efeitos da utilização de misturas de adubos com ou sem enxofre na precocidade e nas características do capulho e da fibra do algodoeiro effects of mixtures of fertilizers with or without sulfur on cotton earliness and some characteristics of fibers and bolls
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ID: 180697
1984
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Abstract
São apresentados resultados referentes à precocidade e características do capulho e da fibra do algodoeiro, obtidos em ensaio de caráter permanente, no município de Guaíra (SP), em gleba de Latossolo Roxo, durante o período 1974/75-1977/78, utilizando-se a variedade 'IAC 16'. Além da reação ao fósforo, foi planejado um estudo conjunto visando observar a resposta do algodoeiro à aplicação de misturas de adubo contendo fósforo e enxofre em quantidades variáveis. A análise e a interpretação dos resultados permitiram as seguintes conclusões: a) Adubações com superfosfato triplo ou simples, em solo deficiente em fósforo, resultaram em maior precocidade no ciclo do algodoeiro, enquanto o uso de sulfato de amônio em cobertura tendeu a prolongar esse ciclo; b) Ambas as fontes citadas de fósforo proporcionaram aumentos significativos no peso de capulho e no comprimento das fibras, enquanto apenas o superfosfato simples aumentou sensivelmente o peso de cem sementes e o índice Micronaire, que representa o complexo finura + maturidade da fibra; c) As características porcentagem de fibras, uniformidade de comprimento, resistência e maturidade das fibras, não foram alteradas significativamente pelos tratamentos estudados.
Effects of fertilizers mixtures with or without sulfur on cotton earliness and some characteristics of fiber and bolls, obtained in a field experiment carried out at Guaira County (SP) in a oxisoil -"Latossolo Roxo" - during the years of 1974/75 to 1977/78, are related. The following conclusions can be drawn from the results: a - soil fertilizations with concentrated superphosphate or ordinary superphosphate resulted in early picking of cotton crop. Plant cycle, was delayed with split application of ammonium sulphate; b - both concentrated superphosphate and ordinary superphosphate increased significantly boll weight and fiber length, but only ordinary superphosphate gave significant increases on seed weights and Micronaire values; c - length uniformity, maturity, strength and percentage of fiber were not influenced by these treatments.
Effects of fertilizers mixtures with or without sulfur on cotton earliness and some characteristics of fiber and bolls, obtained in a field experiment carried out at Guaira County (SP) in a oxisoil -"Latossolo Roxo" - during the years of 1974/75 to 1977/78, are related. The following conclusions can be drawn from the results: a - soil fertilizations with concentrated superphosphate or ordinary superphosphate resulted in early picking of cotton crop. Plant cycle, was delayed with split application of ammonium sulphate; b - both concentrated superphosphate and ordinary superphosphate increased significantly boll weight and fiber length, but only ordinary superphosphate gave significant increases on seed weights and Micronaire values; c - length uniformity, maturity, strength and percentage of fiber were not influenced by these treatments.
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sabino1984bragantiaefeitos
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| Authors | ;Nelson Paulieri Sabino;Nelson Machado da Silva |
| Journal | revista espanola de salud publica |
| Year | 1984 |
| DOI |
10.1590/S0006-87051984000100008
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