Resumo
In this paper it is presented a detailed fiber analysis of leaves of twenty mature sisal plants taken from four positions on the plant: 1) first developped leaves (75°); 2) leaves usually cut for fiber extraction (50°) ; 3) leaves adjacent to the central bud (25°) ; and 4) young leaves not yet unfolded from the central bud (0°). The results herein reported are against the prevailing opinion that the sisal leaf only matures after it has unfolded from the central bud. Neither the physical nor the chemical fiber characteristics were adversely affected even if cutting was carried out up to the very young leaves. This practice, however, cannot yet be advised, as it desirability also depends on the effects of the severe cutting upon the subsequent rate of growth of the new leaves. A cutting trial including the cut of all leaves every four months is still in progress. Preliminary results have shown that the plants of this treatment were able to develop eight leaves until the second cut, with an average fiber content of 3,7%.
A severidade de corte no sisal e analise tecnológica da fibra
J. C. Medina; F. A. Correia
SUMMARY
In this paper it is presented a detailed fiber analysis of leaves of twenty mature sisal plants taken from four positions on the plant: 1) first developped leaves (75°); 2) leaves usually cut for fiber extraction (50°) ; 3) leaves adjacent to the central bud (25°) ; and 4) young leaves not yet unfolded from the central bud (0°).
The results herein reported are against the prevailing opinion that the sisal leaf only matures after it has unfolded from the central bud. Neither the physical nor the chemical fiber characteristics were adversely affected even if cutting was carried out up to the very young leaves. This practice, however, cannot yet be advised, as it desirability also depends on the effects of the severe cutting upon the subsequent rate of growth of the new leaves.
A cutting trial including the cut of all leaves every four months is still in progress. Preliminary results have shown that the plants of this treatment were able to develop eight leaves until the second cut, with an average fiber content of 3,7%.
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LITERATURA CITADA
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- 3. Hing, T. K. Developmental morphology of the leaf of maguey. The Philip. Agriculturist 29 : 185-225. 1940.
- 4. Lock, G. W. The Sisal Experimental Station. Report for the year 1936. Depart. Agric. Tanganyika Territory Pamphlet 16 : 1-11. 1937.
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- 6. Richter, G. A. Purified wood fiber. A study of the physical and chemical properties. Ind. and Eng. Chem. 23 : 131-139. 1931.
- 7. Tobler, Fr. Em Sisal und undere Agavefasern. Deutscher Auslandverlag Walter Bangert, Berlin, pg. 1-104, fig. 1-44. 1931.
- 8. Zemplén, G. e F. F. Nord. Em Abderhalden Handbuch der Biologischen Arbeitsmethoden, Abt. 1, Chemische Methoden, Teil 5 : pg. 1-1101. 1922.
Datas de Publicação
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Publicação nesta coleção
08 Jun 2010 -
Data do Fascículo
1947
