PLANT AND SOIL Contents Volume 288 Nos. 1-2 October 2006 Performance of Bromus tectorum L. in relation to soil properties, water additions, and chemical amendments in calcareous soils of southeastern Utah, USA M.E. Miller, J. Belnap, S.W. Beatty and R.L. Reynolds Effects of water additions, chemical amendments, and plants on in situ measures of nutrient bioavailability in calcareous soils of southeastern Utah, USA M.E. Miller, J. Belnap, S.W. Beatty and B.L. Webb Microbial control of plant-parasitic nematodes: a five-party interaction L.Q. Dong and K.Q. Zhang Allelochemicals released by rice roots and residues in soil C.H. Kong, H.B. Li, F. Hu, X. H. Xu and P. Wang Drainage and nitrate leaching in a crop rotation under different N-fertilizer strategies: application of capacitance probes L.M. Arregui and M. Quemada Burial of canopy-stored seeds in the annual psammophyte Agriophyllum squarrosum Mog. (Chenopodiaceae) and its ecological significance Z. Liu, Q. Yan, C.C. Baskin and J. Ma The invasive plant species Centaurea maculosa alters arbuscular mycorrhizal fungal communities in the field D.L. Mummey and M.C. Rillig Nitrate influx kinetic parameters of five potato cultivars during vegetative growth M. Sharifi and B.J. Zebarth A bioluminescence assay to detect nitrification inhibitors released from plant roots: a case study with Brachiaria humidicola G.V. Subbarao, T. Ishikawa, O. Ito, K. Nakahara, H.Y. Wang and W.L. Berry 101-112 Site assessment of a woody crop where a shallow hardpan soil iayer constrained plant growth G. Pracilio, K.R.J. Smettem, D. Bennett, R.J. Harper and M.L. Adams 113-125 Carboxylate release of wheat, canola and 11 grain legume species as affected by phosphorus status S.J. Pearse, E.J. Veneklaas, G.R. Cawthray, M.D.A. Bolland and H. Lambers 127-139 Changes in soil phosphorus fractions in a calcareous paddy soil under intensive rice cropping Q. Zhang, G.H. Wang, Y.K. Feng, Q.Z. Sun, C. Witt and A. Dobermann 141-154 Fine root architecture, morphology, and biomass of different branch orders of two Chinese temperate tree species Z. Wang, D. Guo, X. Wang, J. Gu and L. Mei 155-171 Responses of Bradford-reactive soil protein to experimental nitrogen addition in three forest communities in northern lower Michigan R.K. Antibus, C. Lauber, R.L. Sinsabaugh and D.R. Zak 173-187 Soil hydraulic manipulation and organic amendment for the enhancement of selenium volatilization in a soil-pickleweed system B. Shrestha, S. Lipe, K.A. Johnson, T.Q. Zhang, W. Retzlaff and Z.-Q. Lin 189-196 Nutrient fluxes via litterfall and leaf litter decomposition vary across a gradient of soil nutrient supply in a lowland tropical rain forest D.H. Dent, R. Bagchi, D. Robinson, N. Majalap-Lee and D.F.R.P. Burslem 197-215 Effects of forest conversion into grassland on soil aggregate structure and carbon storage in Panama: evidence from soil carbon fractionation and stable isotopes L. Schwendenmann and E. Pendall 217-232 Effect of deep and shallow root systems on the dynamics of soil inorganic N during 3-year crop rotations K. Thorup-Kristensen 233-248 How do climate warming and piant species richness affect water use in experimental grasslands? H.J. De Boeck, C.M.H.M. Lemmens, H. Bossuyt, S. Malchair, M. Carnol, R. Merckx, |. Nijs and R. Ceulemans 249-261 Mobilization of soil phosphorus during passage through the gut of larvae of Pachnoda ephippiata (Coleoptera: Scarabaeidae) X. Li, R. Ji, A. Schaffer and A. Brune 263-270 Exotic plant communities shift water-use timing in a shrub-steppe ecosystem A. Kulmatiski, K.H. Beard and J.M. Stark 271-284 Soil enzyme activities and organic matter composition in a turfgrass chronosequence W. Shi, E. Dell, D. Bowman and K. lyyemperumal 285-296 Amino acid uptake in deciduous and coniferous taiga ecosystems K. Kielland, J. McFarland and K. Olson 297-307 The use of transgenic canola (Brassica napus) and plant growth-promoting bacteria to enhance plant biomass at a nickel-contaminated field site A.J. Farweli, S. Vesely, V. Nero, H. Rodriguez, S. Shah, D.G. Dixon and B.R. Glick 309-318 Microbial Biomass, N Mineralization and Nitrification, Enzyme Activities, and Microbial Community Diversity in Tea Orchard Soils D. Xue, H. Yao and C. Huang 319-331 Distinctive effects of cadmium on glucosinolate profiles in Cd hyperaccumulator Thlaspi praecox and non-hyperaccumulator Thlaspi arvense R. Tolra, P. Pongrac, C. Poschenrieder, K. Vogel-Mikus, M. Regvar and J. Barcelo 333-341 Genetic diversity of indigenous tropical fast-growing rhizobia isolated from soybean nodules M. Hungria, L.M.O. Chueire, M. Megias, Y. Lamrabet, A. Probanza, F.J. Guttierrez-Mañero and R.J. Campo 343-356 Two classification methods for developing and interpreting productivity zones using site properties N. Martin, G. Bollero, N.R. Kitchen, A.N. Kravchenko, K. Sudduth, W.J. Wiebold and D. Bullock 357-371 Aluminum-inhibited root growth of rice seedlings is mediated through putrescine accumulation J.-W. Wang and C.H. Kao 373-381 Available online www.springerlink.com Cover Photo: Newly fallen white oak leaves mix with the forest floor in white oak-black oak forest study sites in northern lower Michigan. Plant and Soil Vol 288, pp. 173-187.