Resumo
I. This paper deals with an experiment carried out to evaluate the effect of sugar cane upper end on the composition of the stalks and juice of sugar cane harvest as a raw material for the sugar industry. The variety studied was CB 41-76. The data were collected from plant cane at intervals of a two weeks, always from the same field, from a small central area of 3.000 square meters approximately, 60 stalks were cut in each occasion, randomly chosen from the whole area. They were afterwards separated into three groups of 20 stalks one for each of the treatments, namely: a) Complete stalk, with no leaves or sheaths. b) Stalks harvested by the technique of REYNOSO, that is, as usually done in practice. c) Stalks with the tops completely cut out, that is, cut by the techinique of REYNOSO and then with 3 other top internodes eliminated. The treatments caused significant differences on the weight of cane and coefficient of purity of juice, but the percentual differences between the average treatments a and c is 13% and 2%, respectively. II. Treatment differences for cane pol, cane fibre, brix, juice pol, reducing sugars, juice ashes, glucose coefficient, saline coefficient and available sucrose (pol) per cent were not significant. III. Time of harvest was an important factor affecting the composition of the cane and the juice. This paper shows that there is no sound basis for the heavy fines applied some sugar mills to planters who do not cut low enough the tops of the cane stalks.
Influência do desponte sôbre a composição do colmo e do caldo da cana-de-açúcar: III. Var. CB 41-76* * Trabalho realizado com o auxílio da Fundação de Amparo à Pesquisa do Estado de São Paulo e da Fundação Rockefeller.
Enio R. de Oliveira; Octávio Valsechi; F. Pimentel Gomes; Clovis P. de Abreu
Escola Superior de Agricultura "Luiz de Queiroz"
SUMARY
I. This paper deals with an experiment carried out to evaluate the effect of sugar cane upper end on the composition of the stalks and juice of sugar cane harvest as a raw material for the sugar industry. The variety studied was CB 41-76.
The data were collected from plant cane at intervals of a two weeks, always from the same field, from a small central area of 3.000 square meters approximately, 60 stalks were cut in each occasion, randomly chosen from the whole area. They were afterwards separated into three groups of 20 stalks one for each of the treatments, namely:
a) Complete stalk, with no leaves or sheaths.
b) Stalks harvested by the technique of REYNOSO, that is, as usually done in practice.
c) Stalks with the tops completely cut out, that is, cut by the techinique of REYNOSO and then with 3 other top internodes eliminated.
The treatments caused significant differences on the weight of cane and coefficient of purity of juice, but the percentual differences between the average treatments a and c is 13% and 2%, respectively.
II. Treatment differences for cane pol, cane fibre, brix, juice pol, reducing sugars, juice ashes, glucose coefficient, saline coefficient and available sucrose (pol) per cent were not significant.
III. Time of harvest was an important factor affecting the composition of the cane and the juice.
This paper shows that there is no sound basis for the heavy fines applied some sugar mills to planters who do not cut low enough the tops of the cane stalks.
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AGRADECIMENTOS
Os autores são gratos à Diretoria da Refinadora Paulista S/A. pelo gentil fornecimento da matéria prima, tornando possível a execução do presente trabalho.
Os agradecimentos são também extensivos aos funcionários da mesma, especialmente, nas pessoas do Dr. Crucciano Cricciani, Chefe da Secção Agrícola e ao Sr. Antonio Brunharo, Chefe do Setor Agrícola de Taquaral, da Usina Monte Alegre, em Piracicaba.
BIBLIOGRAFIA
- ALMEIDA, R.J., O. Valsechi, F.P. Gomes, E. M. Cardoso e N. Camolesi - 1952 - El Florescimento en la variedad de caña Co 421, Memoria de la XXV Conf. An., Assoc. Tecn. Azuc. de Cuba: 99 - 120 -Havana.
- ARRUDA, H.C. - 1962 - Variedades de Cana, III Sem. Ferm. Alc., Fermentação do Caldo de Cana, I; 8-17, I. Zimotécnico, Piracicaba.
- ASSOCIATION OF OFFICILAL AND AGRICULTURAL CHEMISTS - 1960 - Official Methods of Analysis, 9.Ş ed., A.O.A.C., Washington
- BROWNE, C.A. e F. W. Zerban - 1941 - Physical and Chemical Methods of Sugar Analysis, 3.Ş ed. John Wiley & Sons, Nova York.
- ESTORD, G., - 1957 - L'Industrie du Sucre de Cannes, Dunod, Paris.
- GOMES F.P. - 1963 - Curso de Estatística Experimental, 2.Ş ed., Piracicaba.
- LANE, J.H. e L. Eynon - 1934 - Determination of Reducing Sugars by Fehling's Solution With Methilene Blue Indicator, Norman Rodger, Londres.
- OLIVEIRA, E.R., O. Valsechi, F.P. Gomes e C.P. Abreu - 1963 - Influência do desponte sôbre a composicão do côlmo e do caldo de cana-de-açúcar. II. Var. Co 419, Bol. Tec. Cient., E.S.A. "Luiz de Queiroz"., (19), Piracicaba.
- REYNOSO, A., - 1878 - Ensaios sôbre el Cultivo de la Caña de Azúcar, 3.Ş ed., Ernest Leroux, Paris.
- SPENCER, G.L. e G.P. Meade - 1932 - Manual de Fabricantes de azúcar de Caña y Químicos Azucareros, Trad. C.J. Bourbakis, 7.Ş ed., John Wiley & Sons, Nova York.
- VALSECHI O., F.P. Gomes, E.R. de Oliveira e C.P. de Abreu - 1961 - Influência do Desponte Sôbre a Composição do Côlmo e do Caldo de Cana-de-Açúcar. I. Var. Co 421, Anais da E.S.A. "Luiz de Queiroz", XVIII: 5-34, Piracicaba.
- VASQUEZ, E.A., - 1951 - Caña de Azúcar: Utilization de los Resíduos de la Indústria Azucareira, Editorial Técnico Azucarero, Havana.
Datas de Publicação
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Publicação nesta coleção
27 Jun 2012 -
Data do Fascículo
1964
