1. Effect of submergence on availability of certain plant nutrients in three Ultisol catenas

   • R. R. Weil
   • Sh. Sh. Holah

   OriginalPaper Pages: 147 - 157

2. Interaction effects of insecticide combinations on the growth ofScenedesmus bijugatus andSynechococcus elongatus

   • M. Megharaj
   • K. Venkateswarlu
   • A. S. Rao

   OriginalPaper Pages: 159 - 163

3. Woody species and nutrient accumulation during the fallow period of milpa farming in Belize, C.A.

   • D. Brubacher
   • J. T. Arnason
   • J. Lambert

   OriginalPaper Pages: 165 - 172

4. Effect of aluminium on the mineral nutrition of rice

   • Tang van Hai
   • Truong Thi Nga
   • Henri Laudelout

   OriginalPaper Pages: 173 - 185

5. A simulation model for the fate of pesticide residues in a field soil

   • Z. Shaaban
   • A. M. Elprince

   OriginalPaper Pages: 187 - 195

6. Salinity and flooding level as determinants of soil solution composition and nutrient content inPanicum hemitomum

   • T. C. Feijtel
   • P. A. Moore Jr.
   • I. Mendelssohn

   OriginalPaper Pages: 197 - 204

7. The response of rice to the growth and nitrogen fixation inAzolla caroliniana andAzolla pinnata at varying rates of phosphate fertilization

   • D. P. Singh
   • P. K. Singh

   OriginalPaper Pages: 205 - 209

8. Comparison of Bray I and P_i tests for evaluating plant-available phosphorus from soils treated with different partially acidulated phosphate rocks

   • R. G. Menon
   • S. H. Chien
   • L. L. Hammond

   OriginalPaper Pages: 211 - 216

9. Mobilization of iron and other micronutrient cations from a calcareous soil by plant-borne, microbial, and synthetic metal chelators

   • M. Treeby
   • H. Marschner
   • V. Römheld

   OriginalPaper Pages: 217 - 226

10. Effect of nitrogen fertilization and cropping system of the reference crop on estimation of N₂ fixation by vetch using¹⁵N methodology

    • I. Papastylianou
    • S. K. A. Danso

    OriginalPaper Pages: 227 - 233

11. Occurrence ofAzospirillum spp. in coconut-based farming systems

    • S. K. Ghai
    • George V. Thomas

    OriginalPaper Pages: 235 - 241

12. Evaluation of¹⁵N methods to measure nitrogen transfer from alfalfa to companion timothy

    • T. C. Ta
    • M. A. Faris
    • F. D. H. Macdowall

    OriginalPaper Pages: 243 - 247

13. Estimation of nitrogen fixation and transfer from alfalfa to associated grasses in mixed swards under field conditions

    • H. A. Burity
    • T. C. Ta
    • B. E. Coulman

    OriginalPaper Pages: 249 - 255

14. Aluminium and manganese and their relation to calcium in soil solution and needles in three Norway spruce (Picea abies, L. Karst.) stands of Upper Austria

    • M. Kazda
    • L. Zvacek

    OriginalPaper Pages: 257 - 267

15. Toxin production by a rhizobacterialPseudomonas sp. that inhibits wheat root growth

    • H. Bolton Jr.
    • L. F. Elliott

    OriginalPaper Pages: 269 - 278

16. Characterization of a toxin produced by a rhizobacterialPseudomonas sp. that inhibits wheat growth

    • H. Bolton Jr.
    • L. F. Elliott
    • J. K. Fredrickson

    OriginalPaper Pages: 279 - 287

17. Influence of the ion-balance in the growth medium on the yield and alkaloid content ofDatura stramonium L.

    • K. Demeyer
    • R. Dejaegere

    OriginalPaper Pages: 289 - 294

18. The fate of nitrogen under maize and pasture cultivated on an alfisol in the western Llanos savannas, Venezuela

    • J. M. Hétier
    • G. Sarmiento
    • J. M. Thiéry

    OriginalPaper Pages: 295 - 302