |
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