Titlebook: Optimization of Plant Nutrition; Refereed papers from M. A. C. Fragoso,M. L. Beusichem,A. Houwers Book 1993 Springer Science+Business Media

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P. D. Castellane,R. K. Fujimura,J. A. C. de Araujo,M. E. Ferreira■■■

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o increase food and where it is most needed. Major problems of international concern for the scientific community are the availability in soil media of macro and micro nutrients and the efficiency of nutrient uptake by plant roots, the interactions between nutrients and other factors, the distributi

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Comparison of techniques for nitrogen analysis in potato cropsy rate of ca. 98% organic-N and variable recovery of inorganic-N. Dumas measures both organic- and inorganic-N with a recovery rate of 100%. The suitability of Kjeldahl as an analytical technique must be questioned when NIR methods are available which will give accurate [N] values quickly, safely and cheaply.

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Determination of copper in different chloroplast preparationsurnace of the atomic absorption spectrophotometer. Good agreement was obtained between our results and those obtained by a classical dry combustion method. Reproducibility was better than 5% when expressed as relative standard deviation.

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Relationship between aboveground dry weight and N, P and K concentrations in grassland species: A guessary to determine the nutrient status of these two cations in permanent grasslands. Despite big differences in production, the equations of the nine grass species are very similar for all these nutrients (N, P, K and Mg). The parameters of these equations given here can be used as a guide to determine a satisfactory nutrition.

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The use as fertilizer of combined primary/secondary pulp-mill sludge larger than 50 t ha. led to a significant yield reduction. Concerning soil characteristics, significant differences on pH, organic matter and exchangeable sodium percentage values were detected as well as on Ca/Mg ratio.

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