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Objetivou-se caracterizar os sintomas visuais das deficiencias de nitrogenio e potassio nas plantas de gergelim, cultivar G3, cultivadas em solucao nutritiva com a omissao destes elementos. O experimento foi conduzido em casa de vegetacao do Departamento de Engenharia Agricola da Universidade Federal de Campina Grande, utilizando a tecnica denominada diagnose por subtracao. O delineamento experimental utilizado foi o inteiramente casualizado com tres tratamentos e tres repeticoes: T1- solucao nutritiva completa (controle); T2- solucao nutritiva com omissao do Nitrogenio (-N) e T3- solucao nutritiva com omissao do Potassio (-K). Foram realizadas as avaliacoes de crescimento (30; 45; 60; 75 DAS), o indice de clorofila (60DAS) e a materia seca (75 DAS). Os sintomas das deficiencias visuais foram registrados. As omissoes de N e K foram limitantes para o desenvolvimento da cultura do gergelim afetando a sua estrutura fisica de crescimento bem como aparecimento de sintomas visuais caracteristicos das deficiencias nutricionais de cada nutriente. Diagnosis by subtraction for deficiency of nitrogen and potassium in sesame frown with nutrient solution Abstract: This study aimed to characterize visual symptoms of nitrogen and potassium deficiencies in sesame plants, cv. G3, cultivated in nutrient solution with the omission of these elements. The experiment was carried out under greenhouse conditions at the Agricultural Engineering Department of the Federal University of Campina Grande, using the techniques of diagnosis through subtraction.The experimental design was completely randomized with three treatments and three repetitions: T1- complete nutrient solution (control); T2- nutrient solution omitting the nitrogen (-N) and T3- nutrient solution omitting the potassium (-K). During the experiment were carried out growth assessments (30; 45; 60; 75 DAS), chlorophyll index (60DAS) and dry matter (75 DAS). Symptoms of visual deficiencies were recorded. The omission of N and K were limiting for the development of sesame culture affecting the physical structure and growth characteristic showing visual symptoms of nutrient deficiencies of each nutrient.

Diagnose por subtração para deficiências de nitrogênio e potássio em gergelim cultivado com solução nutritiva