Kultursubstrate für den Gartenbau, besonders in Deutschland: — Ein kritischer Überblick F. Penningsfeld ReviewPaper Pages: 269 - 281
Acidification and alkalinization of soils N. van BreemenJ. MulderC. T. Driscoll OriginalPaper Pages: 283 - 308
TheParasponia parviflora—Rhizobium symbiosis. Host specificity, growth and nitrogen fixation under various conditions J. H. Becking OriginalPaper Pages: 309 - 342
TheParasponia parviflora — Rhizobium symbiosis. Isotopic nitrogen fixation, hydrogen evolution and nitrogen-fixation efficiency, and oxygen relations J. H. Becking OriginalPaper Pages: 343 - 360
An evaluation of plant-borne factors promoting the solubilization of alkaline rock phosphates T. BekeleB. J. CinoA. Van Diest OriginalPaper Pages: 361 - 378
Agronomical and physiological aspects of the role of nitrogen in yield formation of cereals J. H. J. SpiertzN. M. De Vos OriginalPaper Pages: 379 - 391
Uptake of heavy metals by crops in relation to their concentration in the soil solution R. G. GerritseW. Van DrielB. Van Luit OriginalPaper Pages: 393 - 404
Effect of a pesticide, pentachlorophenol (PCP) on soil microflora Kyo Sato OriginalPaper Pages: 417 - 426
The absorption, distribution and concentration of copper in white clover grown on a range of soils S. C. JarvisD. C. Whitehead OriginalPaper Pages: 427 - 434
Changes during development in the free amino acid constituents of fababean (Vicia faba L.) plants D. G. Hill-CottinghamJ. V. Purves OriginalPaper Pages: 435 - 442
Changes in the water-permeability of roots of some trees during drought stress and recovery, as related to problems of growth in urban environment L. K. WiersumK. Harmanny OriginalPaper Pages: 443 - 448
Host-genetic control of nitrogen fixation in the legume-Rhizobium symbiosis: complication in the genetic analysis due to maternal effects T. A. LieP. C. J. M. Timmermans OriginalPaper Pages: 449 - 453
Effect of soil salinity on the electro-chemical and chemical kinetics of some plant nutrients in submerged soils F. N. MahrousD. S. MikkelsenA. A. Hafez OriginalPaper Pages: 455 - 472
Agroclimatic characterization of the humid tropics in relation to the cumulative soil-water balance L. R. Oldeman Short Communication Pages: 475 - 476