Padrões para avaliação do estado nutricional do tomateiro para indústria
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Data
2017-09-29
Autores
Nowaki, Rodrigo Hiyoshi Dalmazzo [UNESP]
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Universidade Estadual Paulista (Unesp)
Resumo
A avaliação do estado nutricional, a partir da análise foliar, é importante, como complemento à análise química do solo, para a identificação de desequilíbrio nutricional e auxiliar na recomendação de fertilizantes. Tal avaliação torna-se ainda mais importante, quando se trata do tomate de indústria, uma das hortaliças de maior valor econômico no Brasil e que os fertilizantes chegam a representar 18 % do custo de produção. Para tanto, conceitos de interpretação à diagnose do estado nutricional foram desenvolvidos, como o Sistema Integrado de Diagnose e Recomendação (DRIS) e Diagnose da Composição Nutricional (CND), abordagem CND-clr (relação log centralizada) e CND-ilr (relação log isométrica). Com isso, o objetivo da realização do presente trabalho foi obter as normas e a faixa de suficiência, bem como comparar tais metodologias, a partir dos dados de nutrientes (N, P, K, Ca, Mg, S, B, Cu, Fe, Mg e Zn). Quando analisados individualmente, com exceção do método DRIS, os métodos CND-clr e CND-ilr, apresentaram boas performances e com bons parâmetros de calibração dos métodos. Contudo, quando analisados de maneira conjunta, segundo a distância de Mahalanobis e a partição de Cate-Nelson, todos os métodos, incluindo a transformação log neperiano do teor, não apresentaram diferença significativa.
The evaluation of nutritional status through leaf analysis is important, as a complement to soil chemical analysis, for the identification of nutritional imbalance and ancillary fertilizer recommendation. This evaluation becomes even more important when it comes to the tomato industry, one of the vegetables with the highest economic value in Brazil, and that fertilizers represent 18% of the cost of production. For this purpose, concepts of interpretation and diagnosis of nutritional status were developed, such as the Diagnosis and Recommendation Integrated System (DRIS) and Compositional Nutrient Diagnosis (CND), CND-clr (centralized log ratio) and CND-ilr (isometric log rato) approach. Thus, the goal of the implementation of this work was to obtain standards and sufficiency range and compare these methods, from the nutrient data (N, P, K, Ca, Mg, S, B, Cu, Fe , Mn and Zn). When analyzed individually, with the exception of the DRIS, the CND-clr and CND-ilr methods presented good performances and with good calibration parameters of the methods. However, when analyzed together, according to the Mahalanobis distance and the Cate-Nelson partition, all methods, including log transformation of the content, showed no significant difference.
The evaluation of nutritional status through leaf analysis is important, as a complement to soil chemical analysis, for the identification of nutritional imbalance and ancillary fertilizer recommendation. This evaluation becomes even more important when it comes to the tomato industry, one of the vegetables with the highest economic value in Brazil, and that fertilizers represent 18% of the cost of production. For this purpose, concepts of interpretation and diagnosis of nutritional status were developed, such as the Diagnosis and Recommendation Integrated System (DRIS) and Compositional Nutrient Diagnosis (CND), CND-clr (centralized log ratio) and CND-ilr (isometric log rato) approach. Thus, the goal of the implementation of this work was to obtain standards and sufficiency range and compare these methods, from the nutrient data (N, P, K, Ca, Mg, S, B, Cu, Fe , Mn and Zn). When analyzed individually, with the exception of the DRIS, the CND-clr and CND-ilr methods presented good performances and with good calibration parameters of the methods. However, when analyzed together, according to the Mahalanobis distance and the Cate-Nelson partition, all methods, including log transformation of the content, showed no significant difference.
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Palavras-chave
Análise foliar, Diagnose da Composição Nutricional, faixa de suficência de nutrientes, Solanum lycopersicum, Leaf analysis, Compositional Nutritional Diagnosis, Nutrient sufficiency range, Solanum lycopersicum