In the second experiment the hybrid Eurocross was used to reduce the experimental variation found previously with the Ailsa Craig variety. The plants were grown in the glass incubators during the winter months and for practical reasons it was not possible to set up all the treatments at one time. Hence the experiment was divided into two sectio A and B. Level 2 was replicated in both series and there was a difference in planting time of I week. Again there was a marked difference between the mycorrhizal and control treatments over most of the phosphate levels particularly the lower ones(Table.The infected plants developed larger and more leaves and the numbers of internodes were greater than those found on the control plants(Plate I8a). The control plants at the lower levels of bone-meal showed marked symptoms of phosphate deficiency as seen in the lea colour and premature drop of cotyledons. At all levels the leaves and roots of mycorrhizal