Absorção de nutrientes e resposta à adubação em linhagens de tomateiro

Horizontes Antropológicos 12/2009; 27(4). DOI: 10.1590/S0102-05362009000400016


Vinte e nove linhagens de tomateiro rasteiro foram avaliadas quanto à eficiência de absorção de nutrientes e resposta à adubação, em dois ensaios, no ano de 2006, na Embrapa Hortaliças. No primeiro ensaio aplicou-se 1/3 da dosagem de fertilizante utilizada no segundo. O delineamento experimental foi inteiramente casualizado, com três repetições. As linhagens foram classificadas quanto à eficiência na absorção de nutrientes e reposta à adubação baseando-se nos incrementos de índice DRIS e nos incrementos de produtividade. Os valores críticos para eficiência na absorção e resposta à adubação foram as médias de incremento de índice DRIS e produtividade, respectivamente. As linhagens diferenciaram-se quanto à eficiência na absorção dos nutrientes e quanto à resposta à adubação. Foram consideradas responsivas à adubação e eficientes na absorção de nutrientes as linhagens 03, 04, 05, 09 e 22, para o N; 03, 04, 09, 13, 15 e 29, para o P; 03, 05, 10, 21, 22, 25 e 27, para o K; 05, 10, 21, 22, 25, 27 e 29, para o Ca; 04, 13, 15, 27 e 29, para o S e B; e 03, 05, 09, 10 e 27, para o Cu. As linhagens com os melhores desempenhos foram a 27, na absorção dos nutrientes, e 03, 04, 05 e 29, na responsividade à adubação.

Full-text preview

Available from:
  • Source
    • " Journal of Plant Studies Vol. 4, No. 2; 2015 60 Prof Sebastiao Oliveira, (University of Brasilia – Brazil) (Lana et al., 2010; Oliveira et al., 2009 "

    Full-text · Article · Mar 2015
  • [Show abstract] [Hide abstract]
    ABSTRACT: Coriander is a oleraceous crop whose fresh mass is rich in vitamins, being widely used in a number of dishes. The seeds are condiments and the dry fruits are useful in pharmaceutical and food industry. The present study aimed to characterize the visual symptoms of deficiency of macronutrients and boron, as well as assess the effects of omitting these nutrients on the coriander plant growth, cv. Verdao, cultivated in greenhouse in Campos dos Goytacazes, Rio de Janeiro state, Brazil. The experimental design was randomized blocks with eight treatments: complete, and omission of nitrogen, phosphorus, potassium, calcium, magnesium, sulfur and boron, with four replications, the experimental unit consisting of 14-liter pots with nutrient solution and four plants per pot. The level of macronutrients and boron in dry mass of roots and leaves, the visual symptoms of deficiency and the dry mass production of roots, leaves, stem and total were assessed. Visual symptoms were observed until 24 days after the beginning of the applications. The nutritional deficiency symptoms arose in the following order: Ca< B< N< S< Mg< P. The level obtained in the roots and leaves when one nutrient was omitted was lower than those found in the full treatment, showing that the described symptoms were caused by the absence of that specific nutrient. Visual symptoms were not observed in potassium-deficient treatment during the period this experiment was carried out. A reduction in dry mass in all deficient treatments was observed when compared to the full treatment.
    No preview · Article · Jan 2014 · Horticultura Brasileira
  • [Show abstract] [Hide abstract]
    ABSTRACT: Plant nutrition is one of the most important factors for successful cultivation of tomatoes, especially in the greenhouse, and Diagnosis and Recommendation Integrated System (DRIS) is an alternative for fertilizer recommendation. This study aimed to establish DRIS norms for tomato plants growing in greenhouse located at Norte Pioneiro do Paraná region (Paraná State, Brazil). Chemical analysis of nutrients on leaves (N, P, K, Ca, Mg, S, B, Cu, Fe, Mn and Zn) of hybrid tomatoes (Colibri, Pizzadoro, Debora Max and Granadero), and respective yields of 61 growing areas in greenhouses (24.4 ha) were used. Samples were collected during April to December 2010, in five cities. Five levels of tomato yield (6, 7, 8, 9, and 10 kg plant-1) were used for establishing a database with all binary relationships among all the nutrients studied in all samples. The average, standard deviation and variance for each concentration of nutrient were calculated and it was done for relationship among nutrients, also, in each sub-population. We used 55 relationships which showed the highest ratio in the variance between sub-populations. The nutritional content of each nutrient and the nutrient balance index (IBN) of each production level were calculated. The best correlation between IBN and tomato yield was obtained with 8 kg plant-1 of tomato and this value was defined as an index to be used for DRIS. The nutritional diagnosis carried out in crops with yields below 6 kg plant-1 showed relative deficiencies of K and B and relative excess of Mg.
    No preview · Article · Jun 2014 · Horticultura Brasileira