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NUTRITIONAL DIAGNOSIS IN HYBRID COCONUT CULTIVATED IN NORTHEASTERN BRAZIL THROUGH DIAGNOSIS AND RECOMMENDATION INTEGRATED SYSTEM (DRIS)

ABSTRACT The assessment of the nutritional status of plants by leaf diagnosis such as the Diagnosis and Recommendation Integrated System (DRIS) has stood out among traditional methods of interpreting the results of plant tissue analysis. For coconut, nutritional monitoring through foliar analysis ha...

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Published in:Revista Brasileira de Fruticultura 2017, Vol.39 (1)
Main Authors: SALDANHA, EDUARDO CÉZAR MEDEIROS, SILVA JUNIOR, MÁRIO LOPES DA, LINS, PAULO MANOEL PONTES, FARIAS, SAMUEL CHRISTIAN COHEN, WADT, PAULO GLULHERME SALVADOR
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Language:English
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Summary:ABSTRACT The assessment of the nutritional status of plants by leaf diagnosis such as the Diagnosis and Recommendation Integrated System (DRIS) has stood out among traditional methods of interpreting the results of plant tissue analysis. For coconut, nutritional monitoring through foliar analysis has been pointed as an efficient method for fertilizer recommendation, and the results have been traditionally interpreted using the critical level of sufficiency ranges criteria. The aim of this study was to evaluate the nutritional status and establish nutritional standards for the cultivation of hybrid coconut in the municipality of Moju, Pará, using DRIS. The leaf analysis and productivity results of 134 observations for the period 2001-2011 were used to form the database. The most common deficiencies found were lack of K, and possibly excess of Mg. The order of nutrient limitation was K> P> Ca> Fe> N> O> B> Zn> Cu> Mn> Mg. Ca, Fe and K nutrients are more likely to positively respond to fertilization, since Mg, Cu and Mn were diagnosed as having the greatest likelihood of negative response to fertilization. It was also found that N and P are elements that are in the best nutritional balance condition. Regression equations for the relationship between nutrient content in hybrid coconut leaves and its DRIS indexes were adjusted, which allowed establishing nutrient reference values based on DRIS. RESUMO A avaliação do estado nutricional de plantas por meio da diagnose foliar, como o Sistema Integrado de Diagnose e Recomendação (DRIS), vem destacando-se dos métodos tradicionais de interpretação dos resultados da análise de tecido vegetal. Para o coqueiro, o acompanhamento nutricional por meio de análise foliar é apontado como método eficiente para a recomendação de adubação, e os resultados têm sido tradicionalmente interpretados com a utilização do critério do nível crítico e das faixas de suficiência. Os objetivos deste trabalho foram avaliar o estado nutricional e estabelecer padrões nutricionais para a cultura do coqueiro híbrido, utilizando o método DRIS. O trabalho foi realizado em área comercial de coqueiros no município de Moju-PA. Utilizou-se, para formar o banco de dados, de resultados de análise foliar e de produtividade de 134 observações referentes ao período de 2001 a 2011. Verificou-se deficiências mais frequentes para o elemento K, e possivelmente excessos para elemento Mg. A ordem de limitação nutricional foi K > P > Ca > Fe > N > S > B > Zn > Cu
ISSN:0100-2945
1806-9967
0100-2945
DOI:10.1590/0100-29452017728