Table Of Content

Plant and Soil 153: 309-312, 1993. Contents Volume 153 (1993) Research articles A method for counting roots observed in minirhizotrons and their theoretical conver- sion to root length density S.T. Buckland, C.D. Campbell, L.A. Mackie-Dawon, G.W. Horgan, E.I. Duff Does hydraulic lift exist in shallow-rooted species? A quantitative examination with a half-shrub Gutierrezia sarothrae C. Wan, R.E. Sosebee, B.L. McMichael Growth and ion accumulation of two rapid-cycling Brassica species differing in sait tolerance T. He, G.R. Cramer Plant symbiotic mutants as a tool to analyse nitrogen nutrition and yield relationship in field-grown peas (Pisum sativum L.) M. Sagan, B. Ney, G. Duc Re-sorption of organic compounds by roots of Zea mays L. and its consequences in the rhizosphere, Il: Experimental and model evidence for simultaneous exudation and re- sorption of soluble C compounds D.L. Jones, P.R. Darrah Low molecular weight humic substances stimulate H*-ATPase activity of plasma membrane vesicles isolated from oat (Avena sativa L.) roots Z. Varanini, R. Pinton, M.G. de Biasi, S. Astolfi, A. Maggioni Photoperiod and root-zone temperature: Interacting effects on growth and mineral nutrients of maize A. Mozafar, P. Schreiber, J.J. Oertli Cadmium distribution in maize inbred lines: Effects of pH and level of Cd supply P.J. Florijn, M.L. van Beusichem Frankia in the rhizosphere of nonhost plants: A comparison with root-associated N2-fixing Enterobacter, Klebsiella and Pseudomonas R. Rönkkö, A. Smolander, E.-L. Nurmiaho-Lassila, K. Haahtela Production of vitamins by Azospirillum brasilense in chemically-defined media B. Rodelas, V. Salmerön, M.V. Martinez-Toledo, J. Gonzälez-Löpez Effects of tree clumps on soil characteristics in a humid savanna of West Africa (Lamto, Côte d’Ivoire) P. Mordelet, L. Abbadie, J.-C. Menaut 310 Reversibility of phosphorus sorption by ferruginous nodules H. Tiessen, M.K. Abekoe, |.H. Salcedo, E. Owusu-Bennoah Maize nodal root ramification: Absence of dormant primorida, root classification using histological parameters and consequences on sap conduction M.-O. Jordan, J. Harada, C. Bruchou, K. Yamazaki Short communications Effect of abscisic acid application on root isoflavonoid concentration and nodulation of wild-type and nodulation-mutant soybean plants M.-J. Cho, J.E. Harper Does carbon isotope discrimination correlate with biological nitrogen fixation J.D. Knight, F. Verhees, C. van Kessel, A.E. Slinkard * Research articles The ability of 16 ectomycorrhizal fungi to increase growth and phosphorus uptake of Eucalyptus globulus and E. diversicolor F. Muell T.l. Burgess, N. Malajczuk, T.S. Grove Effects of plant growth regulators on acetylene-reducing associations between Azospirillum brasilense and wheat S. Sriskandarajah, I.R. Kennedy, D. Yu, Y.T. Tchan Mulching effect of plant residues with chemically contrasting compositions on maize growth and nutrients accumulation G. Tian, B.T. Kang, L. Brussaard Leaf responses to soil water deficits: Comparative sensitivity of leaf expansion rate and leaf conductance in field-grown sunflower Helianthus annuus L.) V.O. Sadras, F.J. Villalobos, E. Fereres, D.W. Wolfe Using a chelate-buffered nutrient solution to establish the critical solution activity of MN2* required by barley (Hordeum vulgare L.) M.J. Webb, W.A. Norvell, R.M. Welch, R.D. Graham Interaction between zinc nutritional status of cereals and Rhizoctonia root rot severity, I: Field observations P. Thongbai, R.J. Hannam, R.D. Graham, M.J. Webb Interaction between zinc nutritional status of cereals and Rhizoctonia root rot severity, ll: Effect of Zn on disease severity of wheat under controlled conditions P. Thongbai, R.D. Graham, S.M. Neate, M.J. Webb Effects of the root-lesion nematode Pratylenchus vulnus and the vesicular-arbuscular mycorrhizal fungus Glomus mosseae on the growth of three plum rootstocks A. Camprubi, J. Pinochet, C. Calvet, V. Estaun Nitrogen uptake in needles of Scots pine (Pinus sylvestris L.) when exposed to gaseous ammonia and ammonium fertilizer in the soil M. Pérez-Soba, L.J.M. van der Eerden Sensitivity to H- and Al ions limiting growth and distribution of the woodland grass Bromus benekenii M.E. Andersson, J. Brunet lron-deficiency chlorosis in Scots pine growing on acid soils H.F.G. van Dijk, H.F. Bienfait Variation in the salinity tolerance of strawberry clover (Trifolium fragiferum L.) M.D. Rumbaugh, B.M. Pendery, D.W. James Using a fine root extraction device to quantify small diameter corn roots (> 0.025 mm) in field soils E. Pallant, R.A. Holmgren, G.E. Schuler, K.L. Mccracken, B. Drbal Lithium metaborate fusion for silicon, calcium, magnesium, and potassium analysis of wild rice M.L. Meyer, P.R. Bloom Grain protein and grain yield of tritordeum in comparison to wheat and triticale M. Gallardo, E. Fereres Natural abundance of 15N in tropical plants with emphasis on tree legumes T. Yoneyama, T. Muraoka, T. Murakami, N. Boonkerd Instructions to authors (1993) Contents volume 153 Author index