1. Plant root excretions in relation to the rhizosphere effect

   • A. D. Rovira

   OriginalPaper Pages: 209 - 217

2. The effects of various soil treatments on the occurrence of marsh spot in peas and on manganese uptake and yield of oats and timothy

   • S. G. Heintze

   OriginalPaper Pages: 218 - 236

3. On the effect of ferrous sulphate on the available manganese in the soil and the uptake of manganese by the plant II

   • Else Boken

   OriginalPaper Pages: 237 - 252

4. Studies on the decomposition of amino acids in soils

   • D. J. Greenwood
   • H. Lees

   OriginalPaper Pages: 253 - 268

5. Untersuchungen mit Bodenverbesserungsmitteln

   • F. Scheffer
   • A. Kloke

   OriginalPaper Pages: 269 - 280

6. Production and prevention of frenching of tobacco grown in the greenhouse

   • Robert A. Steinberg

   OriginalPaper Pages: 281 - 289

7. The effect of levels of calcium sulphate on the yield and composition of a grass and clover pasture

   • T. W. Walker
   • A. F. R. Adams
   • H. D. Orchiston

   OriginalPaper Pages: 290 - 300