• Ali, B. (1969). Cytochcmical and autoradiographic studies of mycorrhizal roots of Nardus. Archives Of Microbiology 68, 236245.
  • Anderson, E. L, Milner, P. D. & Kunishi, H. M. (1987). Maize root length density, and mycorrhizal infection as influenced by tillage and soil phosphorus. Journal of Plant Nutrition 10, 13491351.
  • Azcon, R. & Ocampo, J. A. (1981). Factors affecting the vesicular-arbuscular infection and mycorrhizal dependency of thirteen wheat cultivars. New Phytologist 87, 677685.
  • Boatman, N., Paget, D., Hayman, U.S. & Mosse, B. (1978). Effects of systemic fungicides on vesicular-arbuscular mycorrhizal infection and plant phosphate uptake. Transactions of the British Mycological Society, 70, 443450.
  • Brundrett, M. C, Piche, Y. & Peterson, R. L. (1984). A new method for observing the morphology of vesicular-arbuseular mycorrhizae. Canadian Journal of Botany 62, 21282134.
  • Clarke, C. & Mosse, B. (1981). Plant growth responses to vesicular-arbuseular mycorrhiza. XII. Field inoculation responses of barley at two soil P levels. New Phytologist 87, 695703.
  • Cooper, K. M. & Tinker, P. B. (1978). Translocation and transfer of nutrients in vesicular arbuscular mycorrhizas. II. Uptake and translocation of phosphorus, zinc and sulphur. New Phytologist 81, 4352.
  • Drew, M. C. & Saker, L. R. (1980). Direct drilling and ploughing: their effects on the distribution of extractable phosphorus and potassium, and of roots, in the upper horizons of two clay soils under winter wheat and spring barley. Journal of Agricultural Science (Camb.) 94, 411423.
  • Geary, R. C (1936). Moments of the ratio of the mean deviation to the standard deviation for normal samples. Biometrika 25, 295305.
  • Gilmore, A. E. (1971). The influence of endomycorrhizae on the growth of peach seedlings. Journal of the American Society of Horticultural Science 96, 3538.
  • Giovanetti, M. & Hepper, C. M. (1985). Vesicular arbuscular mycorrhizal infection in Hedysarium coronarium and Onobrychis viciaefolia: hostendophyte specificity. Soil Biology and Biochemistry 17, 899900.
  • Giovanetti, M. & Mosse, B. (1980). An evaluation of techniques for measuring vesicular-arbuscular mycorrhizal infection in roots. New Phytologist 84, 489500.
  • Hargrove, W. L. (1985). Influence of tillage on nutrient uptake and yield of corn. Agronomy Journal 77, 763768.
  • Hayman, D. S. (1982). The physiology of vesicular arbuscular endomycorrhizal symbiosis. Canadian Journal of Botany 61, 944963.
  • Isaac, R. A. & Kerber, J. D. (1971 (Atomic absorption and flame photometry: Techniques and uses in soil, plant and water analysis. In: Instrumental Methods for Analysis of Soils and Plant Tissue Ed. by L. M.Walsh), pp. 1738. Soil Society of America, Madison , Wisconsin .
  • Jalali, B. L. & Domsch, K. H. (1975 (Effect of systemic fungitoxicants on the development of endotrophic mycorrhiza. In: Endomycorrhizas (Ed. by E.E.Sanders, B.Mosse & P. B. H.Tinker), pp. 619626. Academic Press, New York .
  • Jensen, A. (1982). Influence of four vesicular-arbuscular mycorrhizal fungi on nutrient uptake and growth in barley. (Hordeum vuigare). New Phytologist 90, 4550.
  • Lambert, D. H., Baker, D. E. & Cole, H. JR. (1979). The role of mycorrhizae in the interactions of phosphorus with zinc copper and other elements. Sail Science Society of America Journal 43, 976980.
  • Lindsay, W. L. & Norveli, W. A. (1978). Development of a Dtpa soil test for zinc, iron, manganese and copper. Soil Science Society of America Journal 42, 421428.
  • Menge, J. A. (1982). Effect of soil fumigants and fungicides on vesicular arbuscular fungi. Phytopathology 72, 11251132.
  • Olsen, S. R. & Sommers, L. E. (1982 (Phosphorus. In: Methods of Soil Analysis. Part 2. Chemical and Microbiological Properties, 2nd Ed. (Ed. by A. L.Page), no. 9, (part 2), in the series Agronomy, pp. 403430. Soil Science Society of America, Madison , Wisconsin .
  • O'Halloran, I. P., Miller, M.H. & Arnold, G. (1986). Absorption of P by corn (Zea mays L.) as influenced by soil disturbance. Canadian Journal of Soil Science 66, 287302.
  • Singh, T. A., Thomas, G. W., Moschler, W. W. & Martens, D. C. (1966). Phosphorus uptake by corn (Zea mays L.) under no-tillage and conventional practises. Agronomy Journal 58, 147148.
  • Sutton, J. C. & Sheppard, B. R. (1976). Aggregation of sand-dune soil by endomycorrhizal fungi. Canadian Journal of Botany 54, 326333.
  • Tennant, D. (1975). A test of a modified line intersect method of estimatiiiK root length. Journal of Ecology 63, 9951001.
  • Thomas, R. L., Sheard, R. W. & Moyer, J. R. (1967). Comparison of conventional and automated procedures for nitrogen, phosphorus and potassium analysis of plant material using a single digest. Agronomy Journal 59, 240243.
  • Triplett, G. B. JR. & Van Doran, D. M., Jr (1969). Nitrogen, phosphorus and potossium fertilization of non-tilled maize. Agronomy Journal 61, 637639.