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take This may result in an increase in element uptake, and consequently in its accumulation in the different organs of the test plants. Therefore, it can be said that the application of phytohormones may counteract to some extent the adverse effects of at least moderate drought stress. REFERENCES

ADJEI-TWUM, D. C., SPL1TIS'I'OESSER,W. E. : The effect of soil water regimes on leaf water potential. growth and development of soybeans.- Physiol. Plant. 38 : 131-137, 1976. AHMED, A. M., HEIKAL, M. M., 7_aDAN,M. A. : Effect of salir treatments on growth and some leguminous plants. - Can. J. Plant Sci. 60 : 713-720, 1980. Gr~ONmM, M. F., EL-CHAR.ABLY,G. S., AaD-ELgAZEK, M., EL-REWAINY,H. M. : Effect of soil moisture on K uptake and growth of alfalfa and maize plants. - Assiut J. agr. Sci. 15 : 3-12, 1984. HASANEIN,A. M. : Growth and chemical composition of some plants as influenced by drought stress. - M. Sc. Thesis, Assiut University, Assiut 1984. HSIAO, T. C. : Plant responses to water stress. - Anna. Rev. Plant Physiol. 24 : 219-270, 1973. KARLEN, D. L., ELLIS, R., WHITNEY, D. A. Jr., GRtrt~rEs, D. L. : Influence of soil moisture and plant cultivar on cation uptake by wheat with respect to Grass tetany. - Agron. J. 70 : 918-921, 1978. LAWLOR, D. W., JOHNSTON,A. F., LEC_,G,B. J., PAKINSON,K. J. : Growth of'spring barley under drought : crop development, photosynthesis, dry matter accumulaiion and nutrient content. - J. agr. Sci. 96 : 167-186, 1981. Scow, H. D., BREWER, D. W.: Translocation of nutrient in soybean. - Soil Sci. Soc. Amer. J. 44 9 566-569, 1980. WA'rSON, D. J., WA'rSON,M. A. : Studies on potatoes agronomy. 1-Effect of variety seed size and spacing on growth, development and yield. - J. agr. Sci. 66 : 241, 1953. Wrt.LI^MS, V., TWn~E, S. : Flame photometric method for sodium, potassium and calcium. - In : PAECH, K., TRACEY,M. V. (ed.) : Modern Methods of Plant Analysis. Vol. V. Springer-Verlag, Berlin 1960. WooDs, J. T., MF-LLON,M. G. : Chlorostannous-reduced molybdophosphoric blue color in sulfuric acid system. - In : JACXSON,M. L. (ed.) : Soil Chemical Analysis. Pp. 141-144. Prentice-Hall International, London 195&

BOOK REVIEW BLA~-J, A., KO~IK, M. : FY'rOMASAAKO CHEMICKASUROVINA. [PLANT BIOMASSAS CHEMICALRAW MAmmAL.] -- Veda, Bratislava 1985. 402 pp., K~s 57. [In Slovak.] Increasing demand for energy and raw materials and decreasing reserves of fosil fuels (coal, oil) resulted in looking for the new and renewable resources. One of them is organic matter of photosynthesizing plants - plant biomass. From the yearly produced 180.109 tons of plant biomass approximately only 1 % is used in the form of fibre, wood or fuel and further 1 % as food, fodder or forage. This portion is very small and may be enhanced by cultivation of more productive plant genotypes in fields, pastures and forests and by more effective exploitation. The present state of plant biomass emploiment is reviewed in the Introduction. The matter is divided into eight chapters : (2) [Plant raw materials- plant biomass] ; (3) [Reactions of saccharides degradation] ; (4) [Reactions of lipids degradation] ; (5) [Chemical modifications of polysaccharides and lignin] ; (6) [Hydrolytic and following processes of plant biomass processing] ; (7) [Energetic utilization of plant biomass] ; (8) [Lignochemie processes], and (9) [Complex processing of tree matter]. The concluding chapter is devoted to the possibilities of increasing plant biomass production and to the tasks of chemical and biochemical investigations of plant biomass. The text of each chapter is complemented with a list of references. The book is equipped with Subject and Author indexes. JARMILASOLAROVA(Praha)