Plant and Soil 154: 313-316, 1993. Contents Volume 154 (1993) Selected papers from the PROCEEDINGS OF THE EIGHT INTERNATIONIAL SYMPOSIUM FOR THE OPTIMIZATION OF PLANT NUTRITION Determination of lead in white lupin by anodic stripping voltammetry M.M.P.M. Neto, A. De Varennes Determination of copper in different chloroplast preparations J.B. Arellano, M. Baron, A. Chueca, M. Lachica Potassium supplying capacity of northeastern Portuguese soils E.A.C. Portela Nutritional disorders between potassium, magnesium, calcium, and phosphorus in soil S.T. Jakobsen Long-term effects of gypsiferous coal combustion ash applied at disposal levels on soil chemical properties R.F. Korcak, W.D. Kemper DRIS evaluation of persimmon (Diospyrus kaki L.) |. Klein, L. Fanberstein, L. Viner A multivariate diagnosis approach applied to celery N. Tremblay, P. Auclair, L.-E. Parent, A. Gosselin Design and analysis of mixture systems: Applications in hydroponic, plant nutrition research E. Schrevens, J. Cornell Genotypic variability for physiological efficiency index of nitrogen in oats D. Isfan Mapping of genes for copper efficiency in rye and the relationship between copper and iron efficiency R. Schlegel, R. Kynast, T. Schwarzacher, V. Rômheld, A. Walter Differences in uptake kinetics of ammonium and nitrate in legumes and cereals T.P. Rao, O. Ito, R. Matsunga Growth analysis of soil-grown spinach plants at different N-regimes E. Smolders, J. Buysse, R. Merckx Effects of fertilization levels in two farming systems on senescence and nutrient contents in potato leaves A. Berchtold, J.-M. Besson, U. Feller 314 Nitrogen uptake in relation to water availability in wheat J.P. De M.E. Abreu, |. Flores, F.M.G. De Abreu, M.V. Madeira Effect of iron chlorosis on mineral nutrition and lipid composition of thylakoid biomembrane in Prunus persica (L.) Bastch. E. Monge, C. Pérez, A. Pequerul, P. Madero, J. Val Evaluation of structural and physiological plant characteristics in relation to the distribu- tion of cadmium in maize inbred lines P.J. Florijn, J.A. Nelemans, M.L. Van Beusichem Effect of withdrawal of phosphorus on nitrate assimilation and PEP carboxylase activity in tomato D.J. Pilbeam, |. Cakmak, H. Marschner, E.A. Kirkby Hydraulic properties of sphagnum peat moss and tuff (scoria) and their potential effects on water availability F.F. Da Silva, R. Wallach, Y. Chen Effects of environment on the uptake and distribution of calcium in tomato and on the incidence of blossom-end rot P. Adams, L.C. Ho Interaction of salinity and enhanced ammonium and potassium nutrition in wheat A. Shaviv, J. Hagin A method to optimize N-application in relation to soil supply of N, and yield of potato D.K.L. MacKerron, M.W. Young, H.V. Davies * Research articles Acetobacter diazotrophicus, an indoleacetic acid producing bacterium isolated from sugarcane cultivars of Mexico L.E. Fuentes-Ramirez, T. Jimenez-Salgado, |.R. Abarca-Ocampo, J. Caballero-Mellado Combined use of colorimetric and microelectrode methods for evaluating rhizosphere pH H.T. Gollany, T.E. Schumacher identification of an index tissue to predict zinc status of wheat Y.P. Dang, D.G. Edwards, R.C. Dalal, K.G. Tiller Nutrient fluxes in the shifting cultivation system of south-west Côte d'ivoire, I: Dry matter production, nutrient contents and nutrient release after slash and burn for two fallow vegetations H. van Reuler, B.H. Janssen Nutrient fluxes in the shifting cultivation system of south-west Côte d'ivoire, Il: Short- term and long-term effects of burning on yield and nutrient uptake of food crops H. van Reuler, B.H. Janssen The effect of phytase on the availability of P from myo-inositol hexaphosphate (phytate) for maize roots G.R. Findenegg, J.A. Nelemans Distribution of sulphur forms in soils from beech and spruce forests of Mont Lozère (France) C. Vannier, J.-F. Didon-Lescot, F. Lelong, B. Guillet Enhancement of symbiotic nitrogen fixation by vitamin-secreting fluorescent Pseudomonas M. Deryto, A. Skorupska Soybean response to nodulation by rhizobitoxine-producing bradyrhizobia as in- fluenced by nitrate application G.B. Teaney Ill, J.J. Fuhrmann Daily transpiration of field soybeans as related to hydraulic conductance, root distribu- tion, soil potential and midday leaf potential N. Brisson, A. Olioso, P. Clastre Yields of Norway spruce (Picea abies (L.) Karst.) in two consecutive rotations in south- western Sweden H. Eriksson, U. Johansson Silicon amelioration of aluminium toxicity in teosinte (Zea mays L. spp. mexicana) J. Barcelo, P. Guevara, Ch. Poschenrieder Responses of some genetically diverse lines of chick pea (Cicer arietinum L.) to salt M. Ashraf, A. Waheed Estimates of the residual nitrogen benefit of groundnut to maize in Northeast Thailand J.F. McDonagh, B. Toomsan, V. Limpinuntana, K.E. Giller Effects of Bradyrhizobium strain and host genotype, nodule dry weight and leaf area on groundnut (Arachis hypogaea L. ssp. fastigiata) yield D. van Rossum, A. Muyotcha, H.W. van Verseveld, A.H. Stouthamer, F.C. Boogerd The influence of NO3 and NHj nutrition on the carbon and nitrogen partitioning charac- teristics of wheat (Triticum aestivum L.) and maize (Zea mays L.) plants M.D. Cramer, O.A.M. Lewis The influence of organic soil amendments on sulfate adsorption and sulfur availability in a Brazilian Oxisol P.P. Motavalli, J.M. Duxbury, D.M.G. de Souza Instructions to Authors (1993) Contents Volume 154 Author Index