1. Haworth, F. (1964). A fertility-spacing-irrigation-variety experiment.Rep. nat. Veg. Res. Sta. Wellesbourne for 1963, 32.
2. Janes, B. E. (1951). Composition of Florida-grown vegetables. III. Effects of location, season, fertilizer level and soil moisture on the mineral composition of cabbage, bean, collards, broccoli and carrots.Florida Agr. Exp. Sta., Bull. 488.
3. Wallace, T., Croxall, H. E., and Pickford, P. T. H. (1941a). Manurial experiments on vegetable crops. I. Effects of farmyard manure and of various- fertilizer treatments on savoys and carrots.Rep. Long Ashton Res. Sta., Bristol, for 1941, 25–31.
4. Wallace, T., Jones, J. O., and Plant, W. (19416). A note on the effects of farmyard, manure and of various fertilizer treatments on the content of ash and mineral constituents of ash in the carrot crop.Rep. Long Ashton Res. Sta., Bristolvfor 1941, 40–4.