Abstract
SummaryA long-term field experiment testing the effects of 4 soil management treatments and 4 levels of ammonium sulphate on Washington Navel and Late Valencia oranges, budded on rough lemon or sweet orange rootstocks, was terminated in 1965. At this stage the difference in crop yield between the worst and best treatments was about 150%; average annual yields for the 4-year period 1962–65 varied from 18.3 to 46.2 t/ha according to treatment. After 1965 remedial N and Ca treatments were applied to restore the experimental area to a uniformly high level of productivity.For the 2-year period 1968–69, average annual yields from plots previously receiving the 4 ammonium sulphate treatments varied from 39.1 to 44.6 t/ha; uniformity in terms of yield had thus largely been achieved. Slightly less success, however, was achieved in terms of fruit quality.Lime, applied to counteract soil acidity induced by the previous ammonium sulphate treatments, produced greater responses on tilled plots than on non-tilled plots....
Published Version
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